Yield potential of transplanted and wet seeded rice in high-yield environments in the Philippines
1995
Garcia, F.V. | Peng, S. | Cassman, K.G. (International Rice Research Inst., P.O. Box 933, 1099 Manila (Philippines))
The growth characteristics, yield, and yield components of wet seeded (WSR) and transplanted (TPR) rice were compared across a wide range of N levels using two cultivars at two locations. Panicle initiation, flowering, and physiological maturity were 1 wk earlier in WSR than in TPR when seeds were sown on the same day in the 1993 dry season. WSR also had faster leaf area development and dry matter accumulation than in TPR. With adequate N supply, N uptake was higher in WSR than in TPR from early growth to flowering but only at midtillering without added N. Without added N, WSR had significantly lower grain yield than TPR. Although total spikelet numbers were similar, WSR had more panicles, fewer spikelets per panicle, and lower percent filled grain than TPR. With adequate N supply, WSR produced more panicles than TPR, but due to lower leaf N content and perhaps an unfavorable N distribution in the canopy of WSR, filled grains per m2 were similar in both establishment methods. Therefore, yields were similar, ranging from 8.1 to 9.9 t/ha in the dry season and from 5.1 to 6.3 t/ha in the wet season. Under conditions of excess N supply, WSR yielded less than TPR because of its greater susceptibility to lodging
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