Effect Of Row Spacing Pattern On Machine-harvested Cotton Yield Formation And Harvest Quality

The experiment was carried in Changji Prefecture, Xinjiang in 2014,the choice of suitable mechanical harvesting varieties Xinluzao 32 and Xinluzao 57 as tested material, set up two wide and narrow row spacing patterns(66+10cm, 72+4cm) for treatment, effect of row spacing pattern on machin-havested cotton growth,yield components,canopy structure,photosynthetic characteristics,fiber quality and machine-harvested quality,selection of suitable machine-harvested cotton row spacing pattern,providing a theoretical basis and data support, The main results are as follows:1、To identify the effect of row spacing pattern on the machine-harvested cotton growth and photosynthetic material production. 72 + 4 mode because much mulch cover, large area lighting, ground temperature is high,conducive to the growth of cotton seedling stage,showed the cotton growth, for budding early performance, flowering and boll opening late, relatively prolonged growth period; The mode of 66 + 10 to plant height, leaf as the foundation,form more dry matter, and improve air and light groups, increase the proportion of peripheral boll, which will help the growth of the cotton late,performance for bud late, flowering and boll opening early growth period is relatively short.2、To clear row spacing pattern on the machine-harvested cotton canopy structure and photosynthetic characteristics. Canopy structure is formed under the mode of 66+10 is compared to 72+4 mode, more conducive to the cotton growth anaphase ventilation and light transmission, make more leaves are light, thus contributing to the net photosynthetic rate of leaves of strong and long duration; makes 66 +10 pattern seed cotton was significantly higher than that of 72 + 4 mode 23.6% for 7544.08 kg ? hm-2, which between the two modes bolls per plant were significantly different.3、To clear row spacing pattern on the machine-harvested cotton yield, fiber quality and machine-harvested quality. 72+4 mode compared with 66+10 mode line width becomes wide, narrow line narrowing, in the later stage of cotton the field shading levels increase, air circulation is affected, and competition between individuals of cotton, so that the lint yield lower than 66 + 10 mode 32.01% and difference reached significant level; Effect of row spacing pattern on the indexes of lower and upper cotton significantly, the central impact was not significant; Manual picking or mechanical harvesting, at 66 + 10 mode cotton fibers compared with 72 + 4 pattern of good quality; Mechanical harvesting however, also showed the 66 + 10 mode, high picking the net rate, low impurity, the total loss rate is small.