HomeMy WebLinkAbout830384.tiff AR1929393 ORDINANCE NO. 108
PERMIT NO. 7,3
PERMIT FOR PLOWING GRASSLAND
APPLICANT NAME: Harold Sidwell
ADDRESS: 54286 WCR #27 Few
Carr, CO 80612 Z ;;
I= Pi
JKGAL DESCRIPTION OF PROPERTY TO BE CULTIVATED (Map delineating
MIA
' the proposed land use change attached) :
Pt. Si Section 6 - T8N - R64W
Pt. NZ Section 7 - T8N - R64W
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APPROVED SOIL CONSERVATION PLAN ATTACHED. Yes
PERMIT ISSUED BY THE CLERK TO THE BOARD OF COUNTY COMMISSIONERS
OF WELD COUNTY, COLORADO. T
headf- yJ TQto £
ideell-atc �4'��
Weld unty Clerk & Recorder
Lando ner and Clerk to the Board
0, 2
d ' B ' - A-1
r Dep ty County Cler
This permit is issued pursuant to Weld County Ordinance No . 108
adopted by the Weld County Board of County Commissioners
on May 19, 1982 , and requiring the issuance of permits for
the plowout and cultivation of grassland. Pursuant to Ordi-
nance No. 108 , the landowner is required to follow a conserva-
tion plan approved by the local Conservation District Board.
The landowner is advised to contact the local Soil Conserva-
tion District Board for any amendments or updates to the
Conservation Plan .
830384
RECORDER'S MEMORANDUM
AT THE TIME OF RECORDATION, THIS IN-
STRUMENT WAS FOUND TO BE INADEQUATE
FOR THE BEST PHOTOGRAPHIC REPRODUCTION
BECAUSE OF ILLEGIBILITY, CARBON OR PUOT9
' COPY, DISCOLORED PAPER, ETC. +
A/Township_--fN.•!Y!---- . , Range . 64/ , County.__II/
4 b _ _.__.,State__az.o.e/5z -,
ORDINANCE NO. 108
PERMIT NO. s",..1 -/ 7
A3 0990 RE5.. 01929393 06/07/03 10149 $0 e 00 2/027
F 1723 MARY ANN F•EUE:R TE:[N t: I...FRK 8, RECORDER WELD CO, CO
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FORM 50 F
/;eld County, Colorado, Northern Part 39
'tse on this unit are proper range use, deferred grazing, and rotation grazing. If the plant cover is disturbed,
.nd rotation grazing. If the plant cover is disturbed, protection from erosion is needed. Loss of the surface
rotection from erosion is needed. Loss of the surface layer results in a severe decrease in productivity and in
ayer results in a severe decrease in productivity and in the potential of the soil to produce plants suitable for
the potential of the soil to produce plants suitable for grazing.
grazing. This unit is well suited to windbreaks and -
This unit is suited to winter wheat, barley, oats, and environmental plantings. Supplemental irrigation may be
sorghum. Because precipitation is not sufficient for needed when planting and during dry periods. •-•J Ne
annual cropping, a cropping system that includes small This map unit is in capability subclass Vle, ct 4:
grain and summer fallow is most suitable. Precipitation nonirrigated, and in Loamy Plains range site. 0 u
isually is too low for crops on this unit to make efficient a
7.3
Ise of fertilizer. 57—Renohill-Shingle complex, 3 to 9 percent - 'M'
Maintaining crop residue on or near the surface slopes. This map unit is on moderately dissected to
educes runoff, reduces soil blowing, and helps to highly dissected plains, upland ridges, and breaks. 4
maintain soil tilth and organic matter content. Stubble- This unit is.50 percent Renohill fine sandy loam and z w
mulch farming, striperopping, and minimum tillage help to 35 percent Shingle clay loam. The Renohill soil is in the z '';
control erosion and conserve moisture. Terraces reduce less sloping, slightly concave areas, and the Shingle soil -n w
runoff and the risk of erosion and help to conserve is in the steeper, convex areas. ` -0
CC c
moisture. Included in this unit are small areas of Midway and rn
This unit is well suited to windbreaks and Tassel soils. Also included are some areas of Rock ,V
environmental plantings. Supplemental irrigation may be outcrop. Included areas make up 15 percent of the total -+
needed when planting and during dry periods. acreage. ''' c
This map unit is in capability subclass IVe, The Renohill soil is moderately deep and well drained. Z
nonirrigated, and in Loamy Plains range site. It formed in calcareous loamy or clayey residuum derived
dominantly from shale. Typically, the surface layer is H th
56—Renohill fine sandy loam, 6 to 9 percent brown fine sandy loam 4 inches thick. The subsoil is clay "'
slopes. This moderately deep, well drained soil is on loam 13 inches thick. The substratum is calcareous clay z ->
moderately dissected to highly dissected plains. It loam 12 inches thick. Shale is at a depth of 29 inches. 9 '••
formed in calcareous loamy or clayey residuum derived Depth to shale ranges from 20 to 40 inches. x1.
