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Macronutrients are needed in greater amounts, so are therefore more essential to plants than micronutrients

Essential nutrients $($eg nitrogen, calcium, iron and others$)$ can be toxic

Mobile nutrients show their deficiency in upper leaves

Plant essential nutrients are needed in different proportions

The enzyme nitrogenase is found in certain legume$-$associated bacteria and converts atmospheric nitrogen $($N$2)$ into ammonia $($NH$3)$