【摘要】 在扛苏省东台市里下河、通榆线、沿海三个棉种繁殖区,分层随机抽取120块田,调查密度、肥料和化学控制对棉种产量的影响。采用聚类和回归分析的方法寻求密、肥、控的最适运筹点。研究结果对大面积棉种高产、稳产繁殖具有一定参考价值。更多还原

【Abstract】 In commercial multiplication of cotton cultivars,it should be noticed that increases in planting density and the application of fertilizers and chemicals may lead to increases in production cost,management risks and unstableness of seed yield and quality. The purpose of the present study was to find out a better combination of these three agronomic factors. Data of 120 multiplicating plots randomly drawn from 3 ecotype regions in Dongtai City were used to carry out curvilinear regression and clustering analysis. The optimal operational points of the three factors for each of the three ecotype regions were obtained ,tested and appraised.更多还原