重穗型杂交稻抛秧栽培施氮技术探讨

Studies on application methods of N fertilizer in scattered-transplanting cultivation of large panicle hybrid rice

以田间试验研究了重穗型杂交稻抛秧栽培的施氮技术。试验结果表明 :在单位面积总施氮量相同的前提下 ,适当增大本田中后期的施氮比重可较有效地控制无效分蘖 ,提高抽穗后水稻植株的含氮量、剑叶的光合速率和维持生育后期的根系活力 ,缓解重穗型杂交稻的库、源矛盾 ,促进穗部物质积累和提高结实率 ,从而保证在适应有效穗数的基础上实现多粒大穗 ,较好地发挥重穗型杂交稻的高产潜力。

A trial was conducted in field condition in 1999 and five treatments were designed to determine the effect of application methods of N fertilizer on scattered transplanting cultivation of large panicle hybrid rice The results indicated as follows:in the same amount of N fertilizer for different treatments in the whole field stage,as the increase of applying fertilizer proportion in the middle and later stage of rice,the ineffective tillers of rice were reduced and the percentage of bearing spike tillers was raised,the content of N in rice plants,the photosynthetic rate of flag leaf and the amount of cut flowing juice of rice roots after heading stage were increased,and the dry matter accumulation of rice panicle was more sufficient and the grain yield was remarkably raised.