National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
A field experiment was conducted during kharif (soybean), 2012 and rabi (onion) 2012-13 in a sandy clay loam soils of college farm, College of Agriculture, Rajendranagar, Hyderabad to study the response of P levels (0, 30 and 60 kg P2O5 ha-1) either alone or in combination with PSB @ 5 kg ha-1, biochar @ 5 t ha-1, humic acid @ 20 kg ha-1 and citric acid @ 10 mM concentration to study the direct, residual and cumulative effects of the treatments imposed on yield of soybean (direct) and onion (Residual and Cumulative), soybean equivalent yield (Residual and Cumulative) and benefit : cost ratio of soybean (direct) and onion (Residual and Cumulative). The mean seed yield of the soybean with biochar was 2077 kg ha-1 which was significantly higher against the control seed yield of 1329 kg ha-1. Biochar resulted in a significant increase in mean onion yield to 22.1 t ha-1 against 15.8 t ha-1 when organics were not supplemented, the yield response being 39.9 per cent across inorganic P and mode of effect. Yield of soybean - onion cropping sequence was higher with biochar and humic acid when applied along with 30 kg P2O5 ha-1 with corresponding soybean equivalent yields of 7063 and 6740 kg ha-1. For soybean-onion cropping sequence, residual effect of 30 kg P2O5 ha-1 + humic acid was economically better with higher B: C ratio of 2.0 followed by 30 kg P2O5 ha-1 + biochar in both residual and cumulative effects which showed 1.9.
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