不同育秧方式和插植密度下晚籼稻群体动态结构的研究

不同育秧方式和插植密度下晚籼稻群体动态结构存在差异。旱育秧群体分蘖速度快,分蘖能力强。稀植可促进个体分蘖多发、有效穗数增多,但旱育稀植并无分蘖早发的优势。旱育稀植使主茎基部叶片变短而上部叶片变长,生育后期叶面积消长平稳,地上部干物质积累较多。旱育秧、稀植都使主茎叶总数增多,全生育期延长。

STUDIES ON DYNAMIC STRUCTURE OF THE LATE INDICA RICE POPULATION WITH DIFFERENT SEEDLING RAISING MEASURES AND PLANTING DENSITIES

There were differences in the dynamic structure of the late indica rice population among various seedlings raised with different measures and transplanting densities, i.e sparse transplanting of dry-nursery raised seedlings, close transplanting of dry-nursery raised seedlings, sparse transplanting of wet-nursery raised seedlings and close transplanting of wet-nursery raised seedlings. The rice population transplanted with dry-nursery seedlings had larger tillering rate and stronger tillering ability. Sparse transplanting of dry-nursery seedling (STD) could accelerate the seedling tillering and increase productive panicles, but didn't have the advantage of early tillering occurance. In comparison with other treatments, STD could also make the leaves in the base of main culm shorten, the upper leaves lengthen, make the changes of leaf area index stable at the late growth stage, and lead to the more dry matter accumulating in shoot and more leaf number on the main culm as well as the longer growth duration.