Summary
Under intermediate deepwater condition with water depths of 15–35 cm during most of the crop growth period, sulphur coated urea and urea supergranule placement was superior to prilled urea in increasing the relative uptake and grain yield (23–25%) of rice. A semi-tall variety (CR 1016) responded better to the nitrogen application than a tall variety (CR 1030).
The crop fertilized with N produced more number of tillers and grain yield than the unfertilized crop under complete submergence for 6 days at seedling establishement stage (8 days after transplanting) followed by waterlogging of 25±5 cm throughout the crop growth period. Application of phosphorus together with nitrogen increased the grain yield (9–14%) over nitrogen alone. Crop fertilized with these two nutrients (NP) increased their uptake and yield components.
References
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Reddy, M.D., Mittra, B.N. Response of rice to different forms of urea and phosphorus fertilization under intermediate deepwater conditions (15–50 cm). Plant Soil 84, 431–435 (1985). https://doi.org/10.1007/BF02275481
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DOI: https://doi.org/10.1007/BF02275481