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Wyoming

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Nutrient Recommendations for Wyoming Crops

The nutrient recommendations below come from University of Wyoming Cooperative Extension publications. For more details about crop nutrition, please see the complete publications.

University of Wyoming Cooperative Extension publications.
Irrigated crops 

Dryland crops


Irrigated Corn for Grain - 150 bu/Acre Yield Goal

Nitrogen

Fertilizer Rate Values (lb N/Acre) based on Percentage of Soil Organic Matter
Soil NO3-N Test (ppm)

Soil Organic Matter (%)
0 - 0.5
0.6 - 1.0
1.1 - 1.5
1.6 - 2.0
> 2.0
ppm
Fertilizer Rate (lb N/Acre)
0 - 6
255
245
235
225
215
7 - 12
225
215
205
195
185
13 - 18
195
185
175
165
155
19 - 24
165
155
145
135
125
25 - 30
135
125
115
105
95
31 - 36
105
95
85
75
65
37 - 42
75
65
55
45
35
43 - 48
45
35
25
0
0
> 48
0
0
0
0
0

Add or subtract 1.6 lbs N/bushel change in grain yield goal.

Phosphorus

Phosphorus Rates
Soil Phosphorus Test
(ppm)
Fertilizer Phosphorus
(lb P2O5/Acre)
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
0 - 6
80
100
125
7 - 14
45
65
90
15 - 22
0
30
55
> 22
0
0
0

Add or subtract 0 - 6 lbs P2O5/bushel change in grain yield goal.

Soil Classification

Soil Texture Descriptions
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
Sand, loamy sand, sandy loam
Silt, silt loam, loam, and sandy clay loam
Sandy clay, clay loam, silty clay loam, silty clay, clay

 

Irrigated Corn for Silage - 30 Tons/Acre Yield Goal

Nitrogen

Fertilizer Rates
Soil NO3-N Test
Soil Organic Matter (%)
0 - 0.5
0.6 - 1.0
1.1 - 1.5
1.6 - 2.0
> 2.0
ppm
Fertilizer Rate (lb N/Acre)
0 - 6
255
245
235
225
215
7 - 12
225
215
205
195
185
13 - 18
195
185
175
165
155
19 - 24
165
155
145
135
125
25 - 30
135
125
115
105
95
31 - 36
105
95
85
75
65
37 - 42
75
65
55
45
35
43 - 48
45
35
25
0
0
> 48
0
0
0
0
0

Add or subtract 9.0 lbs N/ton change in silage yield goal.

 

Phosphorus

Phosphorus Rates
Soil Phosphorus Test
(ppm)
Fertilizer Phosphorus
(lb P2O5/Acre)
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
0 - 6
80
100
125
7 - 14
45
65
90
15 - 22
0
30
55
> 22
0
0
0

Add or subtract 3.0 lbs P2O5/ton change in silage yield goal.

Soil Classification

Soil Texture Descriptions
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
Sand, loamy sand, sandy loam
Silt, silt loam, loam, and sandy clay loam
Sandy clay, clay loam, silty clay loam, silty clay, clay

 

Irrigated Sorghum for Silage - 30 Tons/Acre Yield Goal

Nitrogen

Fertilizer Rates
Soil NO3-N Test
Soil Organic Matter (%)
0 - 0.5
0.6 - 1.0
1.1 - 1.5
1.6 - 2.0
> 2.0
ppm
Fertilizer Rate (lb N/Acre)
0 - 6
255
245
235
225
215
7 - 12
225
215
205
195
185
13 - 18
195
185
175
165
155
19 - 24
165
155
145
135
125
25 - 30
135
125
115
105
95
31 - 36
105
95
85
75
65
37 - 42
75
65
55
45
35
43 - 48
45
35
25
0
0
> 48
0
0
0
0
0

Add or subtract 9 lbs N/ton change in silage yield goal.

Phosphorus

Phosphorus Rates
Soil Phosphorus Test
(ppm)
Fertilizer Phosphorus
(lb P2O5/Acre)
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
0 - 6
80
100
125
7 - 14
45
65
90
15 - 22
0
30
55
> 22
0
0
0

Add or subtract 3.0 lbs P2O5/ton change in silage yield goal.

