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[Objective] This study aimed to screen out good cotton varieties suitable for mechanical harvesting in Hami area. [Method]Nine cotton varieties were used as experimen s for two years, and the agronomic traits, dry matter dynamics, leaf area index, quality, yield and yield components of different cotton varieties were discussed and analyzed. [Result] The plant height of each variety was between 73.7 and 94.5 cm, the first fruit node was between 5.14 and 6.80 cm, the highest height at the beginning of the festival was Xinluzhong 55, and the second was Hanfeng 668. The largest number of fruit branches of the Hangfeng 668 was 9.67-10.21. The maximum dry matter quality per plant ranged from 118.5 to 167.7 g, and the growth rate was the fastest of Hanfeng 668, followed by Xinluzhong 55.Leaf area index showed a quadratic parabolic dynamic change, reaching its peak at boll stage, reaching 4.04-4.89. The micronaire value reached grade A of Hanfeng 668 and Xinluzhong 55, which were 4.03 and 4.20 respectively, and the fiber length of each treatment was 26.73-30.57 mm. The highest yield of seed cotton was 538.7 and 548.0 kg/667 m2 in Hanfeng 668, followed by Xinluzhong 55, which was significantly higher than that of other treatments. [Conclusion] Considering all factors, Hanfeng 668 and Xinluzhong50 were the best performance, there were suitable for planting under the machine mining mode in Hami cotton area. [ABSTRACT FROM AUTHOR]

[Objective] The composition and intensity of soil phosphorus forms played an important role in improving the phosphorus bio-avail-ahilitv of crop and the utilization efficiency of phosphorus fertilizer. This paper aimed to investigate the possibility and potential of application rate of P fertilizer, which provide a technical support for cotton production system. [ Method]The experiments applied 4 rates of P fertilizer [0 kg/hm2 ( P0) , 75 kg/hm2 ( P75 ) , 150 kg/hm2 ( PI50) , 400 kg/hm2 ( P400) ] were conducted to investigate the content of soil inorganic P in different soil layers during the critical periods of cotton phosphorus nutrition of three cotton cultivars ( XLZ57 , XLZ50, XLZ13). [ Result ] Compared with the control treatment(P0) , the Ca2-P, Ca8-P, Ca10-P, Fe-P, Al-P in seedling stage root layer (0 -20 cm soil layer) under the low P level ( P75) averagely increased by 68.5 % , 42. 0 % , -17.6%, 38. 8 % , 60. 5 % , and in blooming-boiling stage root layer (0 - 20 cm soil layer) averagely increased by 52.8%, 18.8%, -17.7%, 38.3%, 44. 7 % , respectively; Under the proper P level (P150) , in seedling stage averagely increased by 148. 9 % , 88. 1 % , -31.5%, 65. 5 % , 46. 7 % , in blooming-boiling stage averagely increased by 113.7 % , 54.5 % , 29.4 % , 77.6 % , 27. 7 % , respectively; Under the surplus P level (P400), in seedling stage averagely increased by 58. 6 % , 53.4 % , 44.4 % , 105. 8 % , 32. 8 % , in blooming-boiling stage averagely increased by 52. 3 % , 19.3 % , 40. 8 % , 143.8 %, 13.7 %, respectively. Under the different phosphorus conditions, the soil Ca8-P, Ca10-P, Fe-P contents of XLZ50 were higher than that of XLZ57 and XLZ13, the soil Ca2-P and Al-P contents of XLZ57 were higher than that of XLZ50 and XLZ13 in seedling stage, and the soil Ca8-P, Ca10-P contents of XLZ50 were higher than that of other two cotton varieties, the Ca2-P, Fe-P and Al-P contents of XLZ57 were higher than that of other two cotton varieties in blooming-boiling stage. [ Conclusion] Different phosphorus application levels and different genotypes of cotton have different effects on soil inorganic phosphorus accumulation, soil Ca2-P content in the 150 kg P2O5/hm2 treatment was highest, and the soil Ca2-P content of XLZ57 was higher than that of XLZ50 and XLZ13 during the critical periods in the 75-150 kg P2O5/hm2 treatment. Therefore, rational application of phosphorus fertilized (150 kg P2O5/hm2 ) and selecting of cotton varieties( XLZ57) can improve the available phosphorus source in soil, and improve the phosphorus fertilizer use efficiency. [ABSTRACT FROM AUTHOR]

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Copyright of Cotton Textile Technology is the property of Cotton Textile Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To prove the effects of the protein content of cotton on development of A. lucorum nymph, 3 organs (leaf, square and flower) of different cotton varieties (Sumian9, Zhongmian29 and Lumian15) were adopted to feed Nymph of Apolygus lucorum respectively. Growth parameters of nymph and the protein content of 3 organs of different cotton varieties were measured. Two factors analysis of variance (Organ X Variety) to protein content, duration and survival rate of nymph were analyzed. Furthermore, the relationship between protein content of cot ton and nymph duration, survival rate were analyzed. The results showed that there was a highly significant difference in the protein content of different varieties, and the protein content of leaf or square was more than 14. 9 percent higher than that of flower in same cotton variety. There was a close correlation between feeding organs and survival rate, developmental duration of A. lucorum nymph on different cotton varieties. The correlation index was 0. 9976, 0. 9586, 0. 9377 between the protein content on the same organ of different cotton varieties and the developmental duration of nymph, respectively. The trends of survival rate feeding on the same organ of different cotton varieties were consistent. There was a good correlation between protein content of cotton and developmental duration, survival rate of nymph. [ABSTRACT FROM AUTHOR]

In this paper, taken the cross between Xinluzao-42 and upland cotton genetic standard system as tested materials, 9 agronomic traits from the population were studied by genetic correlation analysis, path analysis and regression analysis. The results showed that the variation coefficient of the first-branch height was the highest and the lowest for the growth period. The correlation between fiber quality traits and most of yield traits was negative. The correlation coefficients and direct path coefficients were positive between lint yield and related yield traits, such as plant height, single boll weight and lint percentage, and was negative between lint yield and growth period. In addition, the improvement lint at the growth period had a greater role in promoting. The research results would guide early maturing trait selection of hybrid offspring and provide the theory basis for breeding high yield and good quality cotton variety. [ABSTRACT FROM AUTHOR]