dominantly from shale. Permeability of the Renohill soil is slow. Available water ;; '`11
Typically, the surface layer is brown fine sandy loam 4 capacity is moderate. Effective rooting depth is 20 to 40 ri
inches thick. The subsoil is clay loam 13 inches thick. inches. Runoff is medium, and the hazard of water erosion
The substratum is calcareous clay loam 12 inches thick. is moderate. The hazard of soil blowing is moderate to U
Shale is at a depth of 29 inches. Depth to shale ranges high. M v
from 20 to 40 inches. In some areas the surface layer is The Shingle soil is shallow and well drained. It formed
loam. in calcareous loamy or clayey residuum derived m c
Included in this unit are small areas of Midway clay dominantly from shale. Typically, the surface layer is —
loam, Shingle loam, and Rock outcrop of shale. yellowish brown clay loam 4 inches thick. The underlying
Permeability of this Renohill soil is slow. Available material is clay loam 7 inches thick. Shale is at a depth
water capacity is moderate. Effective rooting depth is 20 of 11 inches. Depth to shale ranges from 10 to 20 c
to 40 inches. Runoff is medium, and the hazard of water inches. The soil is calcareous throughout.
erosion is moderate. The hazard of soil blowing is high. Permeability of the Shingle soil is moderate. Available 2 '"
This unit is used as rangeland. water capacity is low. Effective rooting depth is 10 to 20
The potential plant community on this unit is mainly inches. Runoff is medium to rapid, and the hazard of
nlue grama, western wheatgrass, sedges, and water erosion is moderate. The hazard of soil blowing is
ouffalograss. The average annual production of air-dry slight.
vegetation ranges from 400 to 1,300 pounds. This unit is used as rangeland.
If the range is overgrazed, the proportion of preferred The potential plant community on the Renohill soil is
forage plants decreases and the proportion of less mainly blue grama, western wheatgrass, sedges, and
preferred forage plants increases. Therefore, livestock buffalograss. The average annual production of air-dry
grazing should be managed so that the desired balance vegetation ranges from 400 to 1,400 pounds. The
of preferred species is maintained in the plant potential plant community on the Shingle soil is mainly
community. western wheatgrass, blue grama, alkali sacaton, and
Range seeding is suitable if the range is in poor sideoats grama. The average annual production of air-
condition. The plants selected for seeding should meet dry vegetation ranges from 300 to 900 pounds.
the seasonal requirements of livestock or wildlife, or If the range is overgrazed, the proportion of preferred
both. Other management practices that are suitable for forage plants decreases and the proportion of less
use on this unit are proper range use, deferred grazing, preferred forage plants increases. Therefore, livestock
40 Soil sane
P 0990 REC', 0192939;3 06/07/03 10 : 49 *0.00 10/027
P'" 1731 MARY ANN r:E:a.JERSTIE:I:N CLERK & RECORDER WELD CO, CO
grazing should be managed so that the desired balance If the range is overgrazed, the proportion of preferred
of preferred species is maintained in the plant forage plants decreases and the proportion of less
community. preferred forage plants increases. Therefore, livestock
Range seeding is suitable if the range is in poor grazing should be managed so that the desired balance
condition. The plants selected for seeding should meet of preferred species is maintained in the plant
the seasonal requirements of livestock or wildlife, or community.
