不同密度对穴盘育苗移栽棉花生长发育及产量的影响

为研究穴盘育苗移栽棉花的关键栽培技术,在大田栽培条件下,以科棉6号为研究材料,分析不同密度条件下,穴盘育苗移栽棉花的生长发育特性。结果表明,在密度3万株/hm2条件下,穴盘育苗移栽棉花每公顷成铃最多,达90.3万个,产量最高,达4300.5kg/hm2。在营养生长方面,株高随密度的增加而增加,但3.6万株/hm2处理株高太高,需控制其株高生长。单株主茎叶数则表现为,在低密度条件下较多,高密度条件下较少,如8月15日,密度1.8万株/hm2处理主茎叶数26.2张,3.6万株/hm2处理仅为24.0张。但在3万株/hm2条件下,群体LAI较为适宜,叶角较高,叶片直立,如在8月15日,LAI为3.75,叶角62.3。在生殖生长方面,各密度处理间单株现蕾数无明显差异,单株成铃在低密度条件下成铃高。但密度3万株/hm2处理群体蕾量较高、成铃数最多。进一步分析各处理群体质量指标结果表明,密度3万株/hm2处理亩果节、成铃率、高效叶面积、铃叶比均最为适宜。

Effects of different plant density on Growth and Yield of Cotton Plug Seedling

Abstract: The research aimed to study the key transplanting technique on plug seedling of cotton. Ke mian No.6 was used to investigate effects of different plant density on the growth and yield of cotton plug seedling. The results showed that the treatment of 30000 plant per hectare had the most boll-setting number, 90.3 millions per hectare and the highest yield, which was 4300.5 kg per hectare. In the way of vegetative development, the bigger planting density, the higher plant height. But the plant height of 36000 plant per hectare was too high, so it should be controlled. The number of main-stem leaves was more under lower density (18000 plant per hectare), fewer under higher density (36000 plant per hectare). However, under the higher density, LAI was more feasible (3.75), leaf orientation was bigger (62.3). In the way of reproductive growth, the number of cotton buds on one plant among different density treatments had no significant difference. The number of bolls on one plant under lower density was more. However, the number of cotton buds and bolls per hectare was highest under the condition of 30000 plant per hectare. Though further analysis population quality index showed that the number of fruit-nodes, the rate of boll setting, effective leaf area index, boll / leaf were most feasible.