Different Row Spacing On The Growth,Development,Yield And Quality Of Filmless Cotton In South Xinjiang

Two varieties with different plant types were selected,and under the machine-picked cotton mode with a width of 2.28 m,three row spacing arrangements were set,A:76 cm+76 cm,1 frame and 3 rows;B:76 cm+10 cm+76 cm,1 frame and 4 rows;C:10 cm+66 cm+10 cm+66 cm+10 cm,1 frame with 6 rows;The effects of different row spacing configurations on the growth and development,canopy,photosynthesis,yield and quality of non-membrane cotton were discussed.Impact.By measuring and analyzing the agronomic traits,canopy structure indicators（LAI,MTA,DIFN）,photosynthetic indicators,accumulation and distribution of photosynthetic substances,yield and quality of non-film cotton under different row spacing configurations,explore reasonable non-film cotton The row spacing configuration provides theoretical basis and technical reference for optimizing the filmless cotton cultivation technology system in South Xinjiang.The specific conclusions are as follows:1.With the increase of row spacing,the single plant advantage of non-membrane cotton is enhanced,but the group advantage is weakened,but the plant height,stem thickness,fruit branch number,and boll number per plant are significantly higher than other treatments.Correlation analysis shows that plant height and stem thickness The number of fruit branches showed a significant positive correlation.2.The increase in row spacing has a greater impact on the upper leaf area index of non-film cotton.The leaf area index is middle>upper>lower.The upper leaf area index of B treatment is significantly higher than that of A and C treatments,and it has no significant effect on the middle and lower leaf area index.influences.The light distribution characteristics have a significant relationship with the cotton plant height.The larger the row spacing,the better the light conditions between the rows of non-film cotton.3.With the advancement of the growth period,the dry matter accumulation increased first and then decreased.The dry matter increased before 76 days,and the dry matter accumulation rate of treatment A increased the most,from 0.02 g·d^-1to 0.02 g·d^-1.At 1.95 g·d^-1and 2.23 g·d^-1,the dry matter accumulation rate of the flower and boll stage to the boll-spreading stage has an increasing trend,but the dry matter accumulation of the vegetative organs shows a downward trend,and the decline rate is the fastest at the flower and boll stage;on the contrary,the reproductive organs The accumulation of dry matter showed an upward trend,and the rate of increase was the fastest during the flowering and boll stage.4.As the line distance increases,there are differences in net photosynthesis and stomatal conductance among the treatments.The net photosynthetic rate and stomatal conductance of treatment A showed a"single peak"curve that first increased and then decreased throughout the day,,The contracting ability of light is obviously stronger than that of B processing and C processing.5.The number of bolls per plant and boll weight increased with the increase in row spacing.Among Xinluzhong No.82,the boll weight and boll number per plant were the largest in treatment A,and the number of bolls per plant and boll number per plant were both A,B is significantly higher than C.Among the two varieties,treatment C had the largest yield,which was significantly higher than treatment A and had no significant difference with treatment B.6.The horizontal distribution of cotton bolls shows that the inner bolls are larger than the outer bolls,and the vertical distribution shows that the middle bolls are the largest,the upper bolls are the second,and the lower bolls are the smallest.The fiber length,breaking specific strength and fiber uniformity of the two varieties show that the edge line is greater than the inside line,and the fiber length and breaking specific strength with the increase of the line distance are significantly better than the conventional mode（C）.With the increase of the traveling distance,the fiber length of the non-membrane cotton fiber increased,and the fiber length of C treatment was the longest.On the contrary,the breaking strength decreased.The uniformity of the two varieties is better.In the 619,the C treatment has the best uniformity,and the Xinluzhong No.82 B treatment has the best uniformity.For the elongation,the B treatment is better than the A treatment and the C treatment.