Assume that (because of environmental regulations) the maximum rate of poultry litter that a pasture can receive is that which supplies an amount of P equal to that taken up by the forage. The forage absorbs 250 kg N/ha and 40 kg P/ha.

a) What would be the poultry litter rate (lbs/A) you could apply if the litter contains 3.5% N and 1.7% P?

b) If only 50% of the N in the poultry litter is available to the forage, how much ammonium nitrate ((kg/ha) would you have to add to make sure the amount of available N applied with the litter and ammonium nitrate is equal to that taken up by the forage (250 kg N/ha)?