聊城市典型农业区耕地土壤养分元素地球化学特征
张文强, 李常锁, 刘金鑫, 程诗悦, 滕跃, 李根林

Geochemical characteristics of soil nutrient elements in cultivated land within a typical agricultural area, Liaocheng City, China
ZHANG Wen-Qiang, LI Chang-Suo, LIU Jin-Xin, CHENG Shi-Yue, TENG Yue, LI Gen-Lin
表4 土壤养分地球化学综合评价等级划分
Table 4 Classification of soil nutrient geochemistry comprehensive evaluation grades
等级
f养综 ≥4.5 4.5~3.5 3.5~2.5 2.5~1.5 <1.5