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Soil water characteristic in relation to textural composition and organic matter content under biochar application
Proceedings of the 2020 Mississippi Water Resources Conference
Year: 2020 Authors: Li Y., Feng G., Tewolde H.
Estimating soil water hydraulic characteristics from readily available physical parameters has been a long term goal of soil physicists and engineers. Several equations were developed according to the relationships between soil water characteristics, soil texture and soil organic matter and commonly applied to hydrologic analyses. Especially the hydrological equations of Saxton et al. (2006) performed the best. BC, as is a valuable soil amendment, has been reported to have a positive effect on the soil health. Thus it may affect on soil water characteristics because of its inherent properties such as high pH, high cation exchange capacities (CEC), high specific surface area and soil organic matter. Thus, a hydrological equation for biochar addition to soil should be found or calibarated and then was compared to the hydrological equations of Saxton et al. (2006) to evaluate soil water infiltration, conductivity, storage, and plant-water after biochar addition. In this study, we collect 180 soil samples in four farmer fields applied biochar at 6.73 Mg/ha every year by spreading way on soil surface for almost 5-10 years. We will measure and get soil water characteristics curve; bulk densities; sand (S), silt and clay (C) particle sizes and organic matter of 0-5 cm (A), 5-10 cm (B) and 10-15 cm (C) layers. Then the regression equations were developed and the comparison between the new hydrological equations and hydrological equations of Saxton et al. (2006) will be analyzed. The experiment and result are still in progress.