01033nam a2200193Ia 4500 CTU_154107 210402s9999 xx 000 0 und d 94 631.417 S683 Soil organic matter in sustainable agriculture Edited by Fred Magdoff, Ray R. Weil Boca Raton CRC Press 2004 This textbook contains evaluations of the types of organic soil constituents-organisms, fresh residues, and well-decomposed substances. It explores the beneficial effects of organic matter on soil and the various practices that enhance SOM. Chapters include an examination of the results of crop management practices on soil organisms, organic matter gains and losses, the significance of various SOM fractions, and the contributions of fungi and earthworms to soil quality and crop growth Humus,Soil ecology,Sustainable agriculture Bạch Trúc Trung tâm Học liệu Trường Đại học Cần Thơ