Analysis and evaluation of soil fertility of greenhouse vegetable field in northwest Hebei province
WANG Ji-qing, LIU She-ping, LI Zhan-tai, AN Wen-bo, ZHANG Bao-yue
HUBEI AGRICULTURAL SCIENCES . 2019, (7): 39 -42 .  DOI: 10.14088/j.cnki.issn0439-8114.2019.07.009