Effects of Variety and Sowing Rate on Population Quality and Yield of Direct Seeding Early Rice
A two-factor randomized block experiment was used to study the effects of different varieties and sowing rates on the population quality and yield traits of direct seeding early rice.The results showed that there were no significant differences in seedling emergence rate,seedling rate,panicle-bearing tiller rate and seed setting rate,but there were significant differences in the highest seedlings and the number of effective panicles per unit area,among the double-cropping direct seeding early rice varieties.The yield of Zhongzao 39 was the highest,which is not significantly different from that of Zhongzao 35 but significantly different from that of Xiangzaoxian 6.The number of seedlings per unit area,the number of tillers at the same period and the number of effective panicles increased with the increase of sowing rate,while the seedling emergence rate,seedling rate,tillering rate,panicle-bearing tiller rate and total spikelets per panicle decreased with the increase of sowing rate.The yield was the highest with the sowing rate of 112.5 kg/hm2,which is not significantly different from the sowing rate of 90.0 kg/hm2,but very significantly different from the sowing rate of 67.5 kg/hm2.Under the experimental conditions,the suitable sowing rate for direct seeding of Zhongzao 35 and Xiangzaoxian 6 is 112.5 kg/hm2,while the suitable sowing rate for direct seeding of Zhongzao 39 is 90.0 kg/hm2.
early ricedirect seedingsowing ratepopulation qualityyield
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