水稻不同产量水平干物质积累、分配与产量关系的研究

A Trial on the Relationships between Accumulation,Distributionof Dry Matter and Grain Yield of Rice Under Different Yield Leve

本试验设计７５００ｋｇ／ｈｍ２和９５００ｋｇ／ｈｍ２两种产量水平试验田，研究水稻干物质积累、分配与子粒产量间的关系。结果表明：不同产量水平间总干物质的积累有明显的差异，子粒产量与干物质积累量呈正相关；水稻生长过程中，光合产物主要分配给当时的生长中心，即生育前期分配给营养器官，中期向生殖器官转移，直至后期分配给生殖器官；不同产量间各器官的含Ｎ率有明显差异，产量越高，器官含Ｎ率越高。

In order to study the relationships between accumulation. distribution of dry matter and grain yield of rice two kinds of different yield level experimental fields 7 500 kg/hm2 and 9 500 kg/hm2 were designed,and the results showed:total dry matters accumulation were obviously different among different yield levels , there were significant positive correlations between yield and dry matter accumula- tion;In the period of rice growth phase,the photosynthate mainly supplied to growing centre at that time,that is to say:at primary growing stage,the photosynthate supplied to the vegetative organs,in the middle of growing stage , it transfered to reproductive organs and up to organs of the later stage ; there were significant difference of N content rate of each organ among different yields , the more yield was , the more N content rate of organ .