Soil Classification

Soil Texture Descriptions
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
Sand, loamy sand, sandy loam
Silt, silt loam, loam, and sandy clay loam
Sandy clay, clay loam, silty clay loam, silty clay, clay

 

Irrigated Sudan/Hybrids for Silage - 30 Tons/Acre Yield Goal

Nitrogen

Fertilizer Rates
Soil NO3-N Test
Soil Organic Matter (%)
0 - 0.5
0.6 - 1.0
1.1 - 1.5
1.6 - 2.0
> 2.0
ppm
Fertilizer Rate (lb N/Acre)
0 - 6
255
245
235
225
215
7 - 12
225
215
205
195
185
13 - 18
195
185
175
165
155
19 - 24
165
155
145
135
125
25 - 30
135
125
115
105
95
31 - 36
105
95
85
75
65
37 - 42
75
65
55
45
35
43 - 48
45
35
25
0
0
> 48
0
0
0
0
0

Add or subtract 9 lbs N/ton change in silage yield goal.

Phosphorus

Phosphorus Rates
Soil Phosphorus Test
(ppm)
Fertilizer Phosphorus
(lb P2O5/Acre)
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
0 - 6
80
100
125
7 - 14
45
65
90
15 - 22
0
30
55
> 22
0
0
0

Add or subtract 3.0 lbs P2O5/ton change in silage yield goal.

Soil Classification

Soil Texture Descriptions
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
Sand, loamy sand, sandy loam
Silt, silt loam, loam, and sandy clay loam
Sandy clay, clay loam, silty clay loam, silty clay, clay

 

Irrigated Alfalfa, Clover, Birdsfoot Trefoil or Cicer Milkvetch
(New seedings only)

Nitrogen

Fertilizer Rates
Soil NO3-N Test
Fertilizer Rate
ppm
lb N/Acre
0 - 3
40
4 - 6
20
> 6
0

Do not adjust nitrogen rates for soil organic matter levels.

 

Irrigated Grass and/or Established Legumes - 6 Tons/Acre Yield Goal

Nitrogen

Fertilizer Rates
Soil NO3-N Test
(ppm)
Percent in Stand
Grass :
Legume
100:0
80:20
60:40
40:60
20:80
0:100
Fertilizer Rate (lb N/Acre)
0 - 6
  
250
200
150
100
50
0
7 - 12
  
230
180
130
80
30
0
13 - 18
  
210
160
110
60
0
0
19 - 24
  
190
140
90
40
0
0
25 - 30
  
170
120
70
20
0
0
31 - 36
  
150
100
50
0
0
0
37 - 42
  
130
80
30
0
0
0
43 - 48
  
110
60
0
0
0
0
49 - 54
  
90
40
0
0
0
0
55 - 60
  
70
20
0
0
0
0

Add or subtract 40.0 lbs N/ton change in hay yield goal.

Phosphorus

Phosphorus Rates
Soil Phosphorus Test
(ppm)
Percent in Stand
Grass :
Legume
100:0
80:20
60:40
40:60
20:80
0:100
Fertilizer Phosphorus (lb P2O5/Acre)
   
Coarse-textured Soils
0 - 6
  
55
60
65
70
75
80
7 - 14
  
20
25
30
35
40
45
15 - 22
  
0
0
0
0
0
0
> 22
  
0
0
0
0
0
0
   
Medium-textured Soils
0 - 6
  
75
80
85
90
95
100
7 - 14
  
40
45
50
55
60
65
15 - 22
  
0
0
0
20
25
30
> 22
  
0
0
0
0
0
0
   
Fine-textured Soils
0 - 6
  
100
105
110
115
120
125
7 - 14
  
65
70
75
80
85
90
15 - 22
  
30
35
40
45
50
55
> 22
  
0
0
0
0
0
25

Add or subtract 15.0 lb P2O5/ton change in hay yield goal.

Soil Classification

Soil Texture Descriptions
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
Sand, loamy sand, sandy loam
Silt, silt loam, loam, and sandy clay loam
Sandy clay, clay loam, silty clay loam, silty clay, clay

 

Irrigated Barley - 100 bu/Acre Yield Goal

Nitrogen

Fertilizer Rates
Soil NO3-N Test
Soil Organic Matter (%)
0 - 0.5
0.6 - 1.0
1.1 - 1.5
1.6 - 2.0
> 2.0
ppm
Fertilizer Rate (lb N/Acre)
0 - 6
140
130
120
110
100
7 - 12
120
110
100
90
80
13 - 18
100
90
80
70
70
19 - 24
80
70
60
50
40
25 - 30
60
50
40
30
0
31 - 36
40
30
0
0
0
> 36
0
0
0
0
0

Add or subtract 1.55 lbs N/bushel change in grain yield goal.

