Effects of Total Straw Returning and Nitrogen Fertilizer Application on Rice Growth in Dry Land to Paddy Field
The experiment was conducted to explore the effect of total straw returning and increasing nitrogen fertilizer application on rice growth in dryland to paddy fields,in order to find a reasonable amount of nitrogen fertilizer application to provide theoretical support for high-yield and high-quality cultivation techniques of rice in dryland to paddy fields.In the experiment,the mechanical crushing of the fore crop of rice straw was returned to the field and reduce the application of compound slow release fertilizer 600 kg/hm2(conventional dosage 750 kg/hm2)and increase the application of unequal amount of urea.Four urea application gradients were set up to 75,150,225,300 kg/hm2 respectively and no urea was used as a control.The fertilizer and straw were turned into the soil at the same time and there was no top dressing in the later stage.The randomized block design was used.With the increase of nitrogen fertilizer application,plant height and leaf area index were also increased,peroxidase activity in leaves increased first and then decreased and malondialdehyde content in leaves decreased first and then increased during rice growth period.Increasing nitrogen fertilizer could increase effective panicles per unit area,grains per panicle,ripe-ning percentage,rice grain protein and reduce chalkiness.The results showed that 225 kg/hm2 urea was the best,which was beneficial to the growth,yield and quality of rice.
国家科技期刊平台
NSTL
万方数据
维普
