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Rate: 1.3 lbs. / Bu. of yield goal Timing 1/3 or planting 2/3 or sidedress Source/Application method Urea sources may volatilize on surface.

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Presentation on theme: "Rate: 1.3 lbs. / Bu. of yield goal Timing 1/3 or planting 2/3 or sidedress Source/Application method Urea sources may volatilize on surface."— Presentation transcript:

1 Rate: 1.3 lbs. / Bu. of yield goal Timing 1/3 or planting 2/3 or sidedress Source/Application method Urea sources may volatilize on surface Inject N-sol or minimize broadcast amount Ammonium nitrate preferred for broadcast Rate: 1.3 lbs. / Bu. of yield goal Timing 1/3 or planting 2/3 or sidedress Source/Application method Urea sources may volatilize on surface Inject N-sol or minimize broadcast amount Ammonium nitrate preferred for broadcast Nitrogen Fertility

2 V6 V12 Silk Milk Dent P.M % of Uptake Corn Nitrogen Uptake

3 Sidedress N Placement Fibrous, lateral root system Nitrogen is mobile in soil Avoid root pruning Fibrous, lateral root system Nitrogen is mobile in soil Avoid root pruning Row middle is preferable

4 Beneficial before tassel Amount dependent on height Corn less than 3 ft: 200 lbs/a Corn taller than 3 ft: lbs/a. Ammonium nitrate is preferred Urea is volatile when broadcast Foliar N = No response Beneficial before tassel Amount dependent on height Corn less than 3 ft: 200 lbs/a Corn taller than 3 ft: lbs/a. Ammonium nitrate is preferred Urea is volatile when broadcast Foliar N = No response Supplemental Nitrogen

5 Poly vs Orthophosphates % of P as ortho More nitrogen Less expensive % of P as ortho More nitrogen Less expensive Contains K Less corrosive More expensive Contains K Less corrosive More expensive No difference in field studies Starter Fertilizer Sources

6 Precision is critical Dont plant in the mud Minimal soil temp of 50° F Calibrate and check in the field Lubricate planter and seed Plant 1 ½ - 2 inches deep Drive slow < 5mph Precision is critical Dont plant in the mud Minimal soil temp of 50° F Calibrate and check in the field Lubricate planter and seed Plant 1 ½ - 2 inches deep Drive slow < 5mph Corn Planting Rules

7 Yield Response to Plant Population Plants per Acre Yield (% of max.)

8 Dryland Seeding Chart Seeding Rate Seed Spacing (inches)Final Stand 30-inch38-inch40-inch 5% loss10% loss

9 Irrigated Seeding Chart Seeding Rate Seed Spacing (inches)Final Stand 30-inch38-inch40-inch 5% loss10% loss

10 VE V6 V12 VT/Silk Milk Dent Mature Corn Physiological Development Apr 1 May 1June 1Aug 1July 1 Drydown Vegetative Stages Reproductive Stages

11 Corn Nutrient Requirements CropYieldP2O5P2O5 K2OK2OSMg Corn Cotton Soybeans Wheat Dont Guess – Soil Test!


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