【摘要】 根据农业系统工程原理和方法,对影响棉花产量和品质的播种期、施纯氮量、密度、喷缩节安和去早蕾等主要栽培措施,于1987、1988年进行了优化组合研究,即采用旋转回归设计,借助电子计算机,建立以棉花高产,优质、高经济效益等为目标函数的数学模型。通过模拟寻优,选出高产、优质、高效益的综合栽培措施决策方案。经反馈试验表明、增产效果和经济效益显著。更多还原

【Abstract】 Based on principles and methods of agro-system engineering,optimal combinations on cotton yield and quality which are influenced by seeding date,side-dressing net N, planting density,spraying.DPC and removal of early season squares were studied by orthogonal rotational regression combination design with electronical computer to set up the mathematical models with objective functions aimed at high yield,good quality and higher economic profits in order to obtain the integrated cultivation design scheme through simulation on optimal combination selections.Experiments in 1987～1988 showed that the selected schemes objectived at seed cotton 250kg,lint cotton 100～110kg, prefrost seed cotton 230 and 150kg,net profit $300/mu are as follows,under the plastic mulching conditions,seeding dates in drought year is April 9 to 18th,with net N 7.5 to 9 kg/mu,3200～3500 plants/mu,DPC 1.2～2g/mu,removal of 7～8 early season squares/ plant;seeding dates in water~logging year is April 10th to 12th,with net N 9～12 kg/ mu,2200～2700 plants/mu,spraying DPC 3～3.6g,removal of 7 squares/plant.It showed that the effect of yield increase and aconomic profit were significant by feedback experiment.A proper adjustment of the schemes is needed according to the weather of the same year in production.更多还原