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Relation Between Axillary Bud Growth and Matter Accumulation of Stem-Sheath After Heading of Main Crop in Hybrid Rice

XU Fuxian; XIONG Hong; HONG Song(Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences, Luzhou 646100)  
The relation between axillary bud growth and matter accumulation of stem-sheath after full heading o f main crop were studied with hybrid rice combinations Shanyou 63, K-you 3 and K-you 5 in 1993-1995. During 15 days after full heading of main crop, most of photosynthates were transported to panicles, their axillary buds were stretched slowly under well light and N applied condition. At 20 days after full heading, or the grain filling at about 90% level, more photosynthates of the main crop were transported to their stems, the axillary buds were stretched quickly and effect of improving light condition as well as N application for accelerating axillary buds growth were appeared. Highly significant negative correlations were observed between the grain filling rate of main crop and stretching rate of their axillary buds, between amount of dry matter accumulation of panicles with harvest index of main crop and length of the axillary buds.
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