PROPERTIES OF SOIL AND ELEMENTAL COMPISITION OF HUMIC ACIDS AFTER TREATMENT WITH BROWN COAL AND COW MANURE

摘要

Soil organic matter (SOM) is an essential soil constituent, influencing soils' physical, chemical and biological properties. Recently, a growing interest in looking for alternative sources of organic matter, such as for example brown coal waste material and compost has been observed. It was found that brown coal waste material or cow manure, 10 years after application in soil resulted in changes in physicochemical properties of the soil and structure of humic acids (HAs) extracted from the soil. HAs extracted from the soil treated with brown coal waste material had higher carbon and lower nitrogen contents compared to the samples to which cow manure was added. HAs of amended soils had higher content of oxygen functional groups compared with non-treated ones. Therefore, brown coal waste material may be an equivalent to natural sources of SOM in terms of agriculture and ecosystems protection.