棉花化学打顶剂的配制与筛选

化学打顶对于抑制棉花顶端的无限生长和实现轻简化栽培具有重要意义,而合适的打顶剂则是简化栽培管理的关键。采用自主配制的3种化学打顶剂（Z1、Z3和Z4）和市场上购买的氟节胺（Z2）、增效缩节胺（Z5）和缩节胺粉剂（Z6）3种化学药剂于花铃期（7月26日）进行喷雾（对照为不打顶）,于吐絮期对棉花株高、果枝始节高、植株上部（第9果枝）、中部（第5果枝）和下部（第2果枝）3个部位果枝长度、产量性状及纤维品质进行考察和统计分析。结果表明,不同化学打顶剂均对棉花的株高和果枝始节高有抑制作用,并且降低了上部果枝长度,增加了棉株的有效结铃数,增加了纤维产量,部分打顶剂对棉花纤维品质有轻微的影响,其中Z4处理在株型、产量和品质方面效果最佳。

Developing and Screening of Chemical Regulator for Cotton Topping

Topping by chemical regulator can inhibit the apical dominance and endless growth,and facilitate the efficient and simplified cultivation(ESC)management practices in cotton production.The appropriate chemical reagent and solution for cotton topping is the key to ESC management.In this study,three kinds of solution(Z1,Z3,and Z4)were made,along with three commercial regulators,flumetralin(Z2),DPC+(Z5),and N-dimethyl piperidinium chloride(DPC,Z6),purchased in the agri-supplies-market,were sprayed at flowering-bolling stage(July 26th)(control:no topping).At the boll-open stage,plant height,height of first branch,the fruit branch length of upper part of plant(9th sympodial branch),middle part(5th sympodial branch)and lower part(2nd sympodial branch),yield traits,and fiber quality were investigated and statistically analyzed.The results showed that all the different chemical topping reagents could inhibit the plant height and the height of the first fruit branch,and reduced the length of the upper fruit branch.Different chemical topping reagents increased the effective number of bolls of the cotton plant and the fiber yield,but they did not decrease the quality of cotton fiber.The chemical topping reagent Z4 had the best effect on plant type,yield and quality.