Pedosphere 34(6): 1136--1145, 2024
ISSN 1002-0160/CN 32-1315/P
©2024 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effects of metal oxide nanoparticles on soil water retention curve and tensile strength |
Elahe DARAEI1, Hossein BAYAT1 , Pouya ZAMANI2 |
1 Department of Soil Science and Engineering, Faculty of Agriculture, Bu-Ali Sina University, Hamedan 65178-38695 (Iran)
2 Department of Animal Science, Faculty of Agriculture, Bu-Ali Sina University, Hamedan 65178-38695 (Iran) |
| ABSTRACT |
| Generally, nanotechnology plays an very important role in various applied scientific fields. Iron and magnesium nanoparticles (NPs) can cause positive or negative changes in soil physical and mechanical properties, especially in long periods. The aim of this study was to investigate the multi-year effects of NPs on soil water retention and aggregate tensile strength. A wheat farm loamy soil was amended with 1%, 3%, and 5% (weight/weight) of magnesium oxide (MgO) and iron oxide (Fe3O4) NPs in three replications and incubated for three years. Water contents were measured at different matric suctions of 0, 10, 20, 40, 60, 100, 300, 1 000, and 15 000 cm. The van Genuchten model was fitted to the moisture data. Tensile strength was measured on the 2-4 mm aggregates at matric suctions of 300 (i.e., field capacity) and 15 000 (i.e., permanent wilting point) cm. The results showed that the levels of 1% and 3% Fe3O4 NPs significantly increased water retention, compared to the no NP application control and 5% MgO NPs, which is probably due to the increase of adsorption surfaces in the treated soils. Water contents at field capacity and permanent wilting point in the 5% MgO NP treatment decreased compared to those of the other treatments, due to the increased soil vulnerability and reduced soil fine pores. The application of Fe3O4 NPs did not have any significant effect on soil tensile strength. Based on the results of this study, soil physical and mechanical properties could be affected by NP application. |
| Key Words: field capacity,iron oxide nanoparticles,magnesium oxide nanoparticles,matric suction,permanent wilting point,soil water content,surface morphology,van Genuchten model |
| Citation: Daraei E, Bayat H, Zamani P. 2024. Effects of metal oxide nanoparticles on soil water retention curve and tensile strength. Pedosphere. 34(6): 1136-1145. |
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