中韩粳稻品种产量潜力评价

 以14个中韩粳稻品种为材料，在云南省水稻高产环境下进行种植试验，对产量及其构成因素进行了方差分析、相关分析和通径分析。结果表明：参试的中国品种其产量潜力明显高于韩国品种，高2t/hm ²，相关分析表明：结实率高的品种可以获得高产。有效穗、穗粒数、结实率和千粒重对产量的直接效应为正值，其中以穗粒数的影响最大，直接通径系数为1.6437。对所有中韩粳稻品种而言，穗粒数是产量形成的主导因素，只有在稳定穗粒数的基础上，适当降低有效穗而大力改进穗部性状，即增加结实率和千粒重，可以进一步提高水稻产量的潜力。

Evaluation of the Yield Potential of Chinese and Korean Japonica Cultivars

Fourteen Japonica cultivars from Korean Rural Development Administration and Yunnan Academy of Agricultural Sciences were planted at Daying Township in Binchuan County of Yunnan province, which is a high yielding place for Japonica variety. Yield and yield components were analyzed by variance, correlation and path analysis. The results showed that the Chinese varieties got higher grain yield than Korean varieties by 2t/hm ². The variety with high seed setting rate could get high grain yield. The direct effects of the number of panicle/m ²，number of spikelets per panicle，seed setting rate and 1000 grain weight to yield were positive. The effect of the number of spikelets per panicle with the direct coefficient of 1.6437was the highest. The number of spikelets per panicle was the main effective factor to yield. Therefore, the rice grain yield potential could be increased by properly reducing the number of panicle/m² and vigorously improving seed setting rate and 1000 grain weight.