PRODUCTIVITY AND SOIL FERTILITY STATUS AS INFLUENCED BY INTEGRATED USE OF BIO-FERTILIZERS, ORGANIC MANURES AND INORGANIC FERTILIZERS IN ONIONS. S. V. Raju, P. K. Nagre, N. Bharathi3 and Prasanth Naik
A field experiment was carried out on black soil during rabi (cool season) of 2009-2010 at Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola in India to evaluate the integration effect of chemical fertilizers, organic manures and bio-fertilizers on yield and soil fertility status in onion. The increased onion bulb yield and soil fertility can be obtained in integrated use of inorganic, organic and bio-fertilizer rather exclusive application of inorganic and organic fertilization, thereby saving the nitrogen application up to 25%. Productivity indicated by yield and soil fertility indicated by available NPK in soil after harvest. Out of 14 treatments studied (Table 1) significantly maximum bulb yield (416.04 q ha-1), Nutrient uptake by plant (114.93, 33.59, 84.22 kg ha-1) and available NPK in soil after harvest (234.83, 30.89, 386.42 kg ha-1) respectively, was obtained in the treatment receiving 75 % RDF + 1.65 t ha-1 VC + 5 kg ha-1Azotobacter + 5 kg ha-1 PSB, which was significantly superior over other treatments followed by T12. The treatment receiving without any fertilization was significantly inferior in yield and fertility status over other treatments. VC is a better source of Nitrogen and a good carrier material for Azotobacter and PSB over the FYM for yield and soil productivity. The total N uptake was highly and significantly correlated with the Productivity.
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