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| DOI：10.13522/j.cnki.ggps.2019154 |
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| The impact of N application and drip irrigation amount on cotton growth and water and n distributions in soil mulched with film |
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ZHONG Zhibo, ZHAI Guoliang, DENG Zhong, CAI Jiumao, GU Shaowei, WANG Guodong
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1. Farmland Irrigation Research Institute, Chinese Academy of Agricultural Institute/ Key Laboratory of Water-saving Irrigation Engineering, Ministry of Agriculture and Rural Affairs, Xinxiang 453002, China; 2. Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China; 3. Institute of Water and Soil Fertilizer, Xinjiang Academy of Agricultural Reclamation Sciences, Shihezi 832000, China
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| Abstract: |
| 【Objective】The purpose of this paper is to experimentally determine the optimal water and nitrogen application for cotton grown in soil mulched with film and under drip irrigation.【Method】The experiment was conducted with four irrigation amounts: W1:5 250 m3/hm2,W2:4 500 m3/hm2,W3:3 750 m3/hm2 and W4:3 000 m3/hm2; and three nitrogen applications: N1:300 kg/hm2, N2:262.5 kg/hm2 and N3:225 kg/hm2. All treatments were organized in the two-factor randomized plots in the field. In each treatment, we measured plant morphology, soil water and soil nitrogen.【Result】Irrigation amount affected plant morphological traits more than nitrogen application, but the morphological traits were not closely related to cotton yield. Water content in the top soil decreased asymptotically to 20% from the budding stage to the flowering stage. It was found that irrigating 3 750 m3/hm2 of water was the best comprise to keep soil moist while not losing too much water to percolation. Nitrate and ammonium content in the top 0~20 cm soil was comparatively high, and with increase in irrigation amount and nitrogen application, nitrogen leaching increased monotonically. When the nitrogen application amount was 262.5 kg/hm2, nitrate in root zone was comparatively high due to the apparently enhanced nitrification. The yield peaked at 6 460.5 kg/hm2 when nitrogen application and irrigation amount were 262.5 kg/hm2 and 3 750 m3/hm2 respectively. 【Conclusion】In terms of affecting cotton growth and water and nitrogen distribution in soil, applying 262.5 kg/hm2 of nitrogen and irrigating 3 750 m3/hm2 of water was optimal for cotton grown in the studied area. |
| Key words: drip irrigation; film mulching; plant morphology; soil water; soil nitrate; soil ammonium |
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