地膜旱管稻密度对产量及群体质量的影响

Effects on Yield and Population Quality of Compact Planting Rice in Dry Cultivation Mulched with Plastics

通过杂交稻汕优 5 5 9不同密度试验 ,探讨了地膜旱管稻密度对产量及其构成因素的影响 ;分析了密度与分蘖成穗率、粒叶比、干物质生产量等群体质量指标的关系。研究结果表明 ,密度与产量呈抛物线型的曲线变化关系 ,过大或过小都会因成穗数、穗粒数的变化而影响产量。汕优 5 5 9适宜密度为 18.0～ 19.5万穴 /hm2 ,其分蘖成穗率高、粒叶比大、中后期干物质生产能力强 。

The different population treatments were conducted to inquire into the effect on yield and population quality in dry cultivation rice mulched with plastics,with hybrid rice Shanyou 559. The results were as follows: the relation between population and yield took on parabola-shaped curve, too high or low populotion could affect yield because of the change of the quality of ear bearing tiller. The moderate population of Shanyou 559 is 180,000～195,000 holes per hm 2, which had higher percentage of ear bearing tiller, higher ratio between grain and leaf and higher production capacity for dry matter in mid-late growth stage, therefore resulted in higher yield.