湘杂棉8号在不同密度条件下棉株的成铃分布

Distribution of Boll-setting of Xiang Za 8th Under Different Density

以湘杂棉8号品种，设6个不同密度处理3次重复，从纵向、横向和圆锥体顺序比较其成铃分布状况。结果表明：各处理成铃率下部高于中部、中部高于上部；内围铃高于外围铃；单株成铃率以12000株/hm^2成铃率最高为42．6％，57000株/hm^2成铃率最低为28．2％；圆锥体成铃率，第1圆锥体以12000株/hm^2和21000株/hm^2两处理的成铃率最高，达到90％，第2、3圆锥体成铃率以12000株／hm^2、21000株／hm^2成铃率高，均超过70％，第4．10圆锥体成铃率随着密度、圆锥体序数的增加而逐渐降低，12000株／hm^2在第5圆锥体的成铃率达到50％以上。

The experiment took Xiang za 8 as the same variety, 6 treatments were designed, repeated 3 times. It analysed and compared cotton boll - setting from length order, breadth order and crcular cone sequence. The results indicated that： the cotton boll setting ratio of lower section was higher than central section , central was higher than upper, exteral layer more than inner; the highest boll setting ratio is 42.6 percent under 12 thousands per hm^2 , 28.2 percent is the lowest under 57 thousands per hm^2. Cotton boll setting ratio under 12 thousands per hm^2 and 21 thousands per hm2 were the highest in the first crcular eone sequence, they were more than 70 percent in the second and third creular cone sequence. From 4 to 10 , the boll setting ratio was gradually reduced along with density and cone orders increasing, cotton boll setting ratio under 12 thousands per hna2 was more than 50% in the fifth cone.