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.

Multiply the amount of fertilizer you are applying (1lb per acre) by the percentage of phosphate or nitogen in the bag (x). Remember to convert the percentages of phosphate and mitrogento their decimal forms.

150 lb per 1 acre

For, 45-0-0

N= 150/ .45 = 333.3 lbs to cover one acre

For 18-46-0

P= 25/ .46 = 54.3 lbs to cover one acre

54.3x .18 = phosphate per 1 acre

                  =9.774 lbs –same-

Therefore 333.3-9.8 = 323.5 lbs/ acer of 45-0-0

And 54.3 lbs/ acre of 18-46-0 is required.

2.

For 200 acre,

For, (45-0-0/ acre ) x 200 = 64700 lbs

For ( 18-46-0/acre) X 200 = 10860 lbs

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