Response Of Cotton Yield And Quality To Different Fruit Branch Types And Density In Jujube Cotton Intercropping

This study selected two cotton varieties,respectively representⅠtype interacted in the Xin Luzhong NO.41（P2）representativeⅡtype branch of Xin Luzhong NO.82（P1）;Five planting densities were set for each variety,which were 120,000 plants/hm²（M1）,150,000 plants/hm²（M2）,180,000 plants/hm²（M3）,210,000 plants/hm²（M4）and 240,000 plants/hm²（M5）,respectively.Using the same cultivation and management mode,the growth and development of cotton,dry matter accumulation,photosynthetic characteristics,yield varieties,etc.,were analyzed and compared to explore the suitable cotton planting mode under intercropping conditions,so as to explore the development of jujube cotton intercropping mode in the future.1,Jujube cotton interplanting mode,under different planting densities,cotton in low planting densities had obvious advantages in each growth character,and the advantages gradually decreased with the increase of planting densities.Among different varieties,P1 has advantages in plant height and stem diameter,but P2 has more advantages in fruit branch number,bud number and boll number compared with P1,indicating that P2 has stronger boll setting ability.2,Early stage of the cotton growth is given priority to with vegetative growth,late is given priority to with reproductive growth.The dry matter accumulation of cotton under different densities decreased with the increase of planting density.The dry matter accumulation of P2 was more than that of P1 between two varieties.Cotton dry matter RVR value is an important index of cotton production,the varieties of P1,RVR value is shown as:M3>M4>M2>M5>M1,P2 varieties are:M4>M5>M3>M2>M1,between varieties of P1>P2.3.By the spatial distribution of radiation proof,light radiation affected by planting density and length of branch,the density,the greater the Mian Hua Suo by light radiation is less,the cotton line part of them is the most obvious,in addition,line P2 cotton varieties by light radiation than P1 varieties of cotton lines,shows that compared withⅡtype branch,are more likely to receive more sunlightⅠtype strong resources.LAI index of cotton at flowering and boll stage was higher than that of cotton at batch-opening stage.LAI index of cotton under different density treatments was the highest in M5 and the lowest in M1.Performance for different spacing between LAI index:cotton lines narrow line width>jujube>cotton cotton,different canopy height is shown as:lower canopy>central canopy>upper canopy,different varieties are as follows:P1>P2.The LAI index of cotton has a direct influence on the temperature and humidity in the cotton field.The larger the LAI index of cotton is,the stronger the insulation and moisture preservation ability of cotton is,and the smaller the variation range of temperature and humidity throughout the day is,the worse the air flow between the plants.4.Cotton SPAD value showed a decreasing trend with the increase of planting density,and P2>P1;In terms of photosynthesis,the cotton plant photosynthetic rate（Pn）,stomatal conductance（Gs）,intercellular CO₂concentration（Ci）,transpiration rate（Tr）are presented with the increase of planting density and lower trend,showed the planting density is too large to cotton plant photosynthesis,photosynthesis on the quality of the cotton plant dry matter accumulation has a direct effect.Among different varieties,the photosynthesis of P2 is stronger than that of P1.5,Influence of different density between the cotton fiber on average half the length uniformity index,breaking strength,elongation,there were no significant differences that planting density has no effect on the above four,incompatible micronaire and there were significant differences,and presents the basic density is larger,the smaller the incompatible micronaire trends,including the M5 incompatible micronaire of grade A,better than the other four planting density,under the same level,the greater the density,the lower the level of cotton,with A category B four density cotton quality performance for:M1>M2>M3>M4.P2 was better than P1 in average length,breaking strength,elongation and micronaire value of the upper half,while P1 was better than P2 in breaking strength.The whole growth period of P2 cotton variety is 12 days longer than that of P1 cotton variety.The longer the growth period,the better the quality of cotton fiber and the higher the maturity.Therefore,the quality of P2 cotton variety is better than that of P1cotton variety by comprehensive comparison.6.Under the jujube/cotton intercropping mode,the cotton yield of P1 variety was M3>M4>M2>M5>M1,the cotton yield of P2 variety was M4>M5>M3>M2>M1,the overall yield of P1 was greater than P2 between the two varieties;the length of fruit branch,number of fruit branch,number of fruit node,number of boll per plant and weight per boll of cotton all showed a decreasing trend with the increase of planting density except garment percentage.It was found that the main factors affecting cotton yield were the number of fruit nodes,boll number per plant and boll weight per plant,and the fruit branch length was significantly positively correlated with these three factors.The longer the fruit branch,the more the number of fruit node,boll per plant,boll weight per plant,the higher the yield;the high yield cultivation patterns were P1M3 and P2M4,of which P1 wasⅡtype fruit branch cotton variety and P2 was strip type fruit branch cotton variety.M3 was 180,000 plants/hm²and M4 was 210,000 plants/hm².To sum up,this study based on jujube cotton interplanting modeⅠtype interacted withⅡtype frutescence.stage of cotton varieties and the indicators between five different planting density of comparison,analysis,Ⅰtype interacted in the boll,photosynthesis and dry matter accumulation and transmission of light in the field has an advantage,the cotton fiber quality and overall stronger thanⅡtype frutescence.stage of cotton varieties;ButⅠtype frutescence.stage of cotton bolls fall off at a rate of 36.7%,up from 25.6%Ⅱtype frutescence.stage of cotton,and interactedⅡtype thanⅠtype number of fruit branch1.45,suggesting thatⅡtype thanⅠfrutescence.stage of cotton type strong cotton,with stronger cotton boll compensatory,can effectively compensate for peeling off the bolls,andⅡfrutescence.stage of cotton in the boll number per,lint,single boll weight better thanⅠbranch,shows that compared withⅠfrutescence.stage of cotton,cotton in jujubeⅡtype branch under the condition of intercropping cotton varieties can yield more.As a result,Ⅰtype frutescence.stage of varieties of cotton fiber quality is better than that ofⅡfrutescence.stage of varieties,Ⅱtype frutescence.stage of varieties of cotton yield is higher thanⅠtype frutescence.stage of varieties,the collocation of high-yield cultivation density as follows:Ⅰfrutescence.stage of cotton collocation of 210,000 plants/hm²,Ⅱfrutescence.stage of cotton type collocation of 180,000 plants/hm².