水稻秸秆还田量对后茬水稻生产的影响

Effect of the amount of rice straw returned on the production of the after-reap rice

通过一年两地田间小区试验，研究水稻秸秆还田对下茬水稻产量及构成因素的影响．结果表明：在常规施肥水平下，水稻秸秆低留茬还田量不超过200kg／666．7m2，能提高水稻产量；水稻秸秆高留茬还田量以300--450kg／666．7m2为宜，超过450kg／666．7m2会影响下茬水稻苗期生长，容易造成水稻减产。

Through a year of two field plot experiment, we studied the effect of the rice returned straw on the production and it＇s component factors after-reap rice . The results showed that the capacity of rice straw does not exceed 200 kg/666.7 m2 at low stubble returning, retumed straw could increase the yield of rice under the conventional fertilization level. Meanwhile, the best capacity of rice straw was 300-450 kg/666.7 m2 at high stubble returning, It would influence the growth of seedlings after-reap rice and easy to cause the reduction of rice output when exceed 450 kg/666.7 m2.