Crops ›› 2018, Vol. 34 ›› Issue (3): 103-107.doi: 10.16035/j.issn.1001-7283.2018.03.016

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Studies on the Effect of Mixed Defoliant on Cotton in Kuitun District, Xinjiang

Zhang Wen,Lu Tao,Ye Yuxia,Liu Quanyi,Feng Yang   

  1. Agricultural Production Division 7, Xinjiang Production and Construction Corps, Kuitun 833200, Xinjiang, China
  • Received:2017-11-03 Revised:2018-03-23 Online:2018-06-20 Published:2018-06-20

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Abstract:

In order to screen the best defoliants for cotton in Kuitun reclamation area, field experiment was conducted to study the effect of different deodorizing agents on cotton leaf removal efficiency, yield and quality. The results showed that up to 20 days after spraying, all leave removal rate reached more than 70%, and the removal rates of Ruituolong and Tuotulong treatment had little difference, but T1 and T2 treatments were significantly higher than the single application of ethephon treatment. The boll opening rate of each treatment was more than 90%, and the difference between defoliant treatments was not significant, which indicated that all the defoliants had good ripening effect. There was no significant difference between the treatment and control in cotton yield, single bell weight, clothing and sub-index, length, uniformity index, break strength, micronaire, maturity ratio, short fibre index, indicating that sprying defoliation ripening agent had little effect on cotton yield and quality. On the basis of the number of spraying, the defoliation and boll opening effect of the twice spray was better than that of the once spraying, but the quality of cotton was slightly lower than that of the once spray. The results indicated that Ruituolong had the best accelerating effect in Kuitun reclamation area for its high efficiency and low cost.

Key words: Defoliant, Cotton, Defoliant, Boll opening, Quality

Table 1

Test treatment"

处理Treatment 脱叶剂组合Defoliant combination 喷施时间(月-日) Spraying time (Month-Day) 用量Dosage (g/hm2)
T1 瑞脱龙+助剂+乙烯利Ruituo dragon+assistant+ethephon 9-5 525+225+1500
T2 瑞脱龙+助剂+乙烯利Ruituo dragon+assistant+ethephon 9-5, 9-10 525+225+1500
T3 脱吐隆+速捷+乙烯利Tuotulong+ assistant+ethephon 9-5 225+1350+1500
T4 脱吐隆+速捷+乙烯利Tuotulong+ assistant+ethephon 9-5, 9-10 225+1350+1500
T5 乙烯利Ethephon 9-5 1500
T6 乙烯利Ethephon 9-5, 9-10 1500
T7 对照Contrast - -

Fig.1

Daily minimum temperature, maximum temperature and average temperature statistics before and after spray"

Table 2

Effects of different defoliation treatment on cotton leaf abscission rate %"

处理
Treatment		 施后2d
2d after spray		 施后4d
4d after spray		 施后6d
6d after spray		 施后8d
8d after spray		 施后10d
10d after spray		 施后15d
15d after spray		 施后20d
20d after spray
T1 4.6±0.2a 21.4±2.0a 50.1±4.7a 73.0±7.6a 78.0±7.3ab 83.6±8.7a 87.1±9.3a
T2 5.5±1.6a 21.7±3.1a 46.4±6.1a 73.1±5.7a 82.1±3.5a 86.9±2.5a 91.5±4.2a
T3 5.9±1.5a 16.3±5.2a 41.5±2.2abc 69.9±1.9a 74.4±3.7b 79.3±0.1ab 81.5±0.5ab
T4 4.7±1.0a 15.6±4.6a 42.0±8.1ab 66.4±5.9a 71.2±5.6b 79.7±7.3ab 81.9±6.9ab
T5 5.9±0.7a 15.9±0.5a 30.7±8.6bc 51.5±8.1b 59.6±7.8c 68.6±12.2bc 71.2±7.6b
T6 5.7±2.1a 19.7±4.7a 32.1±2.3bc 50.5±8.0b 55.1±8.4c 63.5±6.2c 71.6±1.2b
T7 3.2±0.1a 14.1±0.7a 17.7±3.8d 27.5±5.6c 32.3±6.8d 37.7±5.5d 41.2±5.6c

Table 3

Effects of different defoliation treatment on cotton boll opening rate %"

处理
Treatment		 施前
Before spray		 施后2d
2d after spray		 施后4d
4d after spray		 施后6d
6d after spray		 施后8d
8d after spray		 施后10d
10d after spray		 施后15d
15d after spray		 施后20d
20d after spray
T1 30.0±6.8ab 36.8±8.2ab 43.0±2.1ab 52.6±5.9ab 65.1±5.4ab 69.9±6.1ab 83.4±2.4ab 95.0±3.4a
T2 33.4±2.4ab 44.9±4.9a 52.3±0.1a 62.2±1.1a 70.7±0.7a 75.6±3.5a 86.5±0.7ab 94.4±1.2a
T3 30.0±8.1ab 37.9±10.5ab 46.4±5.9ab 59.4±8.4a 71.4±7.3a 76.6±8.6a 90.1±1.8a 93.3±0.3a
T4 40.2±8.5a 43.6±9.9a 47.6±10.6a 54.8±11.0ab 63.8±10.3ab 79.0±1.5a 91.7±3.1a 96.5±4.9a
T5 25.0±2.1b 30.5±1.5ab 40.2±6.5ab 49.4±4.9ab 61.1±6.0ab 66.3±8.2ab 80.8±5.8ab 90.6±1.0a
T6 21.6±7.6b 33.7±2.8ab 40.4±4.7ab 47.4±9.7ab 65.6±6.5ab 72.4±9.4ab 86.4±4.3ab 93.8±4.8a
T7 19.6±1.3b 25.4±1.4b 28.5±1.8b 33.7±0.3b 50.4±8.7b 54.8±7.4b 71.5±5.0b 79.5±9.7b

Table 4

Effects of different defoliation treatment on cotton yield and its related traits"

处理Treatment 单铃重Boll weight (g) 子指Seed (g) 衣分Lint percentage (%) 籽棉产量Seed cotton yield (kg/hm2) 实际密度Actual density (plant/hm2)
T1 6.4a 11.2a 42.5a 4 884 ±29a 104 805±123a
T2 6.1a 11.2a 41.1a 4 901 ±218a 103 695±108a
T3 6.2a 11.0a 42.1a 5 067±333a 101 132±46a
T4 6.3a 11.5a 41.3a 4 901±444a 103 561±189a
T5 6.2a 11.2a 40.8a 5 084±153a 103 321±213a
T6 6.0a 10.7a 41.5a 4 950±100a 102 987±186a
T7 6.1a 11.2a 41.6a 4 950±312a 103 389±98a

Table 5

Effects of different defoliation treatment on cotton quality"

处理
Treatment		 绒长(mm)
Fibre length		 整齐度指数(%)Uniformity index 马克隆值
Micronaire		 断裂比强度(cN/tex)
Breaking tenacity		 短纤维指数(%)
Short fiber index		 棉纤维成熟度比
Cotton fiber maturity
T1 31.54a 86.57a 4.35a 33.85a 6.67a 0.84a
T2 32.18a 85.63a 4.27a 34.38a 6.42a 0.84a
T3 31.95a 86.38a 4.19a 33.95a 6.52a 0.84a
T4 32.13a 86.53a 4.20a 35.00a 6.48a 0.84a
T5 32.34a 85.92a 4.38a 34.22a 6.42a 0.85a
T6 32.25a 85.73a 4.50a 32.92a 6.45a 0.84a
T7 32.02a 86.22a 4.30a 34.20a 6.48a 0.84a
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