Effects Of Biochar On Soil Microbes And Crops

Biochar is made fromstraw, corn cobs, husks and other biomass by pyrolysisin the absence of oxygen conditions. The porous structure and large surface area of biochar is good for accumulation of nutrients and water, so it provides a suitable habitat for microorganisms when added to soil.Because incorporation of biochar into soil may indirectly increases crop yields by promoting the growth and activity of some soil functional microorganisms, biochar hasgreat application prospects in agriculture.The influencesof rice husk biochar, corncob biochar, and bamboo biochar before and after washing with water on the growth of 12 different soil microorganismsas well as theiradsorption capacities were studied respectively. In addition, biochar alone or accompanied with bacteria were addedinto the soil before corn planting. Plant height, leaf area, chlorophyll content and other growth index were detected in seeding stage of corn.The results showed that adding biocharcould promote the growth of some microorganisms, and certain bacteria could adsorb on the surface or the interior of biochar. There was a huge variability in physical biochar structuresdepending on the parent material and the conditions present attheir formation, which lead to different effects on the growth and adsorption of the same bacterium. At the same time, different microorganisms had different nutritional requirements and characteristics, so the same biochar also had different effects on the growth and adsorption of different bacteria.It was found that adding biochar and bacteria together significantly increased the growth index of corn, so the interaction between biochar and functional microorganisms could promote the growth of corn in seeding stage.