氮肥运筹对免耕高留茬抛秧稻干物质积累、运转和分配的影响

以"富优1号"为材料,通过大田试验设置不同施氮量和氮肥配比研究了氮肥运筹对免耕高留茬抛秧稻干物质积累、运转与分配的影响。结果表明,随着施氮量的增加,日产干物重和各生育时期的干物质积累量增大;干物质在叶片中的分配率随施氮量的增加而增加,而在茎鞘和穗中的分配率则随施氮量的增加而降低;干物质在叶片中的分配率以10∶0∶0和7∶3∶0的氮肥配比处理较7∶0∶3和4∶3∶3处理高,在穗中的分配率则是后两者较前两者高。

Effects of Nitrogen Strategies on Dry Matter Accumulation,Transformation and Distribution of Broadcasted Rice among High Standing-stubbles under No-tillage Condition

The field experiment was conducted using hybrid combinations FuyouⅠas material,and effects of different nitrogen levels(0,75,150,225 kg/hm2) and dressing ratios(basic N∶tiller N∶and panicle N as 10∶0∶0,7∶3∶0,7∶0∶3 and 4∶3∶3) on dry matter production,transformation and distribution of broadcasted rice among high standing-stubbles under no-tillage condition were studied.The results showed that with the increasing of amount of nitrogen applied,amount of dry matter accumulated at every growth stage increased,and weight of dry matter per day also improved.With the increasing of amount of nitrogen applied,the percentage of dry matter distributed to leaf increased,that distributed to stem and panicle declined.As far as the percentage of dry matter distributed to leaf was concerned,the two assigning proportions which applying N as 10∶0∶0 and 7∶3∶0 was separately higher than the other two proportions which applying N as 7∶0∶3 and 4∶3∶3,but as far as the percentage of dry matter distributed to panicle was concerned,the trend was opposite.