Class Number_______
Agronomy 354 Problem Set 4
Spring 2016
Problem sets are due ca. one week after they are handed out in lecture. To receive full
credit (4 points each), work must be shown as to how the answer was obtained, the
correct answer must be written on the indicated line, the units of the answer must be
indicated and correct, and the assignment must be handed-in by the due date. Check
the course homepage for sample problems and solutions.
1. Ximelagatran (C24H35N5O5) is a drug that is a possible replacement for warfarin.
What is the % N content of this compound?
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2. What is the % C of this compound?
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3. What is the C:N ratio of this compound?
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4. If three tons (dry weight) of a plant residue containing 1.1% N was added to a moist
soil, make reasonable assumptions and calculate the expected amount of C released
as CO2 in an 8-wk period.
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5. How much N would you expect to be mineralized or immobilized in the same period
asked in question #4? State your assumptions and specify whether this N is
mineralized or immobilized.
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