TY - BOOK AU - Nielsen, Donald R. AU - MacDonald, J.G. TI - Nitrogen in the environment SN - 0125184018 U1 - 631.847 21st ed. PY - 1978/// CY - New York PB - Academic Press KW - Environment KW - Field trials KW - Nitrogen KW - Soils - Nitrogen content N1 - V. 1: Nitrogen behaviour in field soil; Index: p. 523-26 ER -