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Essential nutrients for plants: Part IV

This week’s column starts tackling the macronutrients we fertilize for – Nitrogen (N), Phosphorus (P), and Potassium (K). These are also termed Primary Nutrients as they are needed in larger amounts. Nitrogen is found in the soil as nitrate, a negatively charged ion, and ammonium, a positively ion. Phosphorus is found as a negatively charged ion and Potassium as a cation. N is the only one found in both a positively and negatively charged for. These nutrients are found in the soil solution and organic matter. Ammonium and potassium as cations may also be found on cation exchange sites. Nitrate ...


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