1. You are given 100 kg of ground corn stalk residue (C/N = 80:1) to add to your garden. You can assume that the residue is 50% C and that 70% of the C will be converted to CO2during the decay process. Assume that the C/N ratio of microbial biomass is 7.5:1. Answer the following questions. Show all calculations.
A. How many kg of C have you added to the soil?
50kg
B. How many kg C are released as CO2?
50kg*.7 = 35kg Co2
C. How many kg of N have you added to the soil?
50kgC *.8 = 40Kg ..... 50-40 = 10kg N
D. How many kg of N will be needed to completely convert the residue to new microbial biomass?
50kgC * .075 = 3.75 Kg N
E. How many kg of N will be mineralized/immobilized?
10Kg N - 3.75 Kg N = 6.25 Kg N immobilized in soil profile
I am pretty sure that's right. I may be mistaken on part C.....