Nitrogen utilization and transformation in red soil fertilized with urea and ryegrass

摘要

１ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅａｒｅａｏｆｒｅｄｓｏｉｌｓｉｎＣｈｉｎａｃｏｖｅｒｉｎｇａｂｏｕｔｍｏｒｅｔｈａｎ２ｍｉｌｉｏｎｋｍ２ａｃｃｏｕｎｔｓｆｏｒ２２．７％ｏｆｔｈｅｗｈｏｌｅｃｏｕｎｔｒｙ’ｓａｒｅａ．［１］Ｍｏｓｔｏｆｔｈｅｒｅｄｓｏ...