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- In the special issue: Soil quality as an indicator of sustainable tillage practices / edited by D.L. Karlen.
- Marques da Silva, J.R. , Soares, J.M.C.N. , Karlen, D.L.
- soil erosion , tillage , plowing , plows , harrows , velocity , soil depth , soil quality , Portugal
- Journal Articles, USDA Authors, Peer-Reviewed