Effect of different fertilizer doses and bio-inoculants on yield, nutrient content and economics of summer mungbean (Vigna radiata L.)

A field experiment was conducted during summer season of 2011-12 and 2012-13 at the Agricultural Research Farm, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi (U.P.) to study the effects of fertility levels (25 and 50 kg P2O5 ha-1, 25 kg S ha-1 and 3 kg Zn ha-1) and bioinoculants (PSB, Trichoderma and PSB + Trichoderma ) on yield, yield attributes, protein content, protein yield and economics of summer mungbean. The results revealed that application of 50 kg P2O5 ha-1 + 25 kg S ha-1 + 3 kg Zn ha-1 and seed inoculation with PSB + Trichoderma recorded significantly higher grain yield and yield attributes viz., pods plant-1, grains pods-1 and 100 seed weight over other fertility levels during both the years. The combined application of PSB and Trichoderma out performed PSB and Trichoderma alone. Maximum values of yield, yield attributes, protein content and protein yield were obtained with dual seed inoculation with PSB + Trichoderma which were found significantly superior to PSB and Trichoderma alone. It was also observed that application of 25 and 50 kg P2O5ha-1along with 25 kg S ha-1 and 3 kg Zn ha-1 was found significantly superior over phosphorus alone. Increasing levels of phosphorus upto 50 kg P2O5 ha-1 increased yield and yield attributes, protein content and protein yield during both the years of study.