灌溉方式和氮肥用量对水稻群体生长特性的影响

Impacts of Irrigation Mode and Nitrogen Amount on Population Growth Characteristics of Rice

以寒地粳稻东农425为试验材料,采用裂区设计,研究了灌溉方式和氮肥用量对寒地粳稻群体生长特性的影响。结果表明,灌溉方式和氮肥用量对东农425分蘖动态、各生育期叶面积指数、干物质积累及产量的影响程度均达显著水平。灌溉方式对各生育时期叶面积指数、干物质累积速率和产量的影响占主导作用。轻干湿交替灌溉方式下,适量增加氮肥用量可以显著提高抽穗期高效叶面积率、干物质累积速率和产量。轻干湿交替灌溉方式结合150~225kg/hm^2的氮肥用量为试验条件下最佳水、氮互作方式。

With Dongnong 425 as test material,the impacts of irrigation mode and nitrogen amount on population growth characteristics of japonica rice in cold zone were studied using the split plot design.The results showed that there were significant impacts of irrigation mode and nitrogen amount on tillering dynamics,leaf area index of different growth period,dry matter cumulative and production of Dongnong 425.Irrigation mode played a dominant role in the impacts of leaf area index of different growth period,cumulative rate of dry matter and production.Under the light dry-wet alternate irrigation,the high effective leaf area ratio,cumulative rate of dry matter and production significantly increased with the moderatey increase of nitrogen amount at heading period.Light dry-wet alternate irrigation with nitrogen amount of 150-225kg/hm-2 was the optimum combination.