Vol. 1, Issue 1, Part A (2019)

The experimental layout was done in a randomised block design (RBD) with nine treatments replicated three times. Treatments were assigned randomly which consisted of three levels of potassium i.e. 0, 25 and 50 kg ha^-1 and three levels of sulphur i.e. 0, 15, 30 kg ha^-1. The results indicated that the maximum average plant height (76 cm), bulb length (5.8 cm), bulb diameter (7.8 cm), total bulb yield *(13.55 t ha^-1) showed significantly better results with the treatment T₈ (potassium at 100 kg ha^-1 and sulphur at 100 kg ha^-1 ). The same treatment also showed better results in the physical properties of the post-harvest quality of the soil like increase in % pore space, decrease in bulk and particle density of the soil and also showed a gradual decrease on the chemical properties of the soil like decrease in pH, OC % and N, P, K, S values in the soil after harvest. Hence the results revealed that the treatment combination T₈ i.e. potassium at 100 kg ha^-1 and sulphur at 100 kg ha^-1 with a cost benefit ratio of 1:4.88 was found to be the most beneficial and significantly improved the growth parameters and bulb yield of onion grown under Prayagraj Agro climatic conditions.