Performance of anaerobically direct seeded-rice plants in the Mekong Delta, Vietnam
1994
Chau, N.M. | Yamauchi, M. (Cuu Long Delta Rice Research Inst. (Viet Nam))
Number of seedlings established was higher for anaerobic cultivars than for checks. Yields of BR1870-67-1-3 and BR736-20-3-1 were the same as those of the checks, and higher than those of IR52341-60-1-2-1, IR31802-48-2-2-2, and IR41996-50-2-1-3. Difference in yield was due to the difference in total dry matter (TDM) accumulation at maturity and not in harvest index (HI). BR1870-67-1-3 and BR736-20-3-1 had large panicle size, indicated by the high spikelet number/panicle. Although BR1870-67-1-3 and BR736-20-3-1 had more spikelets/sq.m., they did not outyield checks significantly because their 1,000-grain weights were small. Correlation analysis showed that the grain yield highly correlated with TDM accumulation at flowering and harvest, spikelets/panicle, spikelets/sq.m., and leaf area index (LAI) at flowering. The significant correlation between spikelets/sq.m. and spikelets/panicle (r=0.98** ) indicated that big panicles are important for obtaining a large number of spikelets per unit land area. The yield recorded for BR1870-67-1-3 was higher than the mean (4.3 t/ha) for the past 7 yrs at CLRRI during the wet season under transplanting (80-25-18 kg NPK/ha). The physiological and morphological traits required for high-yielding direct seeded rice in the Mekong Delta in the wet season seem to be high TDM accumulation at flowering and harvest, LAI at flowering of about 4, and large panicle size. These characters may be considered when breeding rice for direct seeding in the Mekong Delta
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