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Maximum Nitrogen Rates With Small Grain

The amount of germination damage associated with applications of fertilizer with the seed at planting will vary with seasonal or yearly climatic conditions and among or between locations. Growers should consider all factors that influence germination damage when determining the amount of N fertilizer to apply with the seed at planting. Tables 1 and 2 are provided as general guidelines for the amount of N fertilizer to apply with the seed at planting based on only soil texture and seedbed utilization factors. Rates may need to be adjusted upward or downward based on the grower's specific conditions at planting related to soil water, fertilizer material and crop seeded.

Table 1. Maximum Nitrogen fertilizer rates with small grain seed at planting based on planter spacing, planter type and seedbed utilization
 

Planter Spacing
Planter Type Seed Spread -6 inch -7.5 inch- -10 inch- -12 inch-
  inches SU lb N/Ac SU lb N/Ac SU lb N/Ac SU lb N/Ac
Double Disc 1 17% 20-30 13% 19-28 10% 17-23 8% 15-20
Hoe 2 33% 32-44 27% 27-38 20% 23-31 17% 20-27
  3 50% 44-58 40% 37-48 30% 30-40 25% 26-34
Air Seeder 4 66% 56-72 53% 46-58 40% 37-48 33% 32-42
  5 83% 68-86 68% 56-68 50% 44-57 44% 38-49
  6 100% 80-100 80% 66-79 60% 51-55 50% 44-56
  7     94% 76-90 70% 58-74 58% 50-64
  8         80% 66-83 67% 56-71
  9         90% 73-92 75% 62-78
  10         100% 80-100 83% 68-86
  11             92% 74-93
  12             100% 80-100

SU= Seedbed utilized

Table 2. Maximum nitrogen fertilizer rates with small grain seed at planting based on soil texture and seeded utilization
 

Percent of Seedbed Utilized
10-20 30-50 60-100
 

Particle Size

 Double Disc Seeder Hoe Air
Soil Texture Sand Silt Clay 1 inch 2-3 inch 4-12 inch
 

------------Percent -------------------

 ------------------- lb N per acre -------------------
Loamy sand 80 10 10 5 10-20 25-40
Sandy loam 60 35 15 10 15-25 30-45
Sandy clay loam 55 15 30 15 20-30 35-50
Loam 40 40 20 20 25-35 40-55
Silt loam 20 65 15 25 30-40 45-60
Silty clay loam 10 55 35 30 35-45 50-70
Clay loam 30 30 40 35 40-50 55-80
Clay 20 20 60 40 45-55 60-100

Edward J. Diebert, EB-62

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