| Regulation effects of different combinations of exogenous substances on chemical topping cotton |
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| DOI：10.7606/j.issn.1000-7601.2021.05.25 |
| Key Words: cotton exogenous substances combined spraying dry matter accumulation yield quality |
| Author Name | Affiliation | | MA Chunmei | College of Agriculture, Xinjiang Agricultural University, Engineering Research Centre of Cotton, Ministry of Education, Urumqi, Xinjiang 830000, China | | WU Xueqin | College of Agriculture, Xinjiang Agricultural University, Engineering Research Centre of Cotton, Ministry of Education, Urumqi, Xinjiang 830000, China | | LI Jiangyu | College of Agriculture, Xinjiang Agricultural University, Engineering Research Centre of Cotton, Ministry of Education, Urumqi, Xinjiang 830000, China | | TIAN Yangqing | College of Agriculture, Xinjiang Agricultural University, Engineering Research Centre of Cotton, Ministry of Education, Urumqi, Xinjiang 830000, China | | ZHAO Qiang | College of Agriculture, Xinjiang Agricultural University, Engineering Research Centre of Cotton, Ministry of Education, Urumqi, Xinjiang 830000, China |
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| Abstract: |
| In 2019-2020, ‘Yan Cotton 67’ was used as a material in Changji and Korla, Xinjiang, respectively, to explore the regulatory effects of different combinations of exogenous substances on growth, development, yield, and quality of the cotton. Three combinations of exogenous substances of compound sodium nitrophenolate 15 g·hm-2 (AU1), compound sodium nitrophenolate 15 g·hm-2+Phthalanillic acid 75 g·hm-2 (AU2), and compound sodium nitrophenolate 15 g·hm-2+ Phthalanillic acid 75 g·hm-2+ Prohexadione calcium 30 g·hm-2 (AU3) were used as treatment groups. Water was used as control group (CK). The changes of plant height, number of fruit branches, chlorophyll content, dry matter accumulation and distribution, yield, and quality of cotton after spraying exogenous substances before and after topping were recorded and analyzed by random block experiment. The results showed that three combinations of exogenous substances effectively adjusted the height of cotton plant, and improved the number of fruit shoots, chlorophyll content, dry matter accumulation and yield of cotton, of which the average two\|year fruit shoots of AU3, AU2, and AU1 increased by 4.48%, 7.68% and 8.51%, respectively, when compared with CK. The regulatory effect of exogenous substances on cotton reproductive growth was greater than that of vegetative growth, the two\|year average reproductive organ mass (buds, flowers, and bolls) treated by AU3, AU2, and AU1 increased by 23.58%, 19.38%, and 13.46% compared with CK, respectively. Cotton yield increased with the increase of exogenous regulator combination types, among which AU3 had the highest yield increase rate as compared with CK, and the average yield increase rate for 2 years was 15.84%. The cotton lint percentage of AU3 was significantly increased only in 2019, which was 2.30% higher than that of CK, but had no effect on fiber quality. Therefore, the combination of compound sodium nitrophenolate 15 g·hm-2+ Phthalanillic acid 75 g·hm-2+ Prohexadione calcium 30 g·hm-2 was the best option. |
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