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Old April 25, 2012   #2
fortyonenorth
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Location: NW Indiana
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John - are you referring to nutrient removal, i.e. how much of each mineral nutrient is used by different crops? Take a look at this: http://www.soil.ncsu.edu/publication...ag-439-16W.pdf

This doesn't necessarily equate to how much NPK to add. That will vary depending on what you already have present in your soil and other factors. Also, plants don't use NPK and other nutrients in a linear manner. Tomatoes, for example, will extract more N early in the growing cycle and more K later when they are setting and maturing fruit.
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