Phosphorus

Phosphorous Rates
Soil Phosphorus Test
(ppm)
Fertilizer Phosphorus
(lb P2O5/Acre)
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
0 - 6
20
40
65
7 - 14
0
20
45
15 - 22
0
0
25
> 22
0
0
0

Add or subtract 0.7 lbs P2O5/bushel change in grain yield goal.

Soil Classification

Soil Texture Descriptions
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
Sand, loamy sand, sandy loam
Silt, silt loam, loam, and sandy clay loam
Sandy clay, clay loam, silty clay loam, silty clay, clay

 

Irrigated Oats - 135 bu/Acre Yield Goal

Nitrogen

Fertilizer Rates
Soil NO3-N Test
Soil Organic Matter (%)
0 - 0.5
0.6 - 1.0
1.1 - 1.5
1.6 - 2.0
> 2.0
ppm
Fertilizer Rate (lb N/Acre)
0 - 6
140
130
120
110
100
7 - 12
120
110
100
90
80
13 - 18
100
90
80
70
70
19 - 24
80
70
60
50
40
25 - 30
60
50
40
30
0
31 - 36
40
30
0
0
0
> 36
0
0
0
0
0

Add or subtract 1.15 lbs N/bushel change in grain yield goal.

Phosphorus

Phosphorus Rates
Soil Phosphorus Test
(ppm)
Fertilizer Phosphorus
(lb P2O5/Acre)
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
0 - 6
20
40
65
7 - 14
0
20
45
15 - 22
0
0
25
> 22
0
0
0

Add or subtract 0.5 lbs P2O5/bushel change in grain yield goal.

Soil Classification

Soil Texture Descriptions
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
Sand, loamy sand, sandy loam
Silt, silt loam, loam, and sandy clay loam
Sandy clay, clay loam, silty clay loam, silty clay, clay

Irrigated Wheat - 90 bu/Acre Yield Goal

Nitrogen

Fertilizer Rates
Soil NO3-N Test
Soil Organic Matter (%)
0 - 0.5
0.6 - 1.0
1.1 - 1.5
1.6 - 2.0
> 2.0
ppm
Fertilizer Rate (lb N/Acre)
0 - 6
140
130
120
110
100
7 - 12
120
110
100
90
80
13 - 18
100
90
80
70
70
19 - 24
80
70
60
50
40
25 - 30
60
50
40
30
0
31 - 36
40
30
0
0
0
> 36
0
0
0
0
0

Add or subtract 1.72 lbs N/bushel change in grain yield goal.

Phosphorus

Phosphorous Rates
Soil Phosphorus Test
(ppm)
Fertilizer Phosphorus
(lb P2O5/Acre)
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
0 - 6
20
40
65
7 - 14
0
20
45
15 - 22
0
0
25
> 22
0
0
0

Add or subtract 1.0 lbs P2O5/bushel change in grain yield goal.

Soil Classification

Soil Texture Descriptions
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
Sand, loamy sand, sandy loam
Silt, silt loam, loam, and sandy clay loam
Sandy clay, clay loam, silty clay loam, silty clay, clay

 

Irrigated Dry Beans - 30 cwt./Acre Yield Goal

(Do not adjust nitrogen rates for soil organic matter levels)

Nitrogen

Fertilizer Rates
Soil NO3-N Test
(ppm)

Fertilizer Rate (lb N/Acre)

0 - 5

90

6 - 10

68

11 - 15

45

16 - 20

23

> 20

0

 

Phosphorus

Phosphorus Rates
Soil Phosphorus Test
(ppm)
Fertilizer Phosphorus
(lb P2O5/Acre)
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
0 - 6
45
65
90
7 - 14
0
30
55
15 - 22
0
0
20
> 22
0
0
0

Add or subtract 1.75 lbs P2O5/cwt. change in yield goal.

