It has long been recognized that soil organic matter is the key to soil fertility. As a nutrient store it gradually provides essential elements which the soil c

Soil organic matter - a perspective on its nature, extraction, turnover and role soil fertility. Influence of humic substances on growth and physiological proce

The fourth edition of Soil Microbiology, Ecology and Biochemistry updates this widely used reference as the study and understanding of soil biota, their functio