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Interplay of phosphorus doses, cyanobacterial inoculation, and elevated carbon dioxide on yield and phosphorus dynamics in cowpea
- Dey, Sumit Kumar, Chakrabarti, B., Purakayastha, T. J., Prasanna, Radha, Mittal, R., Singh, S. D., Pathak, H.
- Environmental monitoring and assessment 2019 v.191 no.4 pp. 223
- acid phosphatase, alkaline phosphatase, carbon dioxide enrichment, cowpeas, enzyme activity, inorganic phosphorus, microbial activity, nitrogen fixation, nutrient availability, regression analysis, seed yield, soil
- Phosphorus (P) demand is likely to increase especially in legumes to harness greater benefits of nitrogen fixation under elevated CO₂ condition. In the following study, seed yield and seed P uptake in cowpea increased by 26.8% and 20.9%, respectively, under elevated CO₂ level. With an increase in phosphorus dose up to 12 mg kg⁻¹, seed yield enhanced from 2.6 to 5.4 g plant⁻¹. P application and cyanobacterial inoculation increased the microbial activity of soil, leading to increased availability of P. Under elevated CO₂ condition, microbial activity, measured as dehydrogenase, acid phosphatase, and alkaline phosphatase activities showed stimulation. Soil available P also increased under elevated CO₂ condition and was stimulated by both P application and cyanobacterial inoculation. Higher P uptake in elevated CO₂ condition led to lower values of inorganic P in soil. Stepwise regression analysis showed that aboveground P uptake, soil available P, and alkaline phosphatase activity of soil influenced the yield while available P, and organic and inorganic P influenced the aboveground P uptake of the crop. This study revealed that under elevated CO₂ condition, P application and cyanobacterial inoculation facilitated P uptake and yield, mediated through enhanced availability of nutrients, in cowpea crop.