Answer:
a) how many mg of n/ kg of soil is mineralized every year? Nitrogen mineralized every year = 60 mg N/kg of soil
b)the mass of the soil is 2,000,000 kg/ha, calculate the kg of n mineralized/ ha of soil.
120 kg/ha of nitrogen is mineralized every year.
Step-by-step explanation:
To calculate the amount of nitrogen mineralized every year, we can use the formula:
Nitrogen mineralized every year = Nitrogen in organic forms x Mineralization rate
From the problem statement, we know that the soil contains 2000 mg N/kg of soil in organic forms and the rate of mineralization is 3% per year.
Substituting these values into the formula above, we get:
Nitrogen mineralized every year = 2000 mg N/kg of soil x 3%
Nitrogen mineralized every year = 60 mg N/kg of soil
To calculate the kg of N mineralized/ha of soil, we can use the formula:
kg of N mineralized/ha of soil = (Nitrogen mineralized every year x Mass of soil)/1000
From the problem statement, we know that the mass of the soil is 2 000 000 kg/ha.
Substituting these values into the formula above, we get:
kg of N mineralized/ha of soil = (60 mg N/kg of soil x 2 000 000 kg/ha)/1000
kg of N mineralized/ha of soil = 120 kg/ha
Therefore, 120 kg/ha of nitrogen is mineralized every year.