Abstract:

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.