杂交水稻稀播条件下机插取秧量研究

目的]明确杂交中籼稻机插适宜取秧量,为完善杂交中籼稻机插平衡栽培技术、提高机插水稻产量提供技术支撑和理论依据。方法]以两系超级杂交中籼稻徽两优6号为材料,在"机插平衡栽培理念"的稀播条件下,通过调节取秧量来构建不同的群体基本苗起点(1、2、3、4、5苗/穴),研究不同取秧量对杂交中籼稻机插秧栽插质量和产量形成的影响。结果]群体基本苗起点在1~3苗/穴时,随着取秧量的加大,整体栽插质量逐渐提高,群体颖花量逐渐增加,产量也随之增加;但当取秧量超过每穴3苗时,群体起点过大,不利于高产群体的构建,反而易导致减产。结论]在安徽江淮一季稻区,杂交中籼稻机插以纵、横向取秧量为10.0 mm×10.8 mm或12.0 mm×14.0 mm的组合,即每穴2~3苗较为适宜。在此取秧量的条件下,有利于构建合理的群体结构,在稳定库容充实度的情况下形成较大的库容量,最终获得产量。

Study on the Fetch A Seedling Amounts of Mechanical Transplanted Hybrid Rice with Sparse Sowing

To make clear the suitable fetch a seedling amounts of mechanical transplanting hybrid rice to apply the technical support and theoretical foundation for improving the balance cultivation technology for the mechanical transplanted hybrid mid-indica rice. Method]Two-line super hybrid mid-indica rice Hui Liang-you 6 as materials to study the effects of different fetch a seedling amounts on the transplanting quality and the yield formation of hybrid mid-indica rice through adjusting the fetch a seedling amounts for building the different basic seedlings（1,2,3,4,5 seedlings /pot） with the spares sowing of balance cultivation. Result] The transplanting quality,the population spikelets and the yield increased with the increasing of the fetch a seedling amounts while the basic seedling was in the range of 1 to 3 seedlings /pot. It was not benefit for building the high-yield population and decreased the yield when the fetch a seedling amounts surpassed the 3seedlings /pot with the oversize population. Conclusion]The suitable fetch a seedling amounts with length ways and crosswise is the combination of 10. 0 mm × 10. 8 mm or 12. 0 mm × 14. 0 mm in the single-season rice area of Jiang Huai region of Anhui province. It is benefit for building the reasonable population and increasing the yield for the the big storage capacity of stable capacity of enrichment degree with 2 ~ 3seedlings /pot.