Poultry floor litter containing 4.2% total N, 0.2% mineral N, and 2.5% total P i

Question

Poultry floor litter containing 4.2% total N, 0.2% mineral N, and 2.5% total P is used to supply N to a crop of bermudagrass hay. The N requirement for the desired level of production is 200 kg N/hectare.

a) Assuming there will be negligible N mineralized form the soil organic matter, how much poultry litter should be applied the first year?

b) How much poultry litter should be applied the second year?

c) Assuming that a reasonable average annual yield for bermuda grass in Arkansas is 6 tons (dry weight) per acre and that Bermuda grass tissue contains 0.3% P on a dry weight basis, will the quantity of P supplied by these litter application rates be less than, equal to, or greater than the P requirement of the crop?

Explanation / Answer

GIVEN THAT,

Poultry floor litter containing 4.2% total N, 0.2% mineral N, and 2.5% total P is used to supply N to a crop of bermudagrass hay.

The N requirement for the desired level of production is 200 kg N/hectare.

a) 1 ACRE REQUIRES- 200 Kg N

1 HECTARE = 2.50 ACRES

THEREFORE, 1 ACRE REQUIRES 200 Kg/2.50 = 80 Kg N

REASONABLE AVERAGE YIELD IS 6 TONS PER ACRE.

b) SIMILARLY, 2ND YEAR ALSO SAME REQUIREMENT IS NECESSARY.

c) 0.25 %.TOTAL P IS USED TO SUPPLY TO 1 ACRE.

ONLY 0.3 % P IS SUPPLIE D.

HENCE, the quantity of P supplied by these litter application rates ARE less than, than the P requirement of the crop

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