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- W1986469759 abstract "Abstract The results of an experiment to determine the water production function of sorghum for Northeast Brazilian conditions are reported. The experiment was designed in two random blocks consisting of four growth stages for irrigation deficit and four levels of nitrogen. The crop response to water was found to be of quadratic nature. Regression coefficients were developed for each nitrogen and growth stage treatment between water use and grain yields. The most critical stage was found to be the vegetative stage followed by flowering and grain formation stages. The yield response factors as according to Doorenbos and Kassam were found to vary drastically not only with different nitrogen levels and crop growth stages but also with different irrigation levels. A modified linear equation has been suggested. The coefficients of this modified equation have been determined for all four stages and for the four nitrogen levels for sorghum. The highest average water use efficiency of 109.3 kg ha −1 cm −1 of water and highest obtainable grain yield of 4.92 t/ha was found to be at 425 mm of water use and 45 kg/ha of nitrogen. The crop coefficients ( K c ) to compute crop water use from pan evaporation vary between 0.4 and 0.81 with an average for the whole growing period of 0.75." @default.
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- W1986469759 date "1986-04-01" @default.
- W1986469759 modified "2023-09-25" @default.
- W1986469759 title "Water production function of sorghum for Northeast Brazil" @default.
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- W1986469759 doi "https://doi.org/10.1016/0378-3774(86)90029-6" @default.
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