【摘要】 本文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、密度和播期五个因素,对两系杂交水稻两优681进行了以提高结实率为目标的栽培模式的研究,建立了该类品种的农艺措施数学模型。同时,采用了统计选优方法、降维分析法、边际效应分析法和贡献率法对回归方程进行了优化分析。结果表明:各因素对结实率影响的重要性依次为:播种期>追N时期>密度>施K量>施N量;结实率达到85%以上的配套栽培模式要点为:施N量(纯N)130.7~137.6 kg/hm2,追N时期为7月8日至9日(减数分裂期),施K量(K2O)218.9~222.1 kg/hm2,栽插密度为23.4~24.2万穴/hm2,播种期为3月30日至4月1日。更多还原

【Abstract】 A field study on increasing two-line hybrid Liangyou-681’s grain bearing rate was carried out using secondary regression orthogonal rotary combination and observing five factors:the amount of N and K,the dressing period of N,density and sowing time was used to create a mathematical model of agronomic traits.The results were as follows:（ⅰ）The order of importance of each factor on bearing rate was:sowing time,the dressing period of N,planting density,the amount of K,and the amount of N;（ⅱ）The optimal conditions for increasing grain bearing rate were as follows:purified nitrogen was 130.7-137.6 kg/hm²;dressing time of N was July 8-9（meiosis）;K₂O was 218.9-222.1 kg/hm²;the planting density was 234 000-242 000 plants/hm² and the range of sowing date was from March 30 to April 1.更多还原