夏棉栽培措施优化决策研究

A Simulated Study on Shorter Growing Period Cotton＇s HighQuait Cultivation Optimum Measures

试验选用播期（x1）、密度（x2）、追纯氮（x3）、打顶留果枝数（x4）、去蕾果枝数（x5）五因素五水平二次正交旋转回归设计,对夏棉农艺组合措施、群体动态、成铃分布及产量结构进行研究,同时研究了夏棉高产优质的群体生育动态,找出了看苗促控的管理指标及成铃分布状况和产量构成因素相互影响彼此消长的互变关系,进而模拟出不同产量水平的产量结构,达到皮棉产量900 kg/hm2,霜前籽棉产量3 000 kg/hm2以上的综合农艺措施决策方案为5月20~23日播种,密度109 500~112 500株/hm2,追纯氮165.6~180.0 kg/hm2,打顶留果枝数8.4~8.7个,去下部1个果枝的早蕾。

According to the data obtained through quadratic rotated combination design on the basis of ＂five factors＂-sowing date（x1）、density（x2）、nitrogen fertilizer（x3）、keeps the bearing-branch number（x4）、bearing-branch number of combs out bud（x5） et al,and ＂five levels＂.Then,we have study on the crops high yield and high quality colony developments,and we discovered：the management index of cottons＇ growing,and change relations between the output factors from the sistuation of mature bolls＇distribution and the influences.Then,different output levels of output composition has been simulated.The optimum cultivation measurements of shorter growing period cotton for high output high economic benefit were：Its sowing in may 20～23,Its density is 109 500～112 500zhu/hm2,applys N 165.6～180.0 kg/hm2,keeps the bearing-branch to count 8.4～8.7,combs the flower bud of lower part bearing-branch.