Effect of phosphorus enriched organic manures on yield and economics of onion crop in Vertisol

Abstract

The experiment was conducted at Kalagi taluka in Kalaburagi district, which belongs to the Agro-Climatic Zone-2 (North Eastern Dry Zone) of Karnataka state. The experiment was laid out in split-plot design with three main plot treatments and seven sub-plot treatments. Application of P-enriched organic manures at different levels of P-fertilizers had significantly increased the bulb yield of onion. The highest bulb yield of onion (29.38 t ha-1) was obtained with the addition of P-enriched poultry manure @ 3 t ha-1 + 100% RDF-P which was found superior to all other treatments. The increase in yield over control (no organic manure) was 20.90% in onion crop. Addition of P-enriched poultry manure with 50 per cent RDF-P was found beneficial and yielded higher monetary returns (Rs.421454 ha-1) and B:C ratio (6.80) from onion crop production.