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ARS Home » Midwest Area » Bowling Green, Kentucky » Food Animal Environmental Systems Research » Research » Publications at this Location » Publication #304863
Title: Factors affecting transport of bacteria and microspheres through biochar-amended soils

Author
item Bolster, Carl
item ABIT, SERGIO - Oklahoma State University
item Cantrell, Keri
item QUIJANO, JESSAMINE - University Of California
item WALKER, SHARON - University Of California

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 6/12/2014
Publication Date: 10/7/2014
Citation: Bolster, C.H., Abit, S., Cantrell, K.B., Quijano, J., Walker, S. 2014. Factors affecting transport of bacteria and microspheres through biochar-amended soils. Meeting Abstract. Abstract.

Interpretive Summary:

Technical Abstract: We have investigated the role of biochar feedstock type (poultry litter extract and pine chips), biochar pyrolysis temperature (350 and 700 oC), biochar application rate (1, 2, and 10%), soil moisture content (saturated and 50% saturation), soil texture (1 and 12 % clay content), and surface properties on the transport of bacteria and microspheres through biochar-amended soils. Under most conditions we found that biochar addition to soils could significantly reduce bacterial and microsphere transport – in some cases up to five-orders-of-magnitude reduction in transport was observed. In general pine chip biochars were much more effective than poultry litter biochars at increasing microbial retention in our columns. Indeed, in some cases we observed an increase in microbial transport following addition of poultry litter biochars. High temperature biochars were generally more effective at increasing microbial retention in soils than low temperature biochars. Biochar addition to soils was observed to be more effective in partially saturated soils than fully saturated soils. We also found that bacteria with contrasting surface properties responded to biochar additions differently. Our results show that the addition of biochar can affect the retention and transport behavior of bacteria and that biochar application rate, biochar feedstock source, biochar pyrolysis temperature, soil moisture content, soil texture, and bacterial surface characteristics were all important factors determining the transport of bacteria through soil. Our results also suggest that the interactions between biochar and bacteria are complicated and need further investigations to determine the mechanisms involved.