Consequences of 33 years of plastic film mulching and nitrogen fertilization on maize growth and soil quality - Ding, Fan (Shenyang Agricultural University. College of Land and Environment) ; Li, Shuangyi (Shenyang Agricultural University. College of Land and Environment) ; Lu, Jie (Shenyang Agricultural University. College of Land and Environment) ; Penn, Chad J. (Estats Units d'Amèrica. Departament d'Agricultura) ; Wang, Qing-Wei (Chinese Academy of Sciences. Institute of Applied Ecology) ; Lin, Guigang (Chinese Academy of Sciences. Institute of Applied Ecology) ; Sardans i Galobart, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Wang, Jingkuan (Shenyang Agricultural University. College of Land and Environment) ; Rillig, Matthias (Freie Universität Berlin. Institut of Biology)