Assume broiler litter collected from a broiler house contains 0.45 g N in the fo

Question

Assume broiler litter collected from a broiler house contains 0.45 g N in the form of NH^+_4 per kg of litter as well as two pools of mineralizable N, one fast (Nf=12 g N kg^-1 litter) and one slow (Ns=7 g N kg^-1 litter). The rate constant of mineralization for Nf is k=1.2 d^-1 and the rate constant of mineralization for Ns is h=0.027 d^-1. Assume you use the collected broiler litter to fertilize a crop at 5500 kg broiler litter ha^-1. Use the model below to estimate the amount of N mineralized from the poultry litter (kg N ha^-1) in 120 days if the average water content in 120 days of mineralization is 0.08 g H_2 O g^-1 soil and the average temperature is 10 degree C. Nm =Nf(1-e^-k x Ft x Fwx t) + Ns(1-e^-h x Ftx Fwxt) where Nm =N mineralized (g N kg^-1 broiler litter) k= rate of mineralization of fast pool, h= rate of mineralization of slow pool t=time in days If the poultry litter is mixed in the upper 15 cm of a soil with a bulk density of 1.5 g cm^-3 and a lime buffer capacity (LBC) of 8 meq/kg/pH, calculate the change in pH due to the amount of N mineralized in above. Assume the initial soil pH is 6.0 (See Table 3-3 in text for effect of mineralization of 1 mol of N on H^+ consumption). If the initial NH^+_4 present in the litter plus the NH^+_4 released through mineralization undergo nitrification, calculate the final pH of the soil after all the N as NH^+_4 has been nitrified (see Table 3-3 in text for effect of nitrification of 1 mol of N on H^+ production).

Explanation / Answer

Nm=Nf(1-e-k*ft*fw*t) + Ns(1-e-h*ft*fw*t)

Nf=12gNkg-1

Ns=7gNkg-1

k=1.2d-1

h=0.027d-1

t=120 days

Ft=(St-5/20)

=(10-5/20)=0.25

Fw=Sw/0.3

=0.08/0.3=0.26

Nm=12(1-e-1.2*0.25*0.26*120) + 7(1-e-0.027*0.25*0.26*120)

=12(1-e-9.36)+7(1-e-0.21)

=12+7(1-e-9.57)

=19(1-e-9.57)

=19(1-2.25)=19*1.25

=23.75

Since 23.75g N/kg of NH4+ mineralised

for 5500 kg broiler litter

=23.75*5500 kg

=130,625g/N

=12(

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.