窄畦窄行穴播大豆群体生理指标及光分布特点

采用大区对比法对窄畦窄行穴播大豆各生育阶段群体生理指标及冠层光分布特点进行了分析。结果表明：与传统的宽畦宽行穴播相比，窄畦窄行穴播大豆群体ＬＡＩ高，叶片功能期长，相对光强高；在鼓粒期（Ｒ５），降低了叶片密集点所处的高度，减小了叶片密集度和消光系数，改善了整个冠层的光照条件，提高了净光合生产率，积累了更多的干物质，从而使籽粒产量提高了１７．８％。

The physiological parameters of population and light distribution in the canopy of soybean by sowing in hole with close drill and narrow ridge

The relevant physiological parameters of population and the characteristics of light distribution in the canopy were analyzed with comparative exeperiment at different growing stages of soybean by sowing in hole with close drill and narrow ridge (SHCDNR). The result showed the cultivating pattern (SHCDNR) had higher LAI of population, longer period of functional leaf and higher relative light intensity in the canopy, compared with traditional sowing in hole with broad drill and wide ridge. During the seedfilling stage (R 5), the height of seat of leaf collection, the degree of leaf collection and the extinetion coefficient (K) were decreased. As a result, the cultivating pattern improved the condition of light intensity, increased NAR and accumulated much more dry matter of population part above soil surface, The seed yield was 17.8% higher than that in the traditional cultivating pattern.