双季超级早稻高产品种特征特性研究

摘要

以8个超级稻品种为材料，在大田条件下研究了不同产量水平的双季超级早稻品种的产量、产量构成及株型特征等。结果表明：超级早稻的产量主要受总颖花数和每穗粒数的影响，高产品种具有大穗优势。高产超级早稻品种生育后期叶面积指数高、衰减速度慢，倒1叶和倒3叶的叶基角略大于中、低产超级稻品种，使功能叶片姿态更加合理，且叶长及长宽比均优于中、低产品种，有利于在生育后期截获更多光能，从而获得高产。%The yield, yield components and plant-type characteristics of double cropping 8 super early rice varieties with dif-ferent yield levels were studied under field condition.The results showed that the yield of super early rice was mainly affected by the number of total spikelets and the number of grains per spike, and high-yielding varieties had the advantage of large spike.At latter growth and development stage, high-yielding super early rice varieties had high leaf area index ( LAI) and low decay rate of LAI, and the basic leaf angles of their flag leaf and the third top leaf were slightly bigger than those of medium-low-yielding super rice varieties, which made the pose of functional leaves of high-yielding super early rice varieties more reasonable.The leaf length and leaf length-leaf width ratio of high-yielding super early rice varieties were better than those of medium-low-yielding super rice varieties, which was beneficial to the interception and capture of more light energy at latter growth stage.