Preliminary study on the subject concerning fuzzy assessment method of soil fertility based on field scale
WU Yu-hong, TIAN Xiao-hong, HOU Yong-hui, ZHOU Mi, TONG Yan-an
JOURNAL OF NATURAL RESOURCES . 2009, (8): 1422 -1431 .  DOI: 10.11849/zrzyxb.2009.08.011