PO 23. Recognize how the following terms relate to plant nutrient level.
- Critical value or range
- Sufficiency range
- Optimum, below optimum, and above optimum soil nutrient levels
- Luxury consumption
- Toxicity level
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Corn plants exhibiting symptoms of low (left), adequate (middl e), and excessive (right) nitrogen. (image from http://nmsp.css.cornell.edu/publications/factsheets/factsheet31.pdf)
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