Effects of microsized rice straw on soil clay dispersibility

European Journal of Soil Science - Tập 73 Số 3 - 2022
Thu T.T. Tran1, Trang T. Dao1, Van M. Dinh1,2, Trang Vu1, Hue Thi Nguyen3, Nguyen Minh Phuong1, Thu H. A. Ngo4, Minh N. Nguyen1
1Faculty of Environmental Sciences, University of Science, Vietnam National University, Hanoi, Vietnam
2Faculty of Forestry Vietnam National University of Forestry Hanoi Vietnam
3Institute of Geography, Vietnam Academy of Science and Technology, Hanoi, Vietnam
4Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, Vietnam

Tóm tắt

AbstractThe incorporation of straw into soil has been encouraged as an alternative straw‐disposal strategy to the on‐site burning that occurs in many paddy regions. However, this practice may lead to changes in the colloidal properties of soil clays that potentially intensify clay and nutrient losses. This study aimed to demonstrate the effect of engineered microsized straw powder on the colloidal properties of two soil clays, that is, illitic and kaolinitic soil clays. Dynamic light scattering was coupled with the test tube method to evaluate time‐resolved changes in the particle size, zeta potential and dispersibility for the suspensions of straw powder and its mixtures with illitic and kaolinitic soil clays. Data from kinetic experiments over a time span of 20 days revealed that straw powder remarkably increased the dispersibility of soil clays. It was found that straw particles carried negative charges; thus, the introduction of straw powder into the clay suspensions increased the number of negative charges in the system, thereby increasing internal repulsive forces and eventually favouring clay dispersion. Moreover, certain mutual processes, that is, the biodegradation and dissolution of phytoliths (silica in straw), resulted in the release of dissolved organic matter and silicon, which aggravated clay dispersibility. In addition to the “traditional” awareness of the impacts of straw incorporation, for example, creating toxic, reduced environments or increasing CH4 emissions, the changes in the colloidal properties of soil clays should also be highlighted. We propose that the incorporation of straw requires additional solutions for the prevention of clay loss.Highlights Straw powder was examined for possible effect on colloidal properties of soil clays It was found that straw particles carried negative charges Introduction of straw powder increase repulsive forces and favor clay dispersion Microorganism, B. amyloliquefaciens, enhances the effect of straw powder

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European Journal of Soil Science

Tập 73 Số 3

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