Reference no: EM13752133
1. Given the information below, calculate the following.
profile NO3-N = 10 lbs/A Previous crop = wheat
Soil OM content = 2.0% 60 bu/a
Soil OM degradation rate = 1%/year 100 lb residue/bu
40% residue C
C:N = 100
a. Additional N needed to degrade all the residue. (lb N/A)
b.The farmer wants to plant sorghum next season. How much total fertilizer N will he need to apply if he raises 100 bu/A (test weight = 56 lb/bu; grain N = 1.5%; residue = 50 lb/bu; residue N = 0.6%).
2. Lawn fescue contains a C:N ratio of 30:1 and we return 3000 lb/ac per year to the soil. Assume 40% C content.
a. Will available soil N be depleted if the soil contains 4% soil OM and decomposes at a rate of 1% per year?
3. 6.8g of ammonium nitrate containing 34% N is added to 3,000g of soil for a greenhouse experiment. Calculate the following based on the soil weight:
a. ppm NO3- added
b. ppm NH4+ added
c. % fertilizer N in soil after addition
d. lbs of actual N/ acre-foot of soil
4. A farmer wants to apply 150 lbs N/a.
a. How many kg/ha anhydrous ammonia does he need?
b. How many lbs/a urea does he need?
c. How many lbs/a urea ammonium nitrate does he need?
7. Given the following information, estimate the N rate needed for 150 lb/1000 ft2Bermudagrass?
Previous year's Bermuda crop: 150 lb/1000 ft2 40% residue C; Residue C:N = 50
next year's bermuda crop: 150 lb/1000 ft2 2% N in clippings
Soil Data: 2% OM 1% OM loss/yr
What would the N rate be if 100 lbs /1000 ft2 of the grass clippings were removed?
8. A grower applies 100 lb/a of 10-34-0.
a. Calculate the lb P2O5/a applied.
b. Calculate the lbs P/a applied
c. Calculate application rate in lb P2O5/1000 ft2
d. Calculate the g P2O5/kg potting soil.
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Additional n needed to degrade all the residue
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