Fertilizers
Choice of fertilizers Nitrogen: In Oil Palm plantations, fertilizers like urea, ammonium sulphate and diammonium phosphate may be used as a source of nitrogen as per their availability in the market. However, urea is found to be cheaper. There is a strong interaction between N and P fertilizers as applied N fertilizer will not be efficiently utilized unless adequate P fertilizer is applied. Phosphorus: Fertilizers like single super phosphate, rock phosphate and diammonium phosphate can be applied as a source of phosphorus nutrition. Rock phosphate is generally profitable in oil palm as compared to super phosphate. However, under high pH conditions, application of rock phosphate is not recommended. Potassium: Potassium may be applied as chloride or sulphate according to availability and price. Potassium chloride (Muriate of potash) is found to be cheaper and available in local market. Magnesium: Magnesium sulphate can be applied as a source of Mg to oil palm. Frequenc