| The experiment was carried out to study the effects of three farming modes(Flat planting,straw mulching,plastic film-mulching) at 120 kg N/hm2 and planting density 130～150×104 plants/hm2 on sugar contents and starch accumulation in grains during grain filling of the winter wheat variety Xiaoyan 22.The results showed that sugar contents and starch accumulation varied with the farming modes.Compared with flat farming,the total soluble sugar contents and sucrose contents in straw mulching and plastic film-mulching were higher than that in flat farming during the early filling stage,while they were lower than that in flat farming during maturity stage.The starch contents in straw mulching and plastic film-mulching were higher than that in flat farming during the filling stage,and satiety index of wheat grain and the yield were all higher than that in flat farming.The results indicated that anabolism of total soluble sugar and sucrose of wheat in straw mulching and plastic film-mulching were thriving,and the total soluble sugar and sucrose were abundance in grains in straw mulching and plastic film-mulching.The degradation of total soluble sugar and sucrose of wheat in straw mulching and plastic film-mulching were thriving,and the ability of supplying and utilizing assimilate in straw mulching and plastic film-mulching were strong during grain filling stage. |