|
|
The influence of Biochar Cultivation in Soil on its Physicochemical Characteristics
Hladký, David ; Sovová, Šárka (referee) ; Kalina, Michal (advisor)
This bachelor thesis is focused on the effect of soil factors on the physical-chemical characteristics of biochar. It describes the change in biochar after a long-term cultivation experiment, as well as, sequential leaching that was implemented on a shorter time scale. The theoretical part describes individual physical-chemical characteristics, structure, possible applications and optimal methods of biochar characterization. In the thesis, we have learnt why biochar is called a soil conditioner, not a fertilizer. The experimental part deals with the study of changes in the physicochemical characteristics of biochar after the cultivation experiment. These results are compared with the sequential leaching of biochar in selected media (water, citric acid, hydrogen peroxide) that simulate the effects that can act on biochar in soil. The experimental results show the similarity of individual observed values of the samples after the long-term cultivation experiment and sequential extractions. It can be seen that the alkaline nature of biochar is caused by salts of alkali metal and alkaline earth metal. Mostly due to the presence of potassium in the biochar structure and then also the presence of calcium and sodium. These ions are also the explanation of the high conductivity, which together with pH, decreases significantly after five leaching cycles, and stabilize after a two-year cultivation period. All biochars samples used in the work have a high content of organic matter, which is a optimal prerequisite for the use in agriculture and the improvement of soil properties.
|
guest ::