both. Other management practices that are suitable for Range seeding is suitable if the range is in poor
use on this unit are proper range use, deferred grazing, condition. The plants selected for seeding should meet
and rotation grazing. If the plant cover is disturbed, the seasonal requirements of livestock or wildlife, or
protection from erosion is needed. Loss of the surface both. Other management practices that are suitable for
layer results in a severe decrease in productivity and in use on this unit are proper range use, deferred grazing,
the potential of the soils in this unit to produce plants and rotation grazing. If the plant cover is disturbed,
suitable for grazing. protection from erosion is needed. Loss of the surface
The Renohill soil is well suited to windbreaks and layer results in a severe decrease in productivity and in
environmental plantings. The Shingle soil is poorly suited the potential of the soil to produce plants suitable for
to windbreaks and environmental plantings. The main grazing.
limitations are shallow rooting depth and low available This unit is well suited to windbreaks and
water capacity. environmental plantings. Supplemental irrigation may be
This map unit is in capability subclass Vle, needed when planting and during dry periods.
nonirrigated. The Renohill soil is in Loamy Plains range This map unit is in capability subclass IVe,
site, and the Shingle soil is in Shaly Plains range site. nonirrigated, and in Loamy Plains range site.
58—Rosebud fine sandy loam, 0 to 6 percent 59—Rosebud fine sandy loam, 6 to 9 percent
slopes. This moderately deep, well drained soil is on slopes. This moderately deep, well drained soil is on
moderately dissected high plains. It formed in calcareous highly dissected high plains. It formed in calcareous
loamy residuum derived dominantly from sandstone. loamy residuum derived dominantly from soft sandstone
Typically, the surface layer is dark grayish brown fine Typically, the surface layer is dark grayish brown fine
sandy loam 5 inches thick. The subsoil is clay loam 14 sandy loam 4 inches thick. The subsoil is clay loam 12
inches thick. The substratum is sandy clay loam and inches thick. The substratum is sandy clay loam and
sandy loam 19 inches thick over limy sandstone. sandy loam 12 inches thick. Limy sandstone is at a dept
Sandstone is at a depth of 38 inches. Depth to of 28 inches. Depth to sandstone ranges from 20 to 40
sandstone ranges from 20 to 40 inches. inches.
Included in this unit are small areas of Ascalon fine Included in this unit are small areas of Ascalon fine
sandy loam and Platner loam. sandy loam. Also included are some areas of Rock
Permeability of this Rosebud soil is moderate. outcrop.
Available water capacity is moderate. Effective rooting Permeability of this Rosebud soil is moderate..
depth is 20 to.40 inches. Runoff is medium, and the Available water capacity is moderate. Effective rooting
hazard of water erosion is slight to moderate.The hazard depth is 20 to 40 inches. Runoff is medium to rapid, any
of soil blowing is moderate. the hazard of water erosion is high. The hazard of soil
This unit is used as nonirrigated cropland and blowing is moderate.
rangeland. Winter wheat is the main crop. This unit is used as rangeland.
This unit is well suited to winter wheat, barley, oats, The potential plant community on this unit is mainly
and sorghum. Because precipitation is not sufficient for blue grama, western wheatgrass, sedges, and
annual cropping, a cropping system that includes small buffalograss. The average annual production of air-dry
grain and summer fallow is most suitable. Precipitation vegetation ranges from 500 to 1,400 pounds.
usually is too low for crops on this unit to make efficient If the range is overgrazed, the proportion of preferred
use of fertilizer. forage plants decreases and the proportion of less
Maintaining crop residue on or near the surface preferred forage plants increases. Therefore, livestock
reduces runoff, reduces soil blowing, and helps to grazing should be managed so that the desired balance
maintain soil tilth and organic matter content. Stubble- of preferred species is maintained in the plant
mulch farming, striperopping, and minimum tillage help to community.
control erosion and conserve moisture. Terraces reduce Range seeding is suitable if the range is in poor
runoff and the risk of erosion and help to conserve condition. The plants selected for seeding should meet
moisture. the seasonal requirements of livestock or wildlife, or bot
The potential plant community on this unit is mainly Other management practices that are suitable for use c
blue grama, western wheatgrass, sedges, and this unit are proper range use, deferred grazing, and
buffalograss. The average annual production of air-dry rotation grazing. If the plant cover is disturbed, protect
vegetation ranges from.600 to 1,600 pounds. from erosion is needed. Loss of the surface layer result
.
r,;r/8:3 1 0 : .q.49 $0,00 /027
CLERK & RECORDER WELD CO , C;f:} co cc
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West Greeley Soil Conservation District _
P.O. Box 86 - Greeley,Colorado 80632
A
RESOURCE OR LAND USE PLAN REVIEW
APPLICANT PROPERTY OWNER z
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Name: Harold Sidwell Name: SAME (Harold Sidwell) r ,0
Address: 54286 Weld Co. Rd. 27 Address: t:
Carr, CO 80612 ti-3
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DATE OF REVIEW: May 9, 1983
ACREAGE BY LAND USE IN CONSERVATION PLAN: ^.
