棉花打顶和保留营养枝的效应研究

为适应生产上对棉花简化栽培技术的需求，以‘华杂棉H318’为材料，设置打顶整枝（A）、打顶留叶枝（B）、不打顶留叶枝（C）、不打顶整枝（D）4个处理，在大田条件下，对打顶、整枝对棉花产量和品质的影响进行研究。结果表明，打顶使棉花的平均成熟期延迟5~6天。打顶、留叶枝有利于棉花茎枝、叶片和生殖器官干物质的积累。留叶枝单株铃数增加，单铃重和衣分降低，籽棉产量和皮棉产量与整枝处理相当，打顶、留叶枝对棉花纤维品质的影响不大，最后得出打顶留叶枝处理最好。

Effect of Topping and Retention of Vegetation Branches on Cotton

To study the simplified cotton production technology, a field experiment was carried out to investigate the effect of topping and pruning on cotton. With transgenic insect-resistance hybrid cultivars ‘Huazamian H318’as materials, 4 treatments （A, B, C, D） were set up. A, B, C, D was topping and pruning, topping and non-pruning, non-topping and non-pruning, non-topping and pruning, respectively. The results indicated that： topping could delay the mean maturity days by 5-6 days. Topping and retention of vegetation branches was beneficial to the dry matter accumulation of stem, leaf and reproductive organs. More bolls per plant, lower boll weight and lint percentage appeared to result from the retention of monopodium. When plant density was the same, non-pruning could produced the same yield as pruning. Topping and pruning had little impact on the fiber quality, so topping and non-pruning was the best.