| Effects of tillage depth on cotton growth and canopy microclimate under mulched drip irrigation |
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| DOI：10.7606/j.issn.1000-7601.2022.04.09 |
| Key Words: cotton mulched drip irrigation tillage depth growth canopy field microclimate |
| Author Name | Affiliation | | CHEN Wenjuan | College of Sciences,Shihezi University, Shihezi, Xinjiang 832000, China | | HU Xiaotang | Agricultural College, Shihezi University, Shihezi, Xinjiang 832000, China | | LI Qinglin | College of Water & Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China | | HAN Han | College of Water & Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China | | ZHANG Jinhua | College of Water & Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China |
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| Abstract: |
| To explore the effect of tillage depth on microclimate and cotton growth under mulched drip irrigation, field trials in Korla of Xinjiang, China carried out from April to October 2019. Three tillage depths of 20 cm, 30 cm, 40 cm (T20, T30, T40) and no tillage (NT) as a control were set up. The effects of tillage depth on soil porosity, farmland water consumption, field microclimate, cotton growth and cotton yield were analyzed. The results showed that the increase of tillage depth effectively increased soil temperature of inner\|membrane tillage layer and promoted plant water consumption. The controlling effect of the water consumed by cotton plants from the soil in the membrane on the canopy microclimate was greater than that of the soil water evaporation outside the membrane on the canopy microclimate. The total farmland water consumption in NT, T20, T30 and T40 treatments in the membrane was 2.48, 2.52, 3.08 and 3.47 times of that outside the membrane, respectively. During the full cotton growth period, the total farmland water consumption of T20, T30 and T40 treatments was 1.30, 1.42 and 1.52 times than that of the NT treatment, respectively. The increase of farmland water consumption caused by deep tillage effectively increased the canopy humidity, prolonged cotton growth period and increased cotton yield. During the whole growth period, the average canopy humidity near soil surface of tillage treatments (T20, T30, T40) was 12.38%, 14.49% and 17.50% higher than that of NT treatment, respectively, and the whole growth period of cotton were 10d, 16d, 23d longer than the NT treatment, respectively. The cotton yield was 670.68 kg·hm-2, 1 252.67 kg·hm-2, 1 584.02 kg·hm-2 higher than those of NT treatment. The results of this study are of great significance for understanding the mechanism of tillage measures to improve cotton yield in Xinjiang, China. |
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