强化栽培对水稻后期群体质量及产量形成的影响

以高产水稻品种两优培九和II优7954为材料,研究强化栽培对水稻中后期群体质量和产量形成的影响。结果表明,强化栽培在单位面积穗数不占优势下,主要是通过改善水稻后期群体质量,促进大穗形成从而实现增产。在强化栽培适宜种植密度下,抽穗期功能叶的配置比较合理,叶片宽且挺,能较好的截获光能,且水稻抽穗期至花后20 d的叶面积衰退率较少,有利于抽穗后光合能力的提高和物质积累,抽穗期茎鞘物质积累多,有利于提高穗粒数和结实率,保证水稻大穗形成。

Effects of SRI Technique on Population Quality after Heading Stage and Yield Formation in Rice

The relationship between population quality after heading stage and yield formation under SRI cultivation pattern was studied systematically using the high yield rice Liangyoupeijiu and Ilyou7954 as material. The results showed that SRI cultivation had no advantage over the conventional cultivation in the ears number per hm^2, however, SRI could improve population quality after heading stage and formed big spikelet. Adopting the proper plant density under SRI condition, there are good gesture from inverse 1^st leaf to 3^rd leaf at heading stage and leaf area decrease rate was low from heading stage to 20 days after flowering. SRI had obviously advantage over the conventional cultivation in photosynthesis and the accumulation matter with the higher weight of the stem and sheath,availing to increase grains per panicle and seed setting rate,and to form big spikelet.