QUIZ ON NITROGEN
(18)1. Describe the effect of nitrogen fertilization of crops on the following plant responses.
a. Rate of maturation of crops ___________________________________________________________
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b. Strength of plant stems _______________________________________________________________
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c. Protein concentrations in cells _________________________________________________________
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(14) 2. What are some general characteristics of crops that have a high requirement for nitrogen fertilization? (List two characteristics.)
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b.__________________________________________________________________________________
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(18) 3. Describe the symptoms of nitrogen deficiency on a crop which has exhausted the supply of nitrogen from the soil during a growing season.
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(18) 4. If a crop is showing symptoms of nitrogen deficiency before reaching maturity, what characteristics should a nitrogen fertilizer have for supplying nutrition to the crop in the current growing season?
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List two fertilizers that one could use. (a) __________________________________________________
b. __________________________________________________________________________________
(14). 5. Explain why only about half of the nitrogen added to soil as a fertilizer is recovered by crops. (Describe a process by which N is lost or describe a condition that causes plants not to recover the N).
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List a practice that a farmer might use to increase efficiency of nitrogen usage by crops, that is to lessen losses or to increase recovery.
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(18) Identify the following terms by definition.
a. Humification _______________________________________________________________________
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b. Nitrogen immobilization ______________________________________________________________
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c. Nitrogen mineralization ______________________________________________________________
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