Response of rice and wheat to phosphorus at different ESP [exchangeable sodium percentage] levels
1994
Hussain, K. | Mehdi, S.M. | Niazi, M.H.K. (Soil Salinity Research Inst., Pindi Bhattian (Pakistan)) | Ismat, N. (University of Agriculture, Faisalabad (Pakistan))
A pot study was conducted on rice and wheat crops to see their responses to P application at two ESP levels (18 and 34). Phosphorus as SSP was applied at the rate of 0, 13, 20, 26 and 0, 11, 22, 33 mg per kg soil to rice and wheat, respectively. A basal dose of N and K was also applied. Grain/ straw yields and productive tillers in rice and straw yield and productive tillers in wheat were increased significantly with P application. Wheat grain yield was not changed. With increasing ESP wheat straw yield and productive tillers in both the crops were not affected. However, rice straw yield and grain yield of both the crops decreased by increasing ESP. Phosphorus content and its uptake by both the crops (grain and straw) increased significantly with P application. ESP did not affect P concentration. But P uptake decreased with increasing ESP significantly. Interaction between ESP and P application affected straw yield of wheat and P uptake by rice and wheat. The most economical dose both for rice and wheat was recorded as 20 to 22 mg P per kg soil, respectively.
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