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| Effect of film thickness on crop yield and soil environment |
| Received:August 06, 2016 |
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| KeyWord:thickness of agricultural plastic film;soil environment;crop yield;economic benefit;residual plastic film |
| Author Name | Affiliation | E-mail | | ZHANG Dan | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | | | WANG Hong-yuan | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | | | HU Wan-li | Institute of Agricultural Environment and Resources, Yunnan Academy of Agricultural Sciences, Yunnan 650205, China | | | YANG Hu-de | Institute of Soil, Fertilizer and Water-saving Agriculture, Gansu Academy of Agriculture Sciences, Lanzhou 730070, China | | | XU Yu | Institute of Agricultural Resources and Environment, Shandong Academy of Agricultural Sciences, Jinan 250100, China | | | MA Xing-wang | Institute of Soil Fertilizer and Water Saving, Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China | | | ZHAO Pei-yi | Institute of Plant Nutrition and Analysis of Inner-Mongolia Academy of Agricultural Sciences, Hohhot 010031, China | | | LIU Hong-bin | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | liuhongbin@caas.cn |
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| Abstract: |
| Film mulching in cropland is a key agricultural technique for increasing soil temperature, conserving soil moisture and improving crop yield in the arid and cold regions of China. This study aimed to inventory the application status of different thicknesses of films in China, and to investigate the effects of film thickness on crop yield and soil environment. Film application status was obtained by a national questionnaire-survey on 172 cotton fields, 99 maize fields, 30 potato fields and 58 peanut fields in 2011. Based on the survey, film thickness was categorized, and filed experiments were conducted from 2011 to 2013 to investigate the impacts of representative thicknesses of film on soil temperature, soil moisture content, crop yield, economic efficiency and the amount of residual film in Xinjiang, Gansu, Inner Mongolia and Shandong respectively for cotton, maize, potatoes and peanuts.Results showed that the most of China's mulching film were ultrathin, and 96.7% of the films surveyed had a thickness of 0.004~0.008 mm.Enhancing film thickness managed to improve soil temperature and moisture status, but it resulted in different yield responses depending on crops.An increase of film thickness from 0.004 to 0.012 mm increased yields of cotton and corn but decreased potato and peanut yields. Film thickness tended to influence farm economy, but the difference between treatments was no significant(P<0.05). Film thickness influence damounts of residual in the soil significantly(P<0.05). For all crops except potato, the amount of film residual was significantly negatively correlated with the film thickness(P<0.05). Despite a variation of effects on crop yields, increasing film thickness could reduce the strength of residual films in the soil, which would largely benefit collection of residual films.Therefore, we suggest an increase of the national standard of film thickness, for example to 0.010~0.012 mm as suggested by this study, to solve the severe problem of soil film residual in China. |
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