不同施氮量对桃优香占产量及农艺性状的影响

Effects of different nitrogen amounts on yield and agronomic characters of Taoyouxiangzhan

以水稻桃优香占为材料,设置了5个氮肥用量以不施N肥为对照N0;135 kg/hm^(2),N1;150 kg/hm^(2)(N2)、165 kg/hm^(2)(N3)、180 kg/hm^(2)(N4),研究在虾稻共作模式下,不同施氮量对桃优香占产量及农艺性状的影响。结果表明,桃优香占在虾稻共作模式下,增施氮肥其最大分蘖数增加30%,叶片SPAD值增加9.38%,齐穗期和乳熟期地上穗部干物质分别增加37.9%和41.1%,有效穗、结实率和千粒重在氮肥条件下分别增加39.1%、16.3%和3.69%,实际产量在N1、N2、N3和N4条件下相较对照分别增加57.8%、54.1%、69.2%和61.6%。其中,在N3施肥水平条件下增产效果最佳,但过量施用氮肥会降低氮肥利用率、造成农业面源污染,因此合理施用氮肥对于提高水稻产量、保护环境具有重要意义。

To investigate the effects of different nitrogen application rates on yield and agronomic characteristics of cultivar-Taoyoux⁃iangzhan under the rice-crayfish co-culture,5 nitrogen application rates 0 kg/hm^(2)(N0),135 kg/hm^(2)(N1),150 kg/hm^(2)(N2),165 kg/hm^(2)(N3),180 kg/hm^(2)(N4)were conducted in this study.The results showed that the maximum tiller number increased by 30%,the SPAD value of leaves increased by 9.38%,and the above-ground dry matter of the spikes at heading stage and milking stage in⁃creased respectively by 37.9%and 41.1%.The effective spikes,seed setting rate and thousand-grain weight were respectively in⁃creased by 39.1%,16.3%and 3.69%.The actual yields under the conditions of N1,N2,N3 and N4 were respectively increased by 57.8%,54.1%,69.2%and 61.6%compared to the control.The effect of increasing yield is best under the condition of N3,but exces⁃sive nitrogen fertilizer application reduces nitrogen fertilizer utilization rate and causes agricultural non-point source pollution.There⁃fore,rational application of nitrogen fertilizer is of great significance for improving rice yield and protecting the environment.