不同育秧方式和插植密度下晚籼稻冠层的透光率比较试验

以籼型水稻特三矮为材料,初步研究了水、旱育秧方式和不同基本苗插植密度下生长过程中晚季籼稻冠层的透光率。研究表明:单苗移植的透光率的下降速度高于多苗移植;旱育秧移植的透光率下降速度大于水育秧移植;遮阴生长的其透光率大于不遮阴的。自幼穗分化期起至黄熟期,四种育秧移栽方式的透光率基本相同。

LIGHT TRANSMITTANCE THROUGH CANOPY OF LATE INDICA RICE TREATED BY DIFFERENT SEEDLING RAISING METHODS AND PLANTING DENSITIES

Light transmittance through canopy of indica rice Tesan-ai at different growth stages was measured at 5cm above ground. Rice seedlings raised from dry and wet nurseries were transplanted by different densities. The results indicated that during the plant development, light transmittance through canopy of rice planted by single seedling was reduced more than that by multi-seedlings, and that of rice from dry nursery was also decreased as compared with that from wet nursery. Light transmittance through canopy of rice planted without shading was less than that under shading by black plastic film. The light transmittance for four cultivation methods were similar in the development of rice from panicle differentiation period to maturation period.