Rainfed lowland rice: physical environment and cultivar requirements

Stomatal Responses in Rainfed Lowland Rice to Partial Soil Drying; Comparison of Two Lines

“…Droughtprone rainfed lowlands are commonly subjected to cycles of flooded, anaerobic and dry, aerobic soil conditions , the occurrence and duration of which are unpredictable. Rice crops in these ecosystems are at risk of exposure to drought stress leading to variable low yields averaging about 2.3 t ha -1 (Wade et al, 1999a). The root system is usually shallow , partly because of the restrictive effect of anaerobic soil conditions on root growth.…”

Stomatal Responses in Rainfed Lowland Rice to Partial Soil Drying ; Evidence for Root Signals

“…This is in contrast with the uplands, where the soil is not flooded and remains mostly aerobic. Additional traits may therefore be needed to cope with the anaerobic-aerobic transitions during drought in the rainfed lowlands Wade et al, 1999a). During drying periods, as water is rapidly lost from soil surface layers, plant growth and productivity are restricted through reduced availability of water and nutrients (Otoo et al, 1989;Fukai et al, , 1999bWade et al, 1998).…”

Topographic Position Influences Water Availability in Rainfed Lowland Rice at Rajshahi, Northwest Bangladesh

“…Drought is recognized as the major constraint to rice performance there (Widawsky and O Toole, 1990). Depending on the surrounding landscape, however, the hydrology of the rainfed lowlands differs greatly (Wade et al, 1999). Paddies in a high position lose water readily through surface runoff and seepage, while those in a low position may intercept that water.…”