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 | nutrient deficiency |
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| nutrient removal |
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| oats |
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| oilseeds |
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| plant analysis |
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 | potassium |
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| Brazil |
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| Eastern Canada & Northeast U.S. |
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| North and West Zone India |
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| Northcentral U.S. |
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| HEILONGJIANG-07 | Study of dynamic changes in soil potassium content and its agronomic regulations in Heilongjiang province and the fertilization of some crops | |
| HEILONGJIANG-NMS01 | Soil Nutrient Management Technology and Precision Agriculture in Heilongjiang | |
| JILIN-06 | Cycling of potassium under continuous cropping of maize and its balanced regulation and control | |
| LIAONING-05 | Research on the requirement and use of potassium in Liaoning province | |
| Northeast India & Bangladesh |
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| Northern Latin America |
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| Oceania |
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