河北省永清县农耕区土壤肥力主要指标现状评价

胡庆海, 李俊华, 王学求, 羿明璇, 吴慧, 田密

Evaluation of the primary soil fertility indices for the agricultural area of Yongqing County, Hebei Province

HU Qing-Hai, LI Jun-Hua, WANG Xue-Qiu, YI Ming-Xuan, WU Hui, TIAN Mi

图2 永清县表层土壤有机质(a)、全氮(b)、有效磷(c)、速效钾(d)地球化学等级

Fig.2 Geochemical map of organic matter(a), total nitrogen(b), available phosphorus(c) and available potassium(d) in surface soils in Yongqing County