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《Journal of Anhui Agricultural Sciences》 2008-02
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Influences of Planting Density on the Yield and Its Composing Factors of Two Rice Varieties

YAN Ming-jian et al (Three-gorge Agricultural Science Institute in Chongqing, Chongqing 404001)  
[Objective] The aim of the study was to confirm suitable planting density of high-yield cultivation for rice with different growth periods. [Method] 6 planting densities of 90 000, 135 000, 172 500, 225 000, 256 500 and 321 000 nests/hm2 were set up to study the tillering dynamics and yields of Yixiang 481 (P1) with long growth period and 101A/R1007 (P2) with short growth period. [Result] Along with the decrease of density, the rice tiller quantity per nest increased correspondingly in tillering peak stage of P1. The tiller quantity of P2 planted thinly was more and that of P2 planted thickly was less. Along with the increase of density, the highest tillering periods of the 2 varieties advanced. Their available ear number per plant decreased and showed simple linear correlation. P1 got highest available ear number (241 200 0/hm2) and highest yield (10 281.6 kg/hm2) at 172 500 nests/hm2. P2 got highest available ear number (277 050 0/hm2) and highest yield (9 631.5 kg/hm2) at 225 000 nests/hm2. The full grain number per ear had biggest influence on the yield of P1 and available ear number was secondary. Increasing available ear number could increase the yield of P2 significantly. [Conclusion] The variety with long growth period can get perfect available ear number under relatively thin planting. Properly increasing planting density for the variety with short growth period was in favor of enhancing available ear number.
【Fund】: 重庆市科委资助项目
【CateGory Index】: S511
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