硫酸钾钙镁肥对水稻茎蘖发生和产量形成的影响

以当地主栽品种南粳9108为供试水稻品种,设置常规肥料和硫酸钾钙镁肥2个肥料处理,研究硫酸钾钙镁肥对水稻分蘖发生、产量形成等方面的影响。结果表明,硫酸钾钙镁肥处理的产量较常规处理的高,增幅达8.29%。从产量构成因素来看,2个处理的穗数、每穗总粒数和千粒质量差异较小。硫酸钾钙镁肥主要是通过增加结实率来提高产量,结实率增幅达9.32%,其他产量构成因素差异不大;硫酸钾钙镁肥处理较常规处理对分蘖发生无促进作用,其高峰苗低于常规处理,但高峰苗后分蘖退化慢,至有效分蘖终止期,其有效分蘖数略高于常规处理,增幅为2.55%,成穗率显著增加,增幅为9.83%。

Effects of Polysulphate on the Tillering and Yield Formation of Rice

In a fieldtrial,Nanjing 9108,the main rice variety planted locally,was used as the test variety.Two fertilizer treatments(the control treatment consisting of conventional fertilizers;the polysulphate treatment comprising conventional fertilizers and polysulphate)were used to study the effects of polysulphate on the tillering and yield formation of rice.The results showed that the rice yield of the polysulphate treatment was higher than that of conventional treatment,with an increase by 8.28%.In terms of the effect of the polysulphate treatment on yield components,on the one hand,the differences between the two treatments were small in the number of ears per 667 m^2,the number of grains per ear,and 1000-grain-weight;on the other hand,the rise in the yield of the polysulphate treatment was mainly due to the increase in seed setting rate,which reached 9.32%.Compared with the conventional treatment,the polysulphate treatment had no effect of promoting tillering,and its peak tiller number was 18.60%lower than that of the conventional treatment.However,in the polysulphate treatment the number of tillers per 667 m^2 declined more slowly after its peak,and the effective tiller number at the end of the effective tillering period was 2.55%higher,and the percentage of ear-bearing tillers increased significantly by 9.83%,as compared with the counterparts of the conventional treatment.