Genotypic Variation in Response of Rainfed Lowland Rice to Drought and Rewatering

Evaluation of Transplanting Date and Nitrogen Fertilizer Rate Adapted by Farmers to Toposequential Variation ofEnvironmental Resources in a Mini-Watershed (Nong) in Northeast Thailand

“…However, in this study, earlier transplanting increased yield even under a severe water stress condition in the SWd fi eld, where standing water was available for less than one month during crop season. The planted cultivars, KDML105 and RD6, have high ability of recover from water stress during vegetative growth, which is advantageous to earlier transplanting (Wade et al, 2000). The disadvantage of earlier transplanting may happen only when drought is so long and severe.…”

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

“…A split-split plot design with 4 replications was used, with two drought timings as main plots, (41 to 68 DAS and 69 to 97 DAS); two water regimes as subplots, (well-watered, with water maintained at 5 cm depth, and droughted with irrigation and rainfall excluded in the specifi ed periods); and two entries as sub-subplots, (the upland japonica line CT9993-5-10-1-M [CT9993] and IR62266). CT9993 is reported to have a deeper root system Wade et al, 2000), and is specifi cally adapted to particular drought situations in the rainfed lowlands (Wade et al, 1999b). Three-day-old pregerminated seeds of both entries were sown on 25 September 2002, at a 25 cm by 25 cm spacing.…”

Genotypic Variation in Response of Rainfed Lowland Rice to Prolonged Drought and Rewatering

“…Previous studies have examined how deep root development, water extraction, leaf growth, osmotic adjustment, and shoot biomass production are affected by drought and rewatering Banoc et al, 2000a,b;Wade et al, 2000;Kamoshita et al, 2000Kamoshita et al, , 2001. In the present study we compared these plant responses under two different lengths of drought periods (shorter and prolonged) and after rewatering.…”

“…The greater shoot biomass retained by the end of the drought periods in NSG19 and KDML105 would have been advantageous for increasing transpiration more rapidly after rewatering. Wade et al (2000) and Mitchell et al (1998) pointed out the importance of leaf area and leaf biomass at the end of the drought period for superior drought recovery.…”