Comparative performance of phosphate solubilizers with varying phosphorus levels in wheat under mollisols of Uttarakhand
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Date
2022-09
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G. B. Pant University of Agriculture and Technology, Pantnagar
Abstract
A field experiment was conducted during Rabi season of 2021-22 at Norman E. Borlaug Crop Research Centre of Govind Ballabh Pant University of Agriculture & Technology, Pantnagar (Uttarakhand) to evaluate the effect of phosphate solublizers under different P levels on wheat growth, yield attributes, yield, nutrient accumulation, and economics of wheat. The soil of the experiment site was sandy loam in texture having medium organic carbon (0.77%), low available nitrogen (167.3 kg/ha), medium available phosphorus (15.6 kg/ha) and low available potassium (166.1 kg/ha). Soil reaction was neutral (pH 7.10). The experiment consisted of 12 treatments, having three P levels (0, 50 and 100% as 0, 30 and 60 kg P2O5/ha) and four P solublizers (control, humic acid (HA) @ 10 kg/ha, phosphorus solublizing bacteria (PSB) @ 10 g/kg seed and HA @ 10 kg/ha + PSB @ 10 g/kg seed) and was laid in factorial randomized block design with three replications. The wheat variety HD 2967 was sown on 12th of November at 22.5 cm row spacing and with seed rate of 100 kg/ha. All the recommended package of practices except treatments was adopted in the experiment.
100% P led to a significant increase in plant height, tiller count and dry matter accumulation, NDVI and SPAD values compared to 50% P and control. Significantly higher grain, straw and biological yield, net return, B: C ratio was recorded with 100% P compared with 50% P application and control. The statistically higher plant height, tiller count and dry matter accumulation were found with HA + PSB application compared to sole application of PSB and control. Significantly higher grain straw and biological yields, and net return was found under HA + PSB compared to sole application of HA, sole PSB and control. A decrease in B: C ratio was observed with sole HA compared to PSB. Post-harvest soil P, plant P concentration and its uptake were also significantly higher in HA + PSB compared to sole application of HA, sole PSB and control. An increase of 3.7-6.9% in post-harvest soil P and 5.7-12.1% in plant P uptake was recorded with the application of HA + PSB compared to the other P solubilizers.
100% P with HA and PSB lead to statistically greater growth, grain yield, grain P content, total P uptake, post-harvest soil P, net return and benefit-cost ratio compared to other treatments. The spikes at harvest, grain yield and grain P content, total P uptake and post-harvest soil P obtained at 50% P with HA + PSB was statistically comparable to 100% phosphorus.
It can thus be concluded that application of 100% P with HA and PSB lead to statistically greater growth, grain yield, grain P content, total P uptake, post-harvest soil P, net return and benefit-cost ratio compared to other treatments. Grain yield obtained in 50 % P with HA + PSB was statistically similar with 100% P.