| Effect of irrigation frequency on the growth and development of chemical topping cotton |
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| DOI：10.7606/j.issn.1000-7601.2017.06.06 |
| Key Words: cotton chemical detopping irrigation frequencies dry matter accumulation nitrogen uptake boll retention abccission rate agronomic character |
| Author Name | Affiliation | | NIE Zhi-yong | Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | KANG Zheng-hua | Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | CUI Yue | Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | JIA Xi-ning | Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | ZHAO Qiang | Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| The influence of four irrigation frequencies on dry matter accumulation, nitrogen absorption & utilization and agronomic traits of cotton with chemical and manual topping treatment were compared and analyzed. Xinluzao No.57 was used as the test material with four irrigation frequencies (6 times, 8 times, 10 times and 12 times) adopted in main plot (split-plot test design) and chemical & manual topping treatment adopted in secondary plot. The results showed that there was a positive correlation between irrigation frequency and yield, and the rapid accumulation of dry matter was prolonged with the increase of frequency of irrigation, extending for up to 18d. Under different irrigation frequency, the period that chemical topping cotton's rapid accumulation of dry matter was 1～5 d longer than the artificial topping cotton, showing that increasing the irrigation frequency and chemical capping both prolonged the rapid accumulation period of dry matter, increased the accumulation of dry matter and the amount of nitrogen uptake. Under different irrigation frequency, the abscission rate of chemical topping cotton buds and bolls was 2.47%～9.21% higher than artificial topping cotton. Under chemical topping and artificial topping, the changes of single boll weight were 0.06～0.49 g and 0～0.28 g respectively, and the changes of seed index were 0.19～1.67 g and 0.11～0.81 g. These indicate that chemical topping cotton plants are more sensitive to water and fertilizer, and that chemical topping can prolong the growth period of cotton plants to make cottonseed more full and have high quality breeding potential. |
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