Effect of NPK Fertilizers, Farmyard Manure (FYM) and Bio-fertilizers on Quality Parameters of Onion (Allium cepa L.) Grown in Jaipur, Rajasthan

The current experiment was conducted in loamy sand soils of the Horticulture farm, Vivekanand Global University Jaipur, during Rabi season of 2020-21 and 2021-22. The experiment comprised of 32 treatment combinations replicated three times, was laid out in split-plot design (SPD) with four fertility levels of NPK (0, 50, 75 and 100% of recommended dose of NPK) and two levels of FYM (without FYM and with FYM @ 25 t ha-1 were added in main plots. Four bio-fertilizer levels (No inculcation N2 fixer Azotobacter, PSB inculcation and N2 fixer Azotobacter + PSB inoculation) were added in sub plots. The results of the study have clearly shown that application of chemical fertilizer up to 100% RDF increased all the quality attributes (pungency, chlorophyll content and TSS), NPK and S content and uptake and availability of N, P and K in soil after harvest the crop. With application of FYM @ 25 t ha-1 significantly improved all quality attributes (Allyl propyl disulphide, chlorophyll and TSS), N, P, K and S content and uptake and availability of N, P and S in soil after harvest the crops. Use of biofertilizers (N2 fixers and PSB) alone or in combination increased all the quality attributes (Allyl propyl disulphide, chlorophyll and TSS content), NPK and S content and uptake and availability of N, P and K in soil after harvest the crop.