黄河中游土壤有机质与氮磷相关性分析

韩凤朋;张兴昌;郑纪勇

Relativity Analysis on Soil Organic Matter with Nitrogen and Phosphorus of the Middle Yellow River

HAN Feng-peng;ZHANG Xing-chang;ZHENG Ji-yong

人民黄河 . 2007, (4): 58 -59 .