Effects of Plant and Row Spacing Configuration on Agronomic and Yield Traits of Film-Free Cotton in Southern Xinjiang

Guo Zixuan; Hu Qiang; Mao Tingyong; Wan Sumei; Lin Jiao; Zhang Bianxiong; Li Tiantian; Zhou Jun; Chen Guodong

doi:10.14083/j.issn.1001-4942.2023.12.006

Abstract：In order to screen out the reasonable plant and row spacing configuration suitable for machine-harvested cotton without plastic film in southern Xinjiang,this experiment was conducted with Zhong 619 as test material by setting different plant and row spacing configuration treatments under the machine-harvested mode with the piece width as 2.28 m.Three plant and row spacing configurations were designed,which were D1(one piece of three rows,equal row spacing of 76 cm,plant spacing at 7 cm),D2(one piece of four rows with row spacing as 70 cm+12 cm+70 cm,average row spacing at 57 cm,plant spacing at 10 cm)and D3(one piece of six rows with row spacing as 10 cm+66 cm+10 cm+66 cm+10 cm,average row spacing at 38 cm,plant spacing at 14.6 cm).Their effects on agronomic and yield traits of film-free cotton in southern Xin-jiang were studied.The results showed that the plant height,daily growth of stem and stem diameter of cotton increased with the increase of row spacing.The leaf area index of middle part under D1 treatment was 43.11%higher than that under D3 treatment.The light distribution of every treatment showed as a"V"type curve,and there were significant differences between different treatments.The illumination under D1 treatment was the largest,followed by D2 treatment,and that of D3 treatment was the smallest.From the horizontal and ver-tical distribution,the spatial distribution of cotton bolls under D2 treatment was the most reasonable,which had obvious effect on increasing population yield;the vertical distribution of cotton bolls showed as middle bolls＞upper bolls＞lower bolls,and the middle bolls played a greater role in the formation of population yield;the horizontal distribution of cotton bolls showed that the inner bolls were more than the outer bolls,and the yield mainly came from the inner bolls.The yield of D2 treatment(5 528.75 kg·hm-2)was significantly higher than that of D1 treatment(5 064.57 kg·hm-2)and D3 treatment(4 798.98 kg·hm-2).In summary,the plant type and canopy structure of cotton without plastic film in southern Xinjiang were better under D2 treatment,and the yield was the highest.