TY - BOOK AU - Sparks, Donald L TI - Advances in agronomy SN - 9780120008094 U1 - 630.72 SPA PY - 2006/// CY - Amsterdam ; San Diego PB - Elsevier, Elsevier / Academic Press KW - Agronomy KW - Crops KW - Soil management N1 - Includes index ER -