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Extension > Agriculture > Nutrient Management > Nutrient/Lime Guidelines > Fertilizer Recommendations for Agronomic Crops in Minnesota > Millet

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Fertilizer Recommendations for Agronomic Crops in Minnesota

Millet

Daniel E. Kaiser, Extension Soil Scientist; John A. Lamb, Extension Soil Scientist; and Roger Eliason, Director, University of Minnesota Soil Testing Laboratory

Revised 2011

This crop is important in some farm enterprises in Minnesota. Fertilizer is an important production input for optimum yields. Recommendations for nitrogen, phosphate, and potash are summarized in the tables that follow.

subsoil map

Figure 1. The fall soil nitrate test should be used for nitrogen recommendations in the counties that are shaded.

Nitrogen

Nitrogen (N) fertilizer guidelines can be based on the results of the soil (NO3--N) test or the consideration of the combination of expected yield, previous crop, and soil organic matter content. The soil nitrate test is appropriate for western Minnesota (see Figure 1).

When the soil nitrate test is used, the fertilizer N guidelines are calculated as follows.

Nrec = (0.035) (EY) — STN(0-24 in.) — NPc

Where:

EY = expected yield (lb./acre)
STN = nitrate-nitrogen (NO3--N) measured to a depth of 24 in. (lb./acre)
Npc = amount of N supplied by the previous legume crop (lb./acre).
These N credits are summarized in Table 1.

Table 1. Nitrogen credits for various legume crops that might precede barley in a crop rotation. Use these credits for the "Npc" factor in situations where the soil nitrate test is used.

Previous Crop 1st Year Nitrogen Credit
  lb. N/acre
  Soybean 20
  Edible  beans, field peas 10
  Harvest sweetclover 10
  Harvested alfalfa*  
    4 to 5 plants/ft2 75
    2 to 3 plants/ft2 50
    1 or fewer plants/ft2 0
  Harvested red clover 35

* Add 20 lb. N/acre to the credits listed if the 3rd or 4th cutting was not harvested.

The N fertilizer guidelines for situations where the soil NO3--N test is not used are listed in Table 2. The suggested rate of N fertilizer should be applied before planting. All sources of fertilizer should have an equal effect on yield.

Crops in Group 1:

Alsike clover, birdsfoot trefoil, grass/legume hay, grass legume pasture, fallow, and red clover.

Crops in Group 2:

Barley, buckwheat, canola, corn, grass hay, grass pasture, oat, potato, rye, sorghum-sudan, sugar beet, sunflower, sweet corn, triticale, and wheat.

Table 2. Nitrogen fertilizer guidelines for millet for situations where the soil NO3--N test is not used.

    Expected Yield (lb.acre)
  Crop Grown Last Year Organic Matter Level* 1500-1900 1901-2300 2301-2700 2701-3000 3100 +
  Alfalfa (4+ plants/ft2) Low
Med and high
0
0
0
0
0
0
0
0
0
0
  Alfalfa (2 to 3 plants/ft2) Low
Med and high
0
0
0
0
0
0
20
0
40
20
  Soybeans
  Alfalfa (1 or less plants/ft2)
Low
Med and high
0
0
10
0
20
0
40
20
60
40
  Edible beans, field peas Low
Med and high
20
0
30
10
40
20
60
40
80
60
  Group 1 Crops Low
Med and high
0
0
0
0
0
0
0
0
25
0
  Group 2 Crops Low
Med and high
40
20
50
30
60
40
80
60
100
80

* low = less than 3.0%; medium and high = 3.0% or more.

Phosphate and Potash

Current phosphate guidelines are summarized in Table 3. Guidelines for potash are in Table 4. The guidelines listed in these tables are intended for broadcast application. The sensitivity of this crop to banded application of fertilizers is not known.

CAUTION! Do not apply N as urea (46-0-0) in contact with the seed at planting. Do not apply ammonium thiosulfate (12-0-0- 26) or boron in contact with the seed.

Table 3. Phosphate guidelines for millet production.

    Phosphorus (P) Soil Test, ppm*
Expected
Yield
Bray: 0-5 6-10 11-15 16-20 21 +
Olsen: 0-3 4-7 8-11 12-15 16 +
lb./acre   — P2O5 to apply (lb./acre) —
1500-1900   25 20 10 0 0
1901-2300   30 25 15 0 0
2301-2700   40 25 15 0 0
2701-3100   45 30 20 0 0
3100 +   45 35 20 0 0

* Use one of the following equation if a phosphate guideline for a specific soil test and a specific expected yield is desired.

P2O5 rec = [0.0171 — (0.0085) (Bray P, ppm)] (Expected Yield)
P2O5 rec = [0.0171 — (0.00114) (Olsen P, ppm)] (Expected Yield)

Table 4. Potash guidelines for millet production.

Expected Yield Potassium (K) Soil Test, ppm*
0-40 41-80 81-120 121-160 161 +
lb./acre    
1500-1900 45 35 20 10 0
1901-2300 55 40 25 10 0
2301-2700 65 50 30 10 0
2701-3100 75 55 35 15 0
3100 + 80 60 40 15 0

*Use the following equation if a potash guideline for a specific soil test and a specific expected yield is desired.

K2O rec = [0.03 — (0.00018) (Soil Test K, ppm)] (Expected Yield)

There is no research evidence which suggests that sulfur and the micronutrients are needed for optimum production of this crop. Therefore, there is no suggestion to add these nutrients to a fertilizer program.

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