Soil Classification

Soil Texture Descriptions
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
Sand, loamy sand, sandy loam
Silt, silt loam, loam, and sandy clay loam
Sandy clay, clay loam, silty clay loam, silty clay, clay

 

Irrigated Potato - 350 cwt./Acre Yield Goal

Nitrogen

Fertilizer Rates
Soil NO3-N Test
Soil Organic Matter (%)
0 - 0.5
0.6 - 1.0
1.1 - 1.5
1.6 - 2.0
> 2.0
ppm
Fertilizer Rate (lb N/Acre)
0 - 18
160
150
140
130
120
19 - 24
150
140
130
120
110
25 - 30
140
130
120
110
100
31 - 36
130
120
110
100
90
37 - 42
120
110
100
90
80
43 - 48
110
100
90
80
70
> 48
100
90
80
70
60

Add or subtract 0.5 lbs N/cwt. change in yield goal.

Phosphorus

Phosphorus Rates
Soil Phosphorus Test
(ppm)
Fertilizer Phosphorus
(lb P2O5/Acre)
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
0 - 6
60
80
105
7 - 14
30
50
75
15 - 22
0
20
45
> 22
0
0
0

Add or subtract 0.2 lbs P2O5/cwt. change in yield goal.

Soil Classification

Soil Texture Descriptions
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
Sand, loamy sand, sandy loam
Silt, silt loam, loam, and sandy clay loam
Sandy clay, clay loam, silty clay loam, silty clay, clay

 

Irrigated Sugarbeet - 30 tons/Acre Yield Goal

Nitrogen

Fertilizer Rates
Soil NO3-N Test
Soil Organic Matter (%)
0 - 0.5
0.6 - 1.0
1.1 - 1.5
1.6 - 2.0
> 2.0
ppm
Fertilizer Rate (lb N/Acre)
0 - 6
255
245
235
225
215
7 - 12
215
205
195
185
175
13 - 18
175
165
155
145
135
19 - 24
135
125
115
105
95
25 - 30
95
85
75
65
55
> 30
55
45
35
25
0

Add or subtract 9.0 lbs N/ton change in yield goal.

Phosphorus

Phosphorus Rates
Soil Phosphorus Test
(ppm)
Fertilizer Phosphorus
(lb P2O5/Acre)
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
0 - 6
90
110
135
7 - 14
60
80
105
15 - 22
30
50
75
> 22
0
20
45

Add or subtract 3.0 lbs P2O5/ton change in yield goal.

Soil Classification

Soil Texture Descriptions
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
Sand, loamy sand, sandy loam
Silt, silt loam, loam, and sandy clay loam
Sandy clay, clay loam, silty clay loam, silty clay, clay

 

Irrigated Sunflower - 30 cwt./Acre Yield Goal

Nitrogen

Fertilizer Rates
Soil NO3-N Test
Soil Organic Matter (%)
0 - 0.5
0.6 - 1.0
1.1 - 1.5
1.6 - 2.0
> 2.0
ppm
Fertilizer Rate (lb N/Acre)
0 - 6
165
155
145
135
125
7 - 12
145
135
125
115
105
13 - 18
125
115
105
95
85
19 - 24
105
95
85
75
65
25 - 30
85
75
65
55
45
31 - 36
65
55
45
35
25
37 - 42
45
35
25
0
0
43 - 48
25
0
0
0
0
> 48
0
0
0
0
0

Add or subtract 6.0 lbs N/cwt. change in yield goal.

Phosphorus

Phosphorus Rates
Soil Phosphorus Test
(ppm)
Fertilizer Phosphorus
(lb P2O5/Acre)
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
0 - 6
55
75
100
7 - 14
35
55
80
15 - 22
0
35
60
> 22
0
0
40

Add or subtract 2.0 lbs P2O5/cwt. change in yield goal.

 

Textured Soils
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
Sand, loamy sand, sandy loam
Silt, silt loam, loam, and sandy clay loam
Sandy clay, clay loam, silty clay loam, silty clay, clay

 

Dryland Barley - 33 bu/Acre Yield Goal

Nitrogen

Soil NO3-N Test
Soil NO3-N Test
Soil Organic Matter (%)
0 - 0.5
0.6 - 1.0
1.1 - 1.5
1.6 - 2.0
> 2.0
ppm
Fertilizer Rate (lb N/Acre)
0 - 6
36
26
16
6
0
7 - 12
16
6
0
0
0
13 - 18
0
0
0
0
0
19 - 24
0
0
0
0
0
25 - 30
0
0
0
0
0
31 - 36
0
0
0
0
0
> 36
0
0
0
0
0

Add or subtract 1.55 lbs N/bushel change in grain yield goal.

