氮肥水平及运筹对太湖糯2号产量形成的影响

Effect of N-fertilizer Level and Application Mode on Yield Formation of Taihunuo No.2

研究了不同施氮量及其运筹对太湖糯2号产量及经济性状的影响。结果表明:(1)在施纯氮300 kg/hm2、前后期施氮比例为6∶4条件下,产量达最高水平,为9299.45 kg/hm2。(2)不同施氮处理产量的差异首先是由单位面积穗数引起的,其次为结实率和每穗粒数,千粒重对产量的影响较小。(3)产量与抽穗后干物质生产量关系密切,而与抽穗前干物质生产量和生物产量的关系不明显。(4)增施氮肥能有效促进分蘖成穗,但前期施用氮肥过多,反而会使无效分蘖增多,降低成穗率。

The effects of different nitrogen fertilizer levels and application modes on the yield and economic characters of Taihunuo No. 2 were studied. The results showed that the yield reached the highest level when 300 kg/hm^2 pure nitrogen was applied and the ratio of nitrogen applied at earlier stage to nitrogen applied at later stage was 6： 4. The yield difference among different nitrogen applica- tion treatments was firstly caused by the spikes per unit area, then did by setting rate and grains per spike. There was significantly positive correlation between yield and dry matter production after heading, but no obvious correlation between yield and dry matter production before heading as well as biological yield. Properly increasing the application rate of nitrogen fertilizer could effectively promote tillering and the formation of spikes, but much application of nitrogen fertilizer at earlier stage could increase ineffective tillers and re- duce the rate of panicles.