Abstract: In order to provide theoretical basis for high-yield wheat cultivation and scientific straw-returning, the experiment was conducted under field condition for two consecutive years.To investigate the effects of straw-re-turning on carbon and nitrogen assimilate translocation, wheat yield components and quality formation, an experiment of 4 treatments (Rice-straw,RS and wheat-straw,WS returning in single season, rice-wheat straw,WR returning in double season and no straw application, CK ) were executed under rice-wheat double cropping system.Results showed that straw-returning increased the redistribution amount of nitrogen accumulated pre-anthesis and the contri-bution of nitrogen accumulated pre-anthesis to grains, and the contribution rate exceeded 80%.Straw-returning de-creased the contribution percentage of total soluble sugar remobilization quantity to grain starch yield ( PSGS) in the vegetative organs to the grain, but increased the PSGS in leaves while decreased the PSGS in sheathes and stems.Grain yield components were essentially altered by straw-returning.There were a decrease of effective panicle num-ber and an incerease of kernel per spike and weight of 1000 kernels,resulting in a slight but not significant decrease in grain yield.Under straw-returning, mature grains had an increase of protein content and a decrease of starch con-tent.The main reason for decrease in total starch content is that straw-returning significantly decreased the amyl-opectin content but had no effects on the amylose content.

Key words: Wheat, StRaw RetuRning, CaRbon and nitRogen assimilate tRanslocation, Yeild foRmation

CLC Number: 

• S512.1