01305nam a2200217Ia 4500 CTU_108454 210402s9999 xx 000 0 und d 631.44 W927 World reference base for soil resources 2006 : A framework for international classification, correlation and communication Rome FAO 2006 This publication is a revised and updated version of "World Soil Resources Reports No. 84", a technical manual for soil scientists and correlators, designed to facilitate the exchange of information and experience related to soil resources, their use and management. The document provides a framework for international soil classification and an agreed common scientific language to enhance communication across disciplines using soil information. It contains definitions and diagnostic criteria to recognize soil horizons, properties and materials and gives rules and guidelines for classifying and subdividing soil reference groups. Thực tập giáo trình,Hóa lý đất,Thực tập giáo trình NN698,NN685,NN712 Soils Classification Minh Trung tâm Học liệu Trường Đại học Cần Thơ