江苏沿海棉区棉花密度对群体结构的影响及其与产量和效益关系的研究

Effect of Planting Density on Group Structure of Cotton and Its Relations with Cotton Yield and Benefit in Coastal Area of Jiangsu

通过对不同密度条件下棉花个体和群体成铃结构、产量因子、冠层结构以及植棉成本和效益分析研究,表明在江苏沿海棉区种植中早熟杂交抗虫棉获得高产的种植密度的变幅较大,在密度1.65万~3.45万株/hm2范围内都可以获得4000 kg/hm2以上的产量,获得最佳产量的密度在2.7万株/hm2左右,但是综合考虑种子、农药、化肥、用工等成本,最佳效益的种植密度应该在2.5万株/hm2左右。

We analyzed and studied the boll structure, yield components, canopy structure, planting cost, and planting benefit of hybrid cotton individuals and group under the condition of different planting densities. The results indicated that： there was a broad planting density extent for obtaining high yield of mid-early-mature hybrid insect-resistant cotton in the coastal area of Jiangsu; the cotton yield could reach 4000 kg/hm2 under the planting densities of 16500-34500 plant/hm2 ; the planting density for obtaining the highest yield of cotton was about 27000 plant/hm2. Comprehensively considering the cost of seeds, pesticides, chemical fertilizers and labors, we thought the most economic planting density of hybrid cotton should be about 25000 plant/hm2.