**7. Conclusion**

Agricultural systems can provide negative impacts on soil properties, but practices such as crop rotation, crop succession, and no-till that improve soil organic matter can reverse negative impacts and maintain good soil physical, chemical, and biological properties. Soil organic matter increases aggregate stability and consequently modifies pore space dynamics. Soil structure controls the movement of water and solutes. The lack of conservation practices in agricultural soil management can lead to soil erosion processes and increase the transport of contaminants to groundwater.

Models for predicting water movement and solute transport in soils are important for understanding different scenarios of groundwater contamination and for improving appropriate soil management. Soil management needs to provide a land use that leads to sustainable agricultural systems, in addition to supporting crop development and food production.