240 ac. of grassland to be converted to non-irrigated cropland. '' •'c'
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LEGAL DESCRIPTION OF PROPERTY TO BE CULTIVATED: (Map delineating the proposed land use 1,2-7 °
change attached) Cs
Pt. Sz Section 6-T8N-R64W
Pt. NZ Section 7-T8N-R64W
PLAN DISPOSITION: Conservation plan approved as presented.
COMMENTS,;,
,.'A Sole
'�0/STR1Gi
• > WEST GREELEY SOIL CONSERVATION DISTRICT BOARD
CONSERVATION - DEVELOPMENT - SELF GOVERNMENT (Rev. 4/83)
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I° 1737 MARY FINN II:::UE::RSTEIN (::I...I:i:RK & RECORDER WELD CO, CO
INSTRUCTIONS
PLANNING AND APPLICATION RECORD
FOR STUBBLE MULCHING
Field Number or Name-Field designation as shown on the Conservation Plan Map.
Acres-From the Conservation Plan Map.
Soil of Major Hazard-The major soil of the field, or the soil of greatest hazard if it is more
significant to the field than the major soil.
Wind Erodibility Soil Group (WEG)-Determined by soils from Guide for Determining Adequate
Wind Erosion Control Systems (Guide) for the Work Unit or County location of the field.
Width of Exposure-The furthest distance the prevailing wind travels over the vulnerable part
of the field.
Specifications-Determined by use of appropriate Soil Loss tables from the Guide. This is
determined in pounds of flat small grain residue equivalent. (If crops other than small
grains are grown, this figure must be converted to the grown crop by use of the Chart
to Determine the Amount of Residue of Various Crops Needed to Equal a Given Amount
of Flat Small Grain Stubble from the Guide.)
Application-This becomes a record by years of each field at planting time, or other appropriate
time such as the late fall when new growth has reached its maximum before going dor-
mant for the winter. Enter the amount of all residues on the soil surface, whether
fallowed or tilled, or of stubble standing from the previous crop. This should be con-
verted to flat small grain stubble equivalent. If a part of a field is cropped and the
remainder is fallowed, residue amounts should be entered from both areas.
UNITED STATES DEPARTMENT OF AGRICULTURE Technical Guide
Soil Conservation Service Section IV
Colorado All Field Offices
February 1982
- T
STANDARDS AND SPECIFICATION
ti ••4.-;
CONSERVATION TILLAGE SYSTEM (Acre) 329
Standard ! P'
1 m
2 ;J
Definition
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A form of noniversion tillage that 1 . Zero tillage, slot planting or _ w
retains protective amounts of residue no-till.
mulch on the surface throughout the v 04
year. These include no-tillage, strip This is a method planting into 7.7
tillage, minimum tillage and other prior crop residue by disturb-
types of noninversion tillage. ing only the immediate area of T
the row. Crop residue is left z ti
Purpose on the surface for erosion m co
control. — 'h
To protect the soil from erosion and
help maintain or develop good soil 2. Strip tillage. z u
tilth, and desirable water infiltra- 2'
tion rates and water storage. Tillage operations for seedbed z
preparation are limited to a
A"'
Conditions where practice applies strip not to exceed one-third
A T:
of the distance between rows.
On cropland and on certain other A protective cover of crop
„ F
lands where annual vegetation is residue remains on the E
grown. balance. Tillage and planting "m 0
are accomplished in the same
Planning considerations operation. r u
Conservation tillage provides a pro- 3. Minimum Tillage
duction system that leaves crop resi-
dues on the surface after planting. Limiting the number of tillage
Crop residues are left standing as operations to those essential
long as possible prior to the succeed- to control weeds, improve soil
ing crop to trap blowing snow. Herbi- aeration, permeability and
cides are used immediately following tilth. Sweeps, rod weeders or
harvest, prior to and during planting, straight shank chisel imple-
to control volunteer grain and other ments will be used.
vegetation.
