Nitrogen in agricultural soils / edited by Frank J. Stevenson. Stevenson, F. J. Soils Nitrogen content. Plants Effect of nitrogen on. Crops and soils. Nitrogen fertilizers. S592.6.N5 N566 1982 631.416 19 N731 Includes index. Madison, Wis. : American Society of Agronomy, 1982. 1982. 1982 Text xx, 940 p. : eng Agronomy ; no. 22