Increased lowland rice yield through improved fertilizer and water management practices [Philippines]
1987
Aragon, E.L. | De Datta, S.K. | Buresh, R.J. | Evangelista, R.C. (International Rice Research Inst., Los Banos, Laguna (Philippines). Dept. of Agronomy)
Nitrogen (N) sources and application methods were evaluated under irrigated and simulated rainfed lowland rice cultures. Rices were subjected to varying moisture stress at the vegetative stage in one test and at the reproductive stage in another. Deep-placed urea supergranules (USG) gave the highest number of panicles per unit area, dry matter, total N uptake, and grain yield regardless of water regime. Researchers split of prilled urea (PU) gave comparable results while farmer's practice was inferior. With any N treatment, plots not irrigated for about three weeks at the vegetative stage generally yielded higher compared to continuously flooded plots. This was due to higher mineralization of N in stressed plots. Poor root and shoot growth, lower grain-straw ratio, increased sterility, and decreased 1000-grain weight resulted from reproductive moisture stress. Nitrogen application aggravated the effects of moisture stress. Results showed that mild moisture deficit at the vegetative stage was beneficial to the rice crop but detrimental at the reproductive stage.
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