Review on the effect of nitrogen and phosphorus fertilizer rates on seed yield of onion (Allium Cepa L.)

Onion is an herbaceous biennial monocot cultivated as annual. In most research the greater seed yield in onion cultivars used to be due higher range of stalks per plant and a wider umbel diameter which had been influenced through utility Nitrogen Phosphorus fertilizers. The wide variety flower opening on every day was by using hours sunshine attention phosphorous nitrogen. remedies tended decrease bolting percentages. extended nitrogen nutrient answer improved where produced. impact early dressings N crops grown underneath stipulations when nights are turning into cooler shown permit plants reach ‘bolting inducible’ stage growing season. flowering via application P fertilizer fact that phosphorus involvement metabolic physiological activities. best possible costs 115 147 kgha−1 gives well boom yield. There response onions fertilization 0-52 kg ha-1. improves uptake from soil. Too lots level influences suppressing iron, potassium Zink.