氮肥运筹和烯效唑对小麦干物质和氮积累的影响

The effect of N applied methods and uniconazole on dry matter production and N accumulation in wheat。

在非倒伏条件下，研究了不同氮肥运筹方法和植物生长调节剂处理对小麦干物质生产与分配，植株氮浓度与积累量和产量性状的影响．结果表明，Ｓ３３０７显著降低各种氮肥运筹方法的干物质生产，最终造成籽粒产量降低．ＧＡ３和Ｓ３３０７混合使用可部分消除Ｓ３３０７的生长抑制作用．总用氮量相同，各生育期追施比例不同，对考察的大多数性状有显著的效应，基肥足（６０％）和重施拔节肥（４０％）的两次施肥法，干物质生产和氮素积累多，花期叶片叶绿素含量高，单株穗重较大，籽粒产量高。

The effect of three N applied methods and spraying plant growth reguraters(PGRs) on dry matter production and its distribution, nitrogen concentration and accumulation in wheat plants, and yield characters was studied under no lodging condition. It was shown that uniconazole(S 3307 )reduced dry matter production and grain yields in all N applied methods, While conbinational application of GA 3 and S 3307 could modify some inhibition of growth by S 3307 . Different ratio of dressing fertilizer during wheat growth, given the same total quantity of N fertilizer,had the significant influence on the most of characters observed. The N applied method 6040, in which 60% of N fertilizer was used before sowing and 40% used in stem elongating stage, had the largest dry matter production and N accumulation, and higher chlorophyll content of leaf at flowering and the highest grain weight per plant and grain yield, suggesting that it was a recommendable N applied method with the advantage of labour cost and high yield.