Effect of straw mulching on growth and yield of cotton under drip irrigation in arid area
Zhang Jinzhu1,2, Wang Zhenhua1,2, Hudan·Tumarebi3
1.College of Water & Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China; 2.Xinjiang Production & Construction Group Key Laboratory of Modern Water-Saving Irrigation, Shihezi, Xinjiang 832000, China; 3. School of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China
In order to explore the effect of straw mulching on growth characteristics and yield of drip irrigation of cotton in North Xinjiang, comparative trial in test-pit has been done from 2009 to 2012. Considering wheat straw as materials in the experiment, three treatments, surface coverage(LSM), 30 cm under the surface coverage(LM30)and no pit experiments(LUM), were carried out respectively. The results show that straw mulching has certain influence on the growth and yield of cotton under drip irrigation, especially in saline-alkali soil. Straw mulching has insignificant effect on drip irrigation cotton plant height, leaf area index and yield relatively in non-saline soil condition. The comprehensive regulation effect of surface coverage as well as the aspect of salt inhibition is better than that of LM30 especially in cotton growth period(flowering and boll-setting period). LM30 can create better conditions in seedling and cotton bud stage, but this effect is less pronounced after the blooming period. When the LSM is used, the highest yield of cotton can be obtained, which is 3.2%-17.9% higher than LUM and 3.1%-16.3% higher than LM30.
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