he contents of nitrogen and carbon in plants,including cultivated and wild plants, and soils in the Haihe River Basin were characterized. It was found that the plants growing in thisarea had an average N content of about 2%with a maximum of about 6%,and few species ofthem had an average N content of 3%─4%。Different types of plant might have different Ncontents. Vegetable crops were found to have the highest value while ferns and mosses ha-ving the lowest value,Most of the plants had an average C content of ...