Comparative drought response of dry seeded, wet-seeded, and transplanted rice
1996
Boling, A. | To Phuc Tuong | Singh, A.K. | Wopereis, M. | Kropff, M. (International Rice Research Inst., P.O. Box 933, 1099 Manila (Philippines))
Dry-seeding has been identified as an option for increasing cropping intensity and productivity in rainfed ricelands. A greenhouse experiment was conducted in 1994 dry season at IRRI to compare the transpiration and biomass production of dry-seeded (DSR) with wet-seeded (WSR) and transplanted (TPR) PSB Rc 14. Temporary drought was imposed at midtillering, panicle initiation, and heading until plant had 25 percent dead leaves and green leaves registered a score of 5. Transpiration was measured daily and plant samples were taken at 7, 14, 21, 28, 42, 49. 72, 91 DAS and at harvest in well-watered plants and in those subjected to drought at different stages. Potential transpiration of DSR was not significantly different from WSR, but was significantly higher than TPR throughout the growing season. Under stressed condition and at the same saturation ratio (i.e. soil water content divided by saturated soil water content). DSR had higher transpiration compared with WSR and TPR. Total dry matter of well-watered DSR was significantly higher than WSR taken at 7 DAS and TPR at 14-72 DAS. Total dry matter of DSR subjected to drought at mid-tillering was not significantly different from WSR but it was significantly higher than TPR at 49, 72 and 91 DAS. DSR yield, despite the relatively longer drought exposure was not significantly different from WSR and TPR. Thus, DSR can withstand a longer drought period and can increase yield stability in rainfed rice ecosystems
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