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The most important advantage of KNO₃ versus many other fertilizers is that its contribution to salinity buildup is negligible. Both K and nitrate, which are the building blocks of this fertilizer, are macronutrients, and therefore, they are taken up in large rates while non-nutrient residues are not left in the soil. Potassium nitrate can counteract the deleterious effects of the chloride and the sodium in plant metabolism.