Effect of Ditching, Fertilization, and Herbicide Application on Groundwater Levels and Groundwater Quality in a Flatwood Spodosol
Groundwater levels and associated water quality parameters were studied in a young slash pine (Pinus elliottii Engelm.) plantation following ditching, fertilization, and herbicide application. Drainage ditches surrounding each watershed significantly lowered groundwater levels up to 45 m from the ditch for mean and high water table conditions. Drainage ditches were not deep enough to signifkantly influence groundwater levels during drier periods. A seasonal pattern in nutrient migration to the groundwater was exemplified by NH4-N, NO3-N, K, Ca, and Mg. Concentration of each nutrient was greatest in July following a dry spring. Potassium was the only nutrient which increased significally in &he groundwater due to fertilization. The herbicide sulfometuron methyl [methyl 2-[[[[L(4,6-dimethyl-2 pyrimidinyl)-amino] carbