Exercise 2: Determining a Phosphorus Nutrient Recommendation and Fertilizer Rate
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1 Exercise 2: Determining a hosphorus and Rate Exercise: Determine a 2 year phosphorus fertilizer application rate based on the Tri-State s using the soil test results for Field 2 and Field 5 below. Use the Tables on age 2 to record your results. Yield Goals for Fields 1-5 expressed in bu/a. Year Crop Corn Soybeans
2 and Worksheet-Exercise 2. Field ID Field 2 -hosphorus 2016 Crop Corn Yield 170 bu/a 2017 Crop Soybeans Yield 45 bu/a - 2O Bray 1 9 Needed applied Extra s Field ID Field 5 -hosphorus 2016 Crop Corn Yield 200 bu/a 2017 Crop Soybeans Yield 50 bu/a - 2O Bray 1 24 Needed applied Extra s
3 Tables from Tri-state s needed to complete exercise. Table 13. (2O5) s for Corn. (adapted from Tri-state s for Corn, Soybeans, Wheat and Alfalfa) Soil Test Level (expressed as ) and Method Bray 1 Colorimetric Mehlich III-IC Realistic Yield Goal (bu/acre) M M lbs 2O5/acre recommended Table 15. (2O5) s for Soybean. (adapted from Tri-state s for Corn, Soybeans, Wheat and Alfalfa) Soil Test Level (expressed as ) and Method Bray 1 Colorimetric Mehlich III-IC Realistic Yield Goal (bu/acre) M M lbs 2O5/acre recommended
4 Determining fertilizer amount needed to meet nutrient recommendation. A granular fertilizer rate to meet a nutrient recommendation is determined in the following way: We are selecting Mono-Ammonium hosphate (MA) or as the nutrient source to meet 125 pound 2O 5 need. Need 2O 5 Divided % 2O 5 content of the Equals ounds of per acre to by fertilizer source meet nutrient need = 240 How much nitrogen is applied? ounds of per acre to meet nutrient need Multiplied by % N content of the fertilizer source Equals ounds of nitrogen per acre in the fertilizer application 240 x 0.11 = 26 A liquid fertilizer rate to meet a nutrient recommendation is determined in the following way: We are selecting olyphosphate or which weighs lbs per gallon as the nutrient source to meet 125 pound 2O 5 need. Need 2O 5 Divided by % 2O 5 content of the fertilizer source Equals ounds of per acre to meet nutrient need Divided by Liquid weight in pounds per gallon Equals Gallons of applied per acre to meet nutrient need = = 37.8 How much nitrogen is applied? ounds of Multiplied per acre to meet by nutrient need % N content of the fertilizer source Equals ounds of nitrogen per acre in the fertilizer application 441 X 0.10 = 44 4
5 and Worksheet-Exercise 2. (Answer Key) Field ID Field 2 -hosphorus 2016 Crop Corn Yield 170 bu/a 2017 Crop Soybeans Yield 45 bu/a Bray 1 9-2O 5 (From Table 13) (From Table 15) Needed applied ( ) 288 lbs Extra s (288 x 0.11) 32 lbs of N Field ID Field 5 -hosphorus 2016 Crop Corn Yield 200 bu/a 2017 Crop Soybeans Yield 50 bu/a Bray O 5 (From Table 13) (From Table 15) Needed applied ( ) 221 lbs Extra s (221 x 0.11) 24 lbs of N 5
6 and Worksheet Field ID -hosphorus 2016 Crop Yield 2017 Crop Yield - 2O Bray 1 Needed applied Extra s Field ID -hosphorus 2016 Crop Yield 2017 Crop Yield - 2O Bray 1 Needed applied Extra s 6
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