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1 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.
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