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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。
The salinized paddy fields were selected to treat rice straw with 30%, 50% and 70% treatments. The effects of rice straw application on rice growth and yield were studied. The results showed that compared with the CK, 30%, 50% and 70% straw returning had no significant effect on rice growth and shoot dry matter accumulation at jointing stage, but had significant effect on grain filling maturity. 50% straw returning could increase the effective leaf number and effective leaf area of paddy at grain filling stage, and increase the dry matter weight of aboveground part. The yield of rice with 30% straw returning increased by 4.0% compared with the control, but the difference was not significant (P> 0.05) The yield of rice returning to field increased by 9.4% compared with the control, the difference was significant (P <0.05). The yield of straw returned to straw by 70% was 1.2% lower than the control, but the difference was not significant (P> 0.05). The results showed that in the salinized paddy field, the amount of straw returning could not be too much, and the optimal control was about 50%. The high yield was not conducive to the growth and development of rice and the yield was reduced.