Your search found 5 records
1 de Datta, S. K.; Krupp, H. K.; Alverez, E. I.; Modgal, S. C. 1973. Water management practices in flooded tropical rice. In International Rice Research Institute, Water management in Philippine irrigation systems: Research and operations (pp. 1-18). Los Banos, Laguna, Philippines: International Rice Research Institute.
Water management ; Cropping systems ; Water use efficiency ; Clay ; Rice ; Weed control ; Pest control ; Furrow irrigation ; Puddling / Philippines
(Location: IWMI-HQ Call no: 631.7.6 G732 INT Record No: H06)
Experiments conducted for several cropping seasons on the montmorillonitic Maahas clay soil at the IRRI farm demonstrate that continual flooding is not essential for high grain yield but flooded rice can tolerate at least 15cmif the improved varieties are grown. Tall varieties like H-4 has less adaptability under wide range of water management conditions than semidwarfs like IR8. With adequate water supply, 5 to 7 cm of water is desirable on most soils for best weed and insect control with granular chemicals, forhigh nutrient availability, and for minimum losses of nutrients from fertilizer and soil. If rainfall does not provide supplemental water, irrigation intervalslonger than 8 days reduce grain yield under a rotational irrigation system. Varieties like IR5 that have a long growth duration were least sensitive to moisture stress imposed by long irrigation intervals. This is because IR5 will generally recover from high moisture stress for a short period or low moisture stress for a long period. An experiment with IR20 indicates that the furrow irrigation of nonpuddled soil does not provide more efficient water use in rice compared with rice grown on puddled lowland soil.
2 de Datta, S. K.; Abilay, W. P.; Kalwar, G. N. 1975. Water stress effects in flooded tropical rice. In International Rice Research Institute, Water management in Philippine irrigation systems: Research and operations (pp. 19-36). Los Banos,Laguna, Philippines: International Rice Research Institute.
(Location: IWMI-HQ Call no: 631.7.6 G732 INT Record No: H07)
Moisture stress often limits economical and stable yields of rainfed rice. On the montmorillonitic Maahas clay soil, grain yields of IR8 were less sensitive to growth stage at which moisture stress occurred and more sensitive to intensity and duration of moisture stress, while the tall variety, H-4,was sensitive to moisture stress during the reproductive and ripening stages as well as to intensity and duration of moisture stress. Our data indicate that moisture stress effects should be related to variety rather than to varietal type growth characteristics of rice varieties. The growth duration of rice varieties were increased with increased stress level and the relationships between moisture stress and stage of the crop may depend on growth duration of the variety among other factors. Current results indicate that soil moisture tension as low as 15 cb was enough to reduce grain yield of rainfed flooded (lowland) rice. Part of the reduction in grain yield due to the loss of nitrogen under alternately dry and wet conditions which prevailed in the plots subjected to various stress levels. The improved varieties, IR20, IR22, and IR24, consistently out yielded the traditional varieties Peta, Sigadis, and Intan, at all stress levels up to 33 cb. At most stress levels, however, the grain yields were higher with higher nitrogen levels, and more so with improved varieties than with traditional varieties.
3 Selt, L. S.; de Datta, S. K.. 1988. The impact of water management practice in rice production on mosquito vector propagation. In IRRI; WHO/FAO/UNEP Panel of Experts on Environmental Management for Vector Control - Vector-borne disease control in humans through rice agroecosystem management: Proceedings of the Workshop on Research and Training Needs in the Field of Integrated Vector-Borne Disease Control in Riceland Agroecosystems of Developing Countries, Los Banos, Philippines, 9-14 March 1987: Los Banos, Philippines: IRRI. pp.67-83.
(Location: IWMI-HQ Call no: 631.7.5 G000 IRR Record No: H05535)
4 de Datta, S. K.; Kerim, M. S. A. A. A. 1974. Water and nitrogen economy of rainfed rice as affected by soil puddling. Soil Science Society of America Proceedings, 38(3):515-518.
(Location: IWMI-HQ Call no: P 500 Record No: H022183)
5 de Datta, S. K.. 1986. Technology development and the spread of direct-seeded flooded rice in Southeast Asia. Experimental Agriculture, 22:417-426.
Rice ; Paddy fields ; Flood irrigation ; Fertilizers ; Nitrogen ; Weed control ; Economic aspects / South East Asia / Malaysia / Philippines / Thailand / Bangladesh / India / Sri Lanka / Muda
(Location: IWMI-HQ Call no: P 545 Record No: H022187)
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