Problem+set+7

Problem+set+7 - Name: _ Problem Set #7 Due: Wednesday,...

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Name: _________________________________________ Problem Set #7 Due: Wednesday, November 24 th 1. Whether or not nitrogen fertilizer is required depends on the crop grown and the yield desired. You want to grow a crop of corn that yields 15 Mg (tons) per hectare. Assume that the total amount of N required to obtain this yield is 200 kg N/ha and that the sources of N are from exchangeable NH 4 + and N mineralization from soil organic matter . From the following information, determine whether N will have to be added as a fertilizer; if so, how much N fertilizer will have to be added per hectare?? Answer the following series of questions to determine your answer. Show your work! Rooting depth = 20 cm 1 ha = 100 m x 100 m = 10,000 m 2 Bulk density = 1250 kg/m 3 1 kg = 1000 g Exchangeable NH 4 + = 0.014 g NH 4 /kg soil Organic matter content = 4% Nitrogen content of organic matter = 5% a. What is the mass of soil in the 20 cm rooting zone (kg) of one hectare? (soil volume x bulk density) b. What is the mass of nitrogen
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Problem+set+7 - Name: _ Problem Set #7 Due: Wednesday,...

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