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 | extension |
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 | fertilizer economics |
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| Eastern Canada & Northeast U.S. |
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| Great Plains U.S. |
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| North and West Zone India |
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| NWZ INDIA-51 | Maximization of yield and profits in a groundnut-wheat cropping sytem in Saurashtra region of Gujarat | |
| NWZ INDIA-69 | Assessment of Phosphorus and Potassium Requirements for Maximum Economic Yield of Major Crops of Central Plain Zone of Uttar Pradesh | |
| Northcentral China |
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| Northern Great Plains |
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| Northwest China |
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| Southern India & Sri Lanka |
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| Western U.S. |
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| field variability |
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| foliar fertilization |
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| fruits |
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| high yields |
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| irrigation |
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