While applying DAP (as a basal dose), it should be never mixed with

Answer: Option A

While applying DAP (as a basal dose), it should be never mixed with Zinc.
DAP (Diammonium phosphate) is a concentrated phosphate-based fertilizer. Phosphorus is an essential nutrient along with Nitrogen and plays a vital role in the development of new plant tissues and the regulation of protein synthesis in crops.
Basal, spraying fertilizer, or broadcasting fertilizer in field mix or seeds treating, zinc sulphate fertilizer cannot be mixed with any phosphate fertilizer, as it would produce zinc phosphate that is not easily dissolved in water.