Studies on dry matter accumulation,partitioning and translocation in winter wheat under sprinkler and surface irrigation conditions

Using Zhongyou 9507 as experiment material,a field experiment was conducted to investigate dry matter accumulation,partitioning and translocation in winter wheat under sprinkler and surface irrigation conditions.The results were as follows: Compared with that under surface irrigation condition,the total amount of dry matter accumulation of the winter wheat under sprinkler irrigation condition was lower from tillering stage to jointing stage,while the total amount of dry matter accumulation under sprinkler irrigation condition was markedly higher from heading stage to mature stage.In addition,sprinkler irrigation had no significant effect on the partitioning rate of winter wheat before heading stage,however sprinkler irrigation decreased the partitioning rate of dry matter to stem and sheath,and promoted the partitioning rate of dry matter to leaf and grain,especially to grain during grain filling stage.The translocation rates of originally stored dry matter of leaf,glume,stem and sheath transporting to spike were declined under sprinkler irrigation,while the rate of dry matter accumulation after heading contributing to grain yield was increased under sprinkler irrigation.Compared with that under surface irrigation condition,the grain ripening percentage,1000 grains weight and grain yield of winter wheat under sprinkler irrigation condition increased by 5.9%,1.23 g,491.4 kg/hm2,respectively,and the differences between them were significant.Evapotranspiration was lower and water use efficiency was higher under sprinkler irrigation condition than those under surface irrigation condition.