Author(s):

Vishakha B Pohare, DW Thawal and Lina D Shinde

Abstract: A field experiment was carried out at Post Graduate Institute Research Farm, Central Campus, Mahatma Phule Krishi Vidyapeeth, Rahuri, Dist. Ahmednagar (MS) during 2014-15 and 2015-16 to study the effect of integrated nutrient management on growth and yield on soybean-onion (for seed) crop sequence. The experiment was laid out in split plot design with three replications. The treatments consisted of combinations of 5 nutrient sources in main plots were applied to <em>kharif </em>soybean and 3 fertilizer levels in sub plot treatments to onion (for seed) The residual effect of the integrated nutrient sources applied to <em>kharif </em>soybean was tested in the succeeding <em>rabi</em> onion (for seed). Three fertilizer levels as sub plot treatments to onion (for seed). Application of 100 % recommended dose of fertilizer (RDF) to preceding crop reported significantly higher values for growth and yield attributes, seed yield (25.86, 27.5 q ha^-1) in soybean. The succeeding crop of onion (for seed) too showed a similar trend gross and net monetary returns and benefit : cost ratio in <em>rabi </em>onion (for seed), however, it was found at par with 50 % recommended dose of nitrogen (RDN) through chemical fertilizers (CF) + 50% recommended dose of nitrogen (RDN) through vermicompost (VC) followed by the treatment 50 % recommended dose of nitrogen (RDN) through chemical fertilizers (CF) + 50 % RDN through farmyard manure (FYM) during both the years. Among the integrated nutrient sources higher values observed with application of 50 % RDN through chemical fertilizers (CF) + 50 % RDN through vermicompost (VC) followed by 50 % RDN through chemical fertilizers (CF) + 50 % RDN through farmyard manure (FYM). Among fertilizer levels to succeeding <em>rabi </em>onion (for seed) significantly higher values registered for growth and yield attributes, seed yield ((5.05, 5.45 q ha^-1), gross and net monetary returns and benefit: cost ratio with the application of 125% RDN through chemical fertilizers (CF) over 75 % RDN through chemical fertilizers (CF) and at par with 100% RDN through chemical fertilizers (CF) during both the years. After two years completion it was concluded that, combined application of 50% RDN (25 kg ha^-1) through chemical fertilizers + 50% RDN through vermicompost (19.5 t ha^-1) or farmyard manure (46 t ha^-1) to <em>kharif</em> soybean followed by 100 per cent RDN (100 kg ha^-1) through chemical fertilizers to <em>rabi</em> onion (for seed) along with recommended dose of phosphorus and potassium to both the crops is necessary for getting higher yield in soybean-onion (for seed) crop sequence and also markedly improved the oil content in soybean. Use of FYM and VC helped in maintaining soil fertility and rhizospheric microbial population.

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