盐渍化水田秸秆还田对水稻生长及产量的影响

选择盐渍化水田进行水稻秸秆30%、50%和70%还田处理,研究水稻秸秆还田对水稻生长及产量的影响。结果表明,与CK相比,30%、50%和70%秸秆还田对拔节期水稻生长及地上部干物质积累没有显著影响,对灌浆成熟期影响显著。50%秸秆还田可提高灌浆期水稻有效叶片数和有效叶片面积,增加地上部干物重;30%秸秆还田的水稻产量比对照提高4.0%,差异不显著(P>0.05);50%秸秆还田的水稻产量比对照提高9.4%,差异显著(P<0.05);70%秸秆还田水稻产量比对照降低1.2%,差异不显著(P>0.05)。说明在盐渍化水田秸秆还田时,秸秆还田量不能过多,控制在50%左右最佳,还田量过高不利于水稻生长发育,产量降低。

Effects of Rice Straw Application to Soda-Salinization Paddy Soil on Rice Growth and Grain Yield

The soda-salinization paddy soil was treated with 30%,50% and 70% of rice straw,the effects of rice straw application to soda-salinization paddy soil on rice growth and grain yield were studied.The results showed that,in the soda-salinization paddy soil with 30%,50% and 70% of rice straw application,the rice growth and the aerial part dry matter had no significant differences with the control at jointing stage;but there were significant differences with the control at grain filling stage.In the soda-salinization paddy soil with 50% rice straw application,efficient leaf numbers,efficient leaf area and aerial part dry matter of rice were significantly higher than those in the control at grain filling stage.In the soda-salinization paddy soil with 30% rice straw application,the grain yield was increased by 4.0% compared with the control(P>0.05).In the soda-salinization paddy soil with 50% straw application,the grain yield was increased by 9.4% compared with the control(P<0.05).In the soda-salinization paddy soil with 70% straw application,the grain yield was reduced by 1.2% compared with the control(P>0.05).These results showed that 50% rice straw application was optimum for grain yield;it was not beneficial to rice growth and grain yield when rice straw application was higher than 50%.