 

Phosphorus

Soil Phosphorus Test
Soil Phosphorus Test
(ppm)
Fertilizer Phosphorus
(lb P2O5/Acre)
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
0 - 6
20
40
65
7 - 14
0
20
45
15 - 22
0
0
25
> 22
0
0
0

Add or subtract 0.7 lbs P2O5/bushel change in grain yield goal.

Soil Classification

Soil Texture Descriptions
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
Sand, loamy sand, sandy loam
Silt, silt loam, loam, and sandy clay loam
Sandy clay, clay loam, silty clay loam, silty clay, clay

 

Dryland Oats - 45 45 bu/Acre Yield Goal

Nitrogen

Fertilizer Rates
Soil NO3-N Test
Soil Organic Matter (%)
0 - 0.5
0.6 - 1.0
1.1 - 1.5
1.6 - 2.0
> 2.0
ppm
Fertilizer Rate (lb N/Acre)
0 - 6
36
26
16
6
0
7 - 12
16
6
0
0
0
13 - 18
0
0
0
0
0
19 - 24
0
0
0
0
0
25 - 30
0
0
0
0
0
31 - 36
0
0
0
0
0
> 36
0
0
0
0
0

Add or subtract 1.15 lbs N/bushel change in grain yield goal.

 

Phosphorus

Phosphorus Rates
Soil Phosphorus Test
(ppm)
Fertilizer Phosphorus
(lb P2O5/Acre)
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
0 - 6
20
40
65
7 - 14
0
20
45
15 - 22
0
0
25
> 22
0
0
0

Add or subtract 0.5 lbs P2O5/bushel change in grain yield goal.

Soil Classification

Soil Texture Descriptions
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
Sand, loamy sand, sandy loam
Silt, silt loam, loam, and sandy clay loam
Sandy clay, clay loam, silty clay loam, silty clay, clay

 

Dryland Wheat- 30 bu/Acre Yield Goal

Nitrogen

Fertilizer Rates
Soil NO3-N Test
Soil Organic Matter (%)
0 - 0.5
0.6 - 1.0
1.1 - 1.5
1.6 - 2.0
> 2.0
ppm
Fertilizer Rate (lb N/Acre)
0 - 6
36
26
16
6
0
7 - 12
16
6
0
0
0
13 - 18
0
0
0
0
0
19 - 24
0
0
0
0
0
25 - 30
0
0
0
0
0
31 - 36
0
0
0
0
0
> 36
0
0
0
0
0

Add or subtract 1.72 lbs N/bushel change in grain yield goal.

Phosphorus

Phosphorus Rates
Soil Phosphorus Test
(ppm)
Fertilizer Phosphorus
(lb P2O5/Acre)
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
0 - 6
20
40
65
7 - 14
0
20
45
15 - 22
0
0
25
> 22
0
0
0

Add or subtract 1.0 lbs P2O5/bushel change in grain yield goal.

Soil Classification

Soil Texture Descriptions
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
Sand, loamy sand, sandy loam
Silt, silt loam, loam, and sandy clay loam
Sandy clay, clay loam, silty clay loam, silty clay, clay

 

Dryland Millet- 35 bu/Acre Yield Goal

Nitrogen

Fertilizer Rates
Soil NO3-N Test
Soil Organic Matter (%)
0 - 0.5
0.6 - 1.0
1.1 - 1.5
1.6 - 2.0
> 2.0
ppm
Fertilizer Rate (lb N/Acre)
0 - 6
70
60
50
40
30
7 - 12
50
40
30
20
10
13 - 18
30
20
10
0
0
19 - 24
10
0
0
0
0
> 24
0
0
0
0
0

Add or subtract 2.0 lbs N/bushel change in grain yield goal.

Phosphorus

Soil Phosphorus Rates
Soil Phosphorus Test
(ppm)
Fertilizer Phosphorus
(lb P2O5/Acre)
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
0 - 6
20
40
60
7 - 14
0
20
40
15 - 22
0
0
20
> 22
0
0
0

Add or subtract 0.6 lbs P2O5/bushel change in grain yield goal.

Soil Classification

Soil Texture Descriptions
Coarse-textured Soils
Medium-textured Soils
Fine-textured Soils
Sand, loamy sand, sandy loam
Silt, silt loam, loam, and sandy clay loam
Sandy clay, clay loam, silty clay loam, silty clay, clay

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