00859nam a2200193Ia 4500 CTU_16852 210402s9999 xx 000 0 und d 631 S683/N72 C J Pearson FAO soils bulletin: N.72: Sustainable dryland cropping in relation to soil productivity C J Pearson, D W Norman, FAO, J Dixon Rome FAO 1995 The main themes of the Bulletin are that management of soil productivity is central to sustainable dryland cropping and that successful management depends on understanding the mechanisms underlying soil productivity and on the recognition of non-technical factors suach as human goals. soil science Nguyễn Quang Điền, 970611 Trung tâm Học liệu Trường Đại học Cần Thơ