Specifications
This practice is most effective when
carried out in conjunction with other A. The primary objective is to
practices such as strip cropping, accomplish weed control with
terracing and contour farming. no tillage or with a limited
• number of conservation tillage
One of the following conservation operations, so that adequate
tillage systems should be used: amounts of crop residue can be
maintained for protection from
erosion.
TGN #182 2/82
329-2-Conservation Tillage System
3 B. The minimum amount of crop residue left on the soil surface after
planting shall be 1 ,500 pounds per acre of corn or sorghum residue, or
500 pounds per acre of flat small grain residue or its equivalent.
C. Soil loss by water and wind shall be reduced to the loss tolerance
established for that soil. The Universal Soil Loss Equation and the
Wind Erosion formula can be used to arrive at the amount of residue necessary to keep the soil loss within limits. -A
Table 1 - A Guide for Estimating Residue Reduction from Tillage Operations ',De)
Approximate Percent of j; '
Residue Reduction After
One Trip or Pass Over -<
Tillage Operation the Field =,
Rod Weeder 10
Sweeps (30" or more) 10 :r {
Rod Weeder and Semichisel 15
Field Cultivator - ( 16-18 inch sweeps) 25
Till Planter 20 -?
m 1,
Chisel Plow (straight shanks) 20 :y
Chisel Plow (twisted shank) 50 z
One-Way or Tandem Disc 507 04
a:
Moldboard Plow 75-100
rr
D. On systems where tillage operations are permitted:
1. Subsurface tillage equipment should be used to keep the residue on
the soil surface. r,
T
2. On soils that tend to crust, or with some slope to them, a chisel r
type implement may need to be used after harvest to increase water
T T
infiltration and reduce soil loss due to runoff.
3. Chemicals may be used to aid in reducing or eliminating tillage
operations. Use manufacturers labels or Colorado Weed Control
Handbook for specific rate recommendations. The following options
are recommended. l "�
a. Fall sweep (4 inches deep) plus Atrazine. Fall sweep
immediately (within two weeks) after wheat harvest to kill
existing vegetation. Atrazine applied immediately following
fall sweep will kill volunteer wheat and weeds until the next
summer. Limit summer tillage operations prior to planting.
b. Apply a combination of non-selective contact or non-residual
herbicides (such as Paraquat or Roundup) plus Atrazine to kill
existing weeds and for long-term weed control. Limit summer
tillage operations.
-.416)
TGN #182 2/82
Conservation Tillage System 329-3
pis
c. Contact herbicide plus Bladex, Igran or other short residual
(45-60 days) may be used for spring application to eliminate
early spring and early summer tillage. Limit summer tillage
operations.
d. 2-4D Butyl Ester plus atrazine or a short residual triazine is
an economical alternative if approximately 90% of the fall weeds
are broadleaf. Limit summer tillage operations. ^ x
-71
E. For no-till systems:
1. Conventional tillage operations will not be used to control volun-
teer crop growth or annual forbs and grasses. On soils with a heavy z
clay or silty surface that tend to seal, a light crust breaking may .G
be needed using sweeps or a chisel using straight shanks. H
r
a. Wheat-fallow (chemical only) - Use of chemicals to eliminate J
tillage operations. The following is required:
(1) Contact herbicides, such as Paraquat or Roundup, plus z ;\
atrazine or residual and tank mixes such as atrazine-Bladex n o
and atrazine-Igran shall he applied immediately following —
harvest to kill existing weeds and give Long-term weed _—
control.
.,.,_ ••
(2) A short residual herbicide may be used Eor spring applica-
tion if necessary to control weeds to substitute for
tillage operations normally used.
C
ce
(3) A slot or no-till planter or grain drill shall be used that �: 0
will disturb not more than 25% of the soil surface. z v
_- o
b. Corn, sorghum, and small grains (chemical only) . Use of chemi-
cals to eliminate tillage operations in irrigated cropland or
annual cropping systems. The following is required: .43
(1) A contact herbicide plus Bladex, Igran or other short
residual (45-60 days) may be used for spring application if
needed to control weeds to eliminate early spring and early
summer tillage.
