两系杂交水稻两优681高产栽培模式研究

采用二次回归正交旋转组合设计,考察施N量、追N时期、施K量、密度和播期5个因素,对两系杂交水稻两优681进行了高产栽培模式的研究,建立了该类型品种的农艺措施数学模型。对回归方程进行了统计选优,降维分析,边际效应分析。结果表明,各因素的重要性依次为播期>施K量>密度>追N时期>施N量。高产栽培模式要点为施N量(纯N)9·3~10·0kg/667m2,追N时期为7月9~11日(雌雄蕊分化至减数分裂期),施K量(K2O)15·7~16·8kg/667m2,栽插密度为1·72~1·80万窝/667m2,播种期为3月26~28日。

Study on Cultivation Pattern of Combination of Two-line Hybrid Rice-Liangyou 681

For Liangyou 681 which is a combination of Two-line hybrid rice, the cultivation pattern of high yield are analyzed with the device of secondary regression orthogonal rotary combination. In this study, there are five factors investigated. They are amount of N nutrition, period of dressing N, amount of K nutrition, Planting density and sowing date. For the regression equation, statistical optimum choosing, and the analysis of dimension reduced and margin effect have been analyzed. The results reveal that five factors are in this following order of importance: sowing date, amount of K nutrition, planting density, period of dressing N, amount of N nutrition, and that the main points for the pattern of cultivation are: application dose of pure nitrogen is 9.3～10.0?kg/667?m2, period of dressing N is 9～11th, July, application dose of potassium is 15.7～16.8?kg/667?m2, planting density is 17200～18000 hills/667?m2 and sowing date is 26～28th, March.