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| Effects of different films mulching on salt and heat changes and yield of spring maize farmland |
| LIANG Xiaoyang1, SHEN Xin2, WANG Chuanjuan1*, ZHANG Yanqun3, WANG Dongbo3,4, WANG Jiandong1, GUO Qinghua5 |
| 1. Institute of Environment and Sustainable Development in Agriculture, CAAS, Beijing 100081, China; 2. National Agro-Tech Extension and Service Centre, Beijing 100125, China; 3. Department of Irrigation and Drainage, China Institute of Water Resources and Hydropower Research, Beijing 100048, China; 4. School of Water Conservancy and Hydroelectric Power, Hebei University of Enginee-ring, Handan, Hebei 056038, China; 5. Yantai City Water Project Operation and Maintenance Center, Yantai, Shandong 264003, China |
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Abstract Clarifying the field application effects of different types of film mulching technologies is of great scientific significance for promoting green and efficient mulching technologies. Taking spring maize under surface irrigation in Hetao Irrigation District as the research object, the effects of four mulch types, including non-mulching(CK), conventional polythene mulching(PE), high-strength recyclable mulching(HS), and biodegradable mulching(BP), on soil temperature, salt transport, maize growth, yield and water use efficiency(WUE)during the entire growth period of spring maize were quantitatively analyzed. The results of this study show that the effective accumulated temperature of the main root zone(0-40 cm)of PE, HS and BP increases by 64.1, 61.4, 52.5 ℃, respectively, compared with CK at 60 days after sowing. Mulching inhibits the occurrence of salt migration upward and surface aggregation, and the occurrence of surface accumulation. In the 10 cm soil layer, the mass fractions of soil salt decrease by 45.0%(HS), 37.0%(BP)and 17.9%(PE), respectively, compared with CK. Film mulching measures can accelerate the process of maize growth and development and improve the quality of aboveground dry matter in the early growth stage of spring maize. Compared with CK, the yield and WUE of PE, HS, BP treaments are significantly increased by 12.8%, 10.3%, 14.3% and 12.8%, 4.8%, 17.0%(P<0.05), respectively. The yield of spring maize is significantly positively correlated with the effective accumulated temperature of 10 cm soil layer during the entire growth period(R2=0.758 18)and the aboveground dry matter accumulation at harvest(R2=0.510 86). Both high-strength plastic mulch film and biodegradable mulch film have positive impacts on increasing temperature, salt pressure, as well as crop yield, which may be promoted and applied in practical production in Hetao Irrigation District.
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Received: 17 June 2022
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