(2) A slot or no-till planter or adequate grain drill shall be
used that will disturb not more than 25% of the soil
surface.
(3) Atrazine may be used in a wheat-sorghum-fallow or a wheat-
corn-fallow sequence.
F. Farmers must be made aware of the hazards involved in using residual
herbicides.
TCN Ii182 2/82
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329-4—Conservation Tillage System
1 . Caution must be exercised in use of atrazine on soils with a pH of
7.5 or higher.
2. Caution should be taken when applying long residual herbicides
annually so no overlap or carry—over effect of chemical occurs.
3. A minimum of 20 gallons of water, preferably 30, will be needed to
get adequate coverage of chemical.
4. For more uniform application, large volume sprayers with wide stable
boom coverage are preferred over small units with narrow coverage.
The wider swath should result in fewer overlaps or skips. Dust
should be held to a minimum as it deactivates some herbicides.
Nozzle spacing should not be greater than 40 inches for uniform
distribution.
G. Specific chemical recommendations shall be in accordance with container
labels and/or Colorado Weed Control Handbook.
Trade names were used in this standard only to make the information more
understandable. This does not imply endorsement of certain products or
criticism of products not named or mentioned.
•� 1
TGN #1.82 2/82
UNITED STATES DEPARTMENT OF AGRICULTURE Technical Guide
m , Soil Conservation Service Section IV
Colorado All Field Offices
October 1981
STANDARDS AND SPECIFICATIONS
CROP RESIDUE USE - (ac.) 344
Definition B. Each field will be evaluated for
potential wind and water erosion r'i `='
Using plant residues to protect using the Wind Erosion Curves and a r
cultivated fields during critical the Universal Soil Loss Equation. - r
erosion periods. <: "
a
C. If only one of the erosion -
Purpose hazards (wind or water) is signifi- z r
cant, the land treatment will be o
To conserve soil moisture, increase planned so that erosion from neither T ;
soil infiltration, reduce soil loss, wind nor water will exceed the — '
and improve soil tilth. designated "T" value for that soil.
Condition where practice applies D. If both wind and water erosion
are significant in a given field,
On land where crop residues are land treatment shall be planned so ': 7i
produced. that the total soil loss from wind
and water does not exceed the desig- —
Specifications nated "T" value.
I. Non-Irrigated Small Grain - Use E. If the treatment is planned toDr: NC
the "Guide for Wind Erosion Control control wind erosion the technician 9
o
on Cropland" or Agronomy Note #53 will record (1) the amount of —
for guidance on amounts of residue residue required on the soil surface , , *
required on the soil surface during at planting time, (2) the unshel—
the critical wind erosion season. tered distance usually described as s
This will normally be considered as field width perpendicular to the -
the amount of flat small grain prevailing winds, (3) ridge rough—
stubble equivalent residue after the ness factor, i.e. , unridged. ^} '
planting operation. y
F. If the treatment is planned
or.;
r.;
A. To calculate residue require- primarily to control water erosion,
ments, average the annual soil loss the technician will develop alterna-
for the entire rotation or wheat- tives in accordance with the
fallow cropping system. This method Universal Soil Loss Equation for (1)
will show the benefits of residue length of slope (2) cropping
management for the entire cropping management factor and (3) erosion
system. If this method is used the control practice factor.
wind erosion curves will determine
the amount of residue needed but in
no case will the minimum requirement
be less than 500 lbs. per acre of
flat small grain stubble equivalent
�. at planting time.
IL
TGN 11178
344-2 Crop Residue Use
G. Planning Considerations
1 . Subsurface tillage equipment such as sweeps, blades and
o rodweeders should be used for most tillage operations.
2. Chemical weed control to reduce the number of tillage operations
is beneficial in managing the residue.
c r:
3. Reducing field widths is an effective way to reduce the need for
a La large amounts of crop residue.
