摘要
棉花麦后直播种植方式具有提高土地利用率和劳动生产率的优势,但由于播种迟,生育期短,丰产难度较大。该研究以设置不同密度作为调节棉田群体结构的手段,通过灰色关联和回归分析,揭示棉花在麦后直播条件下生物学产量、叶面积指数变化与皮棉产量的关系,为其丰产栽培提供依据。研究结果表明,提高棉田生物学产量是麦后直播棉丰产的潜力所在;调节叶面积指数变化动态,使其苗、蕾期增长快,8月中旬达到高峰(叶指3—3.5),实现棉花库、源旺盛期与当地最佳光热资源期三者间协调同步,这是麦后直播棉丰产之关键。
Directly sowing cotton in the field soon after the harvest of barley (around May 25, about 50 days later than conventional sowing), as a cropping pattern, has the advantage of higher land use percentage and labour productivity compared to the prevailing cropping patterns , but owing to the limited growth period, the cotton yield is usually dropped to a certain extent. In this study, in order to reveal the special rule how the development dynamics of cotton biomass and leaf area index affects the lint yield under the condition of post-barley direct sowing. Cotton was planted on May 30, 1989 and May 21, 1990 in different densities to establish different population structures. Grey relational analysis and regression analysis show that the potential of higher lint yield of post-barley directly sown cotton (PBDSC)lies in increased biomass. The key to higher lint yield of PBDSC is to regulate the development of the population leaf area, which, in the form of a second power curve, is expected to grow fast at the stages of young seedlings and squaring,and reach the peak (leaf area index 3-3-5) in middle August, resulting in the agreement of the vigorous growth peroid of the source and sink of cotton with the optimal period of the local resources of light and heat.
出处
《江苏农业学报》
CSCD
1993年第4期16-21,共6页
Jiangsu Journal of Agricultural Sciences
基金
江苏省农业基金资助项目
关键词
棉花
麦后直播
皮棉产量
叶面积
cotton
summer sowing
lint yield
biomass
leaf area index
