o De × . Mail . szpol 12@tigerm. × / D Fertilizer problems 1-5 x- Downloads erti

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o De × . Mail . szpol 12@tigerm. × / D Fertilizer problems 1-5 x- Downloads ertilizer%20problems%201 %20.%20 5.pdf residue, the residue cover is 23%. If a 50 ft, tape is used, multiply by two the number of foot marks you count. Repeat this procedure at least three times over the field and obtain an average for the locations. 5. Using the demonstration material available, decide the percent residue cover in each case. PRACTICE PROBLEM SET 1 1. Lester Lotsacorn sampled his soil, sent the sample to a testing laboratory, and the analysis shows that he needs to apply 150 lb/A N and 25 lb/A banded phosphate to the corn crop he will be seeding. He can purchase 45-0-0 and 18-46-0 fertilizer. How much of each fertilizer should he apply per acre? 2. How much of each fertillzer should he purchase for his 200-acre field? 275- Introductory Crop Science

Explanation / Answer

1.Rate of nitrogen application required=150 lb/ A

% of nitrogen in the fertiliser 45-0-0= 45%=0.45

150lb/acre/0.45=333.33 lb of nitrogen required for the fertiliser 45-0-0

% of nitrogen in the fertiliser 18-46-0=18%=0.18

(150lb/A)/0.18=833.33 lb of nitrogen required for the fertiliser 18-46-0

Rate of phosphate required to apply=25lb/A

% of phosphate in the fertiliser 18-46-0=46%=0.46

(150lb/A)/0.46=326.08lb

2. If the amount of nitrogen required per acre of the fertiliser 45-0-0 then

for 200 acre nitrogen required=333.33*200=66,666 lb

Amount of nitrogen required per acre of the fertiliser 18-46-0= 833.33lb

For 200 acre nitrogen required of the fertilser 18-46-0=200*833.33=166,666lb

If the amount of phosphate required per acre of the fertiliser 18-46-0=326.08lb

For 200 acre nitrogen required of the fertiliser 18-46-0=326.08*200=65,216 lb

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