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在移栽棉田中设置重复试验,研究草害对棉株的危害及控制的经济阈值。草害参数与棉株生育、产量性状呈Y=Ax~B幂函数关系,与品质性状、害虫危害呈Y=A+Bx直线回归关系。因年度间棉花产量呈动态改变,据经济阈值的恒等变换模式,设计了各皮棉产量时除草的经济阈限指标,供棉田除草时参考应用。
Repeat experiments were set up in the transplanted cotton fields to study the damage and control economic thresholds of cotton weeds. The relationship between grass pest parameters and cotton growth and yield traits showed a power function Y = Ax ~ B and a linear regression relationship of Y = A + Bx with quality traits and insect pests. Due to the dynamic change of cotton production during the year, according to the constant economic threshold transformation mode, the economic threshold index of weeding in each lint yield was designed for reference when weeding cotton.