3
0 'C 4. When inadequate residue is produced the soil surface will be
ridged by chiseling or listing.
f
II. Non-Irrigated Sorghums
A. Pounds of residue required through the critical wind erosion period
(November-May).
re
N _ Minimun Required
Crop and Spacing
Residue
1. Drilled sorghums on row 750#
. spacing of 20" or less
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NJ J 2. Forage sorghum on
w 1000#
u 20" - 40" rows
z 3. Grain sorghum on 1500#
Q 20" - 40" rows
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When the above residue requirements are met, the practice will be considered
adequate to hold the soil loss to the acceptable "T" level.
o�
B. Planning Considerations
1 . The above amounts of residue will be left on the soil surface
through May or until spring seedbed preparation which usually
occurs in early April. Spring seedbed preparation should result
in a ridged surface for wind erosion protection.
2. When inadequate residue is produced the soil surface will be
ridged by chiseling or listing. Soils coarser than sandy loam
usually require listing to provide satisfactory surface
roughness.
3. Grazing will be restricted on machine harvested crops when
marginal amounts of residue are produced.
USDA/SCS/Colorado/ 10/81 TGN #178
1
Crop Residue Use 344-3
III. Irrigated Crops
A. The pounds of residue required on the soil surface during the
critical erosion period are as follows.
Wind Erodibility Drilled Crops
Groups 20" rows or less Row Crops z .73
c,
1 & 2 1500 2500
3 & 4 1000 1750 ?>
5, 6 & 7 750 1000 z ,v
B. Critical Erosion Periods (Modified for Necessary tillage) "
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1. W.E.G. 's 1&2 Sprinkler Irrigated — Maintain the required amounts
of residue until the planted crop has enough growth to protect msa-
the soil. 0
2. Gravity Irrigated Row Crops — Maintain the required amounts of
residue as long as feasible after harvest. The cropping system .33
T
and method of irrigation are to be considered. If fall plowing
destroys the residue, the field will be left rough and cloddy 0
until spring seedbed preparation, (about March 1st as a
minimum). r w
0
C
•
TGN #178 USDA/SCS/COLORADO/ 10/81
UNITED STATES DEPARTMENT OF AGRICULTURE Technical Guide
Soil Conservation Service Section IV
Colorado All Field Offices
March 1983
STANDARDS AND SPECIFICATION
STRIPCROPPING, WIND (Code 589) T
B. Strips will run approxi-
Standard T
mately perpendicular to
the prevailing wind j
Definition direction.
Growing wind-resisting crops in C. Maximum Strip Widths 7
strips alternating with row crops (narrower strips provide
or fallow and arranged at angles g g better protection and
to offset adverse wind effects. require less protective
cover) .
Purpose
1. 0-2% slope, 660 feet —
To reduce wind velocity at the widths (40 rods) .
soil surface, thereby reducing
soil blowing and damage to crops. 2. 2-5% slope, 330 feet r34
To trap snow and increase stored widths (20 rods) .
soil moisture.
`j Where applicable 3. 5% or greater slope , 165
PP feet widths (10 rods) . r .o
On cropland subject to soil D. Wheat stubble in the
blowing and where needed as part protective strips will be ti
of a cropping system for snow left standing through the T ti
T C
catchment and moisture critical erosion period.
conservation. E
(Nov. through May) . M 0
Specifications p E. A minimum of SOON of _
residue will be left on "Js,
Follow guidance set forth in the soil surface after
"Guide for Wind Erosion Control planting for soils in
on Cropland in Great Plains WEG's 1 , 2 , 3 & 4. If the
States" (Revised 1976) , or Guide for Wind Erosion
Agronomy Technical Note #53, to Control or Technical Note
calculate widths of wind strips. #53 indicate larger
amounts are needed, then
I. Wheat—Fallow Systems those amounts should be
left on the surface after
A. Strips of wheat will be planting.
planted alternately with
the stubble from the
previous crop; in
approximately equal widths to facilitate
;. ', . rotation.
TGN #200
Striperopping, Wind 5b '-2
3/83 TGN #200
-2-
II. Annual Row Crop Systems Lt.,
A. Strips of high residue producing crops will be grown in alternate
strips with erosion susceptible crops. Strips will be approximately
perpendicular to the prevailing wind direction.
B. Width and spacing of protective strips:
1. Row Crop Plants — Minimum width of protective strips will be the
equivalent width of 4 rows spaced 40 inches apart. Spacing
between strips will not exceed 30 feet. a w
aco
2. Drilled Plants — Minimum width of protective strips will be two
rows (12" — 20" spacing) and the spacing between strips will not
exceed 30 feet.
C. The protective crop will be harvested with a combine or mowed leaving Z
the stubble 12 to 18 inches tall. The protective residue will be - 04
left on the soil surface through the critical wind erosion season T v'
(Nov—May) or until the seedbed is prepared for the following crop
which is expected to occur in early April. Spring seedbed % 0
preparation should result in a ridged surface for wind erosion =
protection. _ 0
Z
III. Perennial Tall Grass Barriers m iff4A
H ,,G,,ICt✓'
A. Only tall growing species such as tall wheatgrass , switchgrass , big T —
bluestem, sand bluestem, Basin wildrye and Indiangrass will be •
planted. Range site descriptions and Critical Area Planting
specifications will be used to determine specie adaptation. 4V
V
B. Seedbed preparation will consist of only those operations necessary
to assure a firm soil condition relatively free of weeds. Planting - e
in residue from a previous crop is acceptable. t''
C O
C. Colorado Agronomy Note No. 61 will be used to determine amounts of seed to plant.
D. Barriers shall consist of at least two rows of grass spaced .10-40 `*
inches apart as a minimum.
v, y
E. Optimum barrier spacing will be determined using the Guide for Wind
Erosion Control and will be designed as close to this optimum as
possible considering equipment widths .
F. Weed control will be practiced as needed to control competition until
grass is well established.
G. Barriers will be periodically mowed or clipped to a minimum height of
8-10 inches to encourage regrowth and prevent decadent stands from
developing.
UNITED STATES DEPARTMENT OF AGRICULTURE Technical Guide
Soil Conservation Service Section IV
Colorado All Field Offices
"4 March 1983
STANDARDS AND SPECIFICATION
STRIPCROPPING, CONTOUR (acre) (Code 585)
Standard
Definition Planning Considerations &'
Growing crops in a systematic Steepness of slope, soil factor , r =n
arrangement of strips or bands on the normal amount and intensity of
the contour to reduce water rainfall and the width of the farm W 0
erosion. The crops are arranged equipment are factors to consider z c
so that a strip of grass or in determining width of strips. '• '''
close—growing crop is alternated 7..-
with a strip of clean—tilled crop Generally, this practice must be .`
or fallow or a strip of grass is supplemented with other practices
alternated with a close—growing such as crop residue management or o
crop, conservation tillage. m
z -.1
Purpose Grassed waterways may be essential '*
. m
to control water erosion in areas - C.1
To reduce erosion and control of concentrated flow. 3;
water.
ciiitv) Grass buffer strips can be used in 2
.J Conditions where practice applies conjunction with the striperopping 3, c
system. The advantage of using ''
On sloping cropland and on certain grass buffer strips can be n
recreation and wildlife land where reflected by modifying the "P" o
the topography is uniform enough value used in the cropping system `' a
r c
to permit tilling and harvesting, by the following percentage: o
and where it is an essential part rn o
of a cropping system to
effectively reduce soil and water
• r.;
losses . ; p.
- N
O r.
o -
Land Slope Percent of Field in Grass Buffer Strips
Percent 10% 20% 30% 40% 50%
1 to 2 .55 .50 .40 .35 .30
3 to 8 .45 .40 .35 .30 .25
9 to 12 .55 .50 .40 .35 .30
13 to 16 .65 .55 .50 .40 .35
17 to 20 .70 .65 .55 .50 .40
21 to 25 .80 .70 .65 .55 .45
TGN #200
Striperopping, Contou_ 585-2 3/83
-2-
Specifications
Contour striperopping is using alternate strips of growing crops and residue
or fallow with the strips being laid out on the contour of the field.
1 . The Universal Soil Loss Equation as
q presented in Agronomy Technical Note � `o
#50 (revised) will be used to determine strip widths.
3: s:
2. Strip widths will not exceed 412 feet (25 rods) for slopes of 5% or less
or 330 feet (20 rods) exceeding 5%.
3. Contour strip boundaries are to be either level or laid on a grade not z
exceed 2 percent (2 feet per 100 feet) slope.
4. When grass buffer strips are used they will be planted according to the
Standards and Specifications for Pasture and Hayland Planting - Code 512. i c
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T.70 anNO
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TGN 1E200
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