(D) Macronutrients that frequently become deficient in the soil are known as critical elements.There are three such elements: $N$ (Nitrogen),$P$ (Phos

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Nitrogen,phosphorus and potassium

(D) Macronutrients that frequently become deficient in the soil are known as critical elements.There are three such elements: $N$ (Nitrogen),$P$ (Phosphorus),and $K$ (Potassium).These elements are commonly supplied to crops in the form of fertilizers to ensure optimal growth.