【摘要】 在机采模式下,考察化学封顶剂对油后直播早熟棉花品种的应用效果及其对棉花生长发育的影响,并研究其应用技术和参数,为该技术在长江流域鄱阳湖植棉区的熟化、示范和推广提供依据。2017—2018年分别以中棉所50和中棉所425为试材进行机采模式下油后直播,设8个处理(喷施时间为2个,以T1和T2表示;喷施剂量设3个,分别以D1、D2、D3表示,以不打顶和人工打顶为对照,分别以CK1、CK2表示),研究其对棉花农艺性状、产量性状和品质的影响。结果表明,喷施化学封顶剂后,棉株在纵向和横向上的生长同时受到抑制,形成紧凑株型。与人工打顶相比,利用化学药剂封顶,只要掌握好喷施时间和使用剂量就不会造成棉花减产,对棉纤维品质也无明显影响。从2年的结果来看,在鄱阳湖植棉区的气候和生产条件下,利用化学药剂对早熟油后直播棉进行封顶,封顶剂的浓度以1 125～1 500 mL/hm~2,施用时间以人工打顶推迟5 d左右为宜。更多还原

【Abstract】 The effects of chemical capping agent on the growth and development of early-maturing cotton after rape direct seeding was studied under the machine-picking mode,the results provided a basis for the maturation,demonstration and promotion of this technique in the cotton planting area of Poyang lake in the Yangtze river basin. In 2017—2018,the Zhongmiansuo 50 and Zhongmiansuo 425 were used as test materials to perform live broadcast after rape harvesting in machine mode,with 8 treatments(spraying time were T1 and T2;spraying doses were D1,D2 and D3,respectively,and no topping and artificial topping as controls,respectively,CK1 and CK2)to study its agronomic characteristics and yield of cotton effects on properties and quality.After spraying the chemical capping agent,the growth of cotton plants in the vertical and horizontal directions was suppressed at the same time,forming a compact plant type. Compared with artificial topping,using chemical agents to cap,as long as you master the spray application time and dosage will not reduce cotton yield and have no obvious impact on cotton fiber quality.According to the results of 2 years,under the climate and production conditions in the cotton planting area of Poyang lake,chemical agents were used to cap the top of direct seeding cotton after early maturingrape,and the concentration of the capping agent was 1 125～1 500 mL/hm~2,the application time should be about 5 days later than artificial topping.更多还原