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). | Residual and cumulative effects of organic and inorganic P on economics of soybean Glycine max L. - Onion Allium cepa L. cropping sequence in a high P alfisol
