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This site is dedicated to helping CCAs find the self-study CEUs they need – not just to maintain their certification but to improve their understanding of agronomic principles.

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Nitrogen (video)
Soil Fertility Manual Chapter 3
Adrian Johnston
Nitrogen (N) is essential for plant growth and is a part of every living cell. It plays many roles in plants and is necessary for chlorophyll synthesis. Symptoms of N deficiency in plants usually include chlorosis or yellowing. Adequate N is important for water use efficiency. The amount of soil N in available form (inorganic) is very small, while a high proportion is unavailable (organic) N. Nitrates are readily available for crops, mobile in the soil, and can be lost through denitrification. Use of nitrification inhibitors or slow release forms of N can improve N use efficiency. Nitrogen fixation must occur before N can be used by plants. Harvested crops remove considerable amounts of N from the soil. Most forms of N tend to increase soil acidity. Many different N fertilizers are available, containing various forms and contents of N.
 

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