Vol. 6, Special Issue 4 (2018)
Response of added P, S and microbial inoculant on biological nitrogen fixation and yield of soybean
Author(s): Sonal Kumari, DK Shahi, P Mahapatra, AK Singh and Satish Kumar Pandey
Abstract: A field experiment was conducted at experimental farm of Birsa Agricultural University during the kharif season, 2016 to study the response of added P, S and microbial inoculant on biological nitrogen fixation and yield of soybean with 18 treatment combinations having two levels of inoculation (I0 and I1), three levels of phosphorus (P40, P60 and P80 kg ha-1) and three levels of sulphur (S0, S15 and S30 kg ha-1) in a split-split plot design replicated thrice. The soil of the experimental site was sandy clay loam in texture having good drainage and fairly moisture retention capacity with acidic pH (5.2), EC (0.08dS m-1), low in organic carbon (2.6 g kg-1),CEC (8.5 cmol (p+) kg-1), total nitrogen (0.157%) and available nitrogen (181.5 kg ha-1), medium in available phosphorus (23.9 kg ha-1) and available sulphur (17.0 ppm) was above the critical range. Microbial population in initial soil was 29.33×104 Propagules g-1, 22×106 CFU g-1, 8.9×106 CFU g-1 for fungi, bacteria and actinomycetes, respectively. The results revealed that different levels of phosphorus and sulphur along with microbial inoculation significantly influenced the nodulation parameters and yield such as number of nodules (33.0plant-1), fresh weight of nodule (0.69 gplant-1) and dry weight of nodule (0.31 gplant-1) were recorded maximum with application of phosphorus @ 80 kg P2O5 ha-1while having statistical equivalence with 60 kg P2O5 ha-1 for number of nodules per plant. BNF and yield of soybean remarkably increased with increasing doses of phosphorus and recorded maximum of 84.0 kg ha-1, 24.0 q and 27.1 q ha-1 BNF, grain and straw yield, respectively with 80 kg P2O5 ha-1. Application of 30 kg S ha-1 was found equally effective with application of 15 kg S ha-1 in respect to number of nodules, fresh weight, dry weight of nodule and grain yield and recorded maximum value of 31.4plant-1, 0.67 gplant-1 and 0.30 gplant-1, and 23.6 q ha-1, respectively with application of 30 kg S ha-1.BNF increased with increasing doses of sulphur and recorded maximum of 77.0 kg ha-1 with 30 kg S ha-1. Microbial inoculation significantly increased the number of nodules (34.0plant-1), fresh weight (0.69 gplant-1), dry weight of nodule (0.30 gplant-1), BNF (83.4 kg N ha-1), grain yield (23.4 q ha-1) and straw yield (26.4 q ha-1).
Pages: 199-202 | 615 Views 59 Downloads
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How to cite this article:
Sonal Kumari, DK Shahi, P Mahapatra, AK Singh and Satish Kumar Pandey. Response of added P, S and microbial inoculant on biological nitrogen fixation and yield of soybean. International Journal of Chemical Studies. 2018; 6(4): 199-202.
