The influence of brown coal on physico-chemical properties of sandy soils
2009
Maciejewska, A., Warsaw University of Technology, Warsaw (Poland) | Kwiatkowska-Malina, J., Warsaw University of Technology, Warsaw (Poland)satidsasa
A steady decline of organic matter in soils in Poland is observed, therefore the pending problem and new challenge for soil and environmental scientists is to increase its level, particularly in sandy soils. A growing interest was observed in last decades in different sources of organic matter, for example from brown coal, its derivatives and composts that are considered as an important source of enriching the soil with organic matter. The Rekulter - a brown coal preparation was introduced 20 cm deep into the soil in autumn 1987 at 2 doses of 80 and 160 t per ha. Applying the Rekulter resulted in changes of physicochemical properties of the soil. One year after application, the highest increase in soil reaction pH (pHH2O=7.5; pHKCl=7.4) was found in the case of higher dose of Rekulter, and the same behavior (pHH2O=7.2; pHKCl=6.4) was observed 20 years after its application. In objects with higher dose of the Rekulter, the TOC decreased from about 20 g per kg after 1 year to 15 g per kg after 20 years of its application. The highest growth of the Nt content of 1.1 g per kg (1988) and 0.9 g per kg (2008) occurred at higher dose of the Rekulter. The highest value of TOC to Nt ratio of 20 obtained for soil sample with higher dose of the Rekulter was due to the highest carbon content in this object.
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