蕾铃期繁殖器官的损失对棉花产量的影响——人工模拟为害试验

1994、1995连续两年在华北棉区第3代棉铃虫发生期间，通过一系列人工摘蕾模拟为害和人工接虫为害试验，研究了棉花对蕾铃期繁殖器官损失的补偿效应。试验结果表明：蕾、铃被害会诱导棉株产生补偿效应，即提高结铃数，增加生物产量。但棉花的补偿效应是有限的，蕾铃期单株被害蕾超过12个，被害铃超过4个，或被害超过2蕾2铃，都会导致皮棉显著减产。通过数学模型分析，1994年，单株被害0-11．80个蕾或0—2．26个铃都不会造成减产；1995年．单株损失0—10．58个蕾或0—3．8个铃，同样不会降低棉花产量。模型中各决策变量的边际产量表明，棉花蕾铃期铃的损失对皮棉产量的影响最大。

Effects of the loss of squares and bolls on the production of cotton (Gossypiu m hirsutum L.) during the fruiting: manual simulation of damage

Cotton, Gossypium hirsutum L. is an indeterminate perennial plant. Th e reproductive organs (squares, flowers and bolls) are successively produced as plants develop; meanwhile, many of the reproductive organs abort and fall off be fore the boll opens. However, those abortions do not result in yield loss but st imulate the plant produces compensation, even over-compensation to enhance lint yield. Therefore, the compensation ability of cotton could be considered as an i mportant part of the integrated pest...