全量麦草还田和不同施氮量对水稻的影响

通过研究3种施氮量、2种稻作方式对2个常规粳稻产量及其群体发育特性的影响,结果表明:全量麦草还田处理的产量、成熟期LAI、成穗率、总颖花量、孕穗后群体茎蘖数随施氮量的增加呈先增后减的趋势,以武运粳7号施氮270kg/hm2的产量水平最高,与其他处理间差异均达极显著水平。麦草不还田处理的产量、LAI、成穗率、总颖花量、群体茎蘖数、高峰苗随施氮量的增加而增加,且以300kg/hm2处理的产量水平较高。采用240kg/hm2和270kg/hm2施氮水平时,全量麦草还田处理的产量、成穗率、总颖花量显著高于麦草不还田处理,但施用300kg/hm2处理则相反。因此,可以在生产上推广应用全量麦草还田方法。

Effects of wheat straw returning to field and nitrogen fertilizer application on rice

In the experiment,three nitrogen fertilizer levels and two cultural methods were applied to study its effects on the yield and development characteristics of two conventional japonica rice varieties.The results showed that when all the wheat straw was returned to field,the yield of rice,leaf area index in maturing stage,productive tiller rate,total amount of spikelet and tiller number of population after booting increased firstly and then decreased with the increase of nitrogen fertilizer level.The yield for the treatment 270kg/hm2nitrogen in Wuyunjing No.7 was the highest,and the difference of yield with other treatments reached highly significant level.While the wheat straw was not returned to field,the yield of rice,leaf area index in maturing stage,productive tiller rate,total amount of spikelet,tiller number of population and the peak tiller number increased with the increase of nitrogen fertilizer level,and the yield for the treatment 300kg/hm2nitrogen was higher than that for other treatments.Applying 240kg/hm2nitrogen and 270kg/hm2nitrogen,the yield of rice,productive tiller rate,and total amount of spikelet of all wheat straw returning were significantly higher than those in the treatments with no wheat straw returning,while the result of applying 300kg/hm2was contrary.Therefore,all wheat straw returning to filed could be extended in production.