Factors that influence the groundwater quality in agricultural soils

Input of fertilizers and pesticides can be highly effective means to increase crop yield. Unfortunately, the increasing use of agrochemicals has also created environmental problems of which degraded water quality is considered one of the most serious. In order to control agricultural pollution, a better quantitative and qualitative understanding is needed of the effect of different soils and climatic conditions in the unsaturated zone. Therefore, interest in using mathematical models has rapidly increased, for the purpose of analyzing the behavior of water and chemicals in agricultural soils, and for policy evaluation and management.