an introduction to nutrient management Havlin, John. Beaton, James D. Tisdale, Samuel L. Nelson, Werner L. New Delhi Prentice Hall of India 2006 7th ed. xi, 515 p. : ill. ; 23 cm. (Pbk) John L. Havlin ... [et al.]. Includes bibliographical references and index Fertilizers Soil fertility Crops Nutrition 631.8 812033017X ENG-85211 D.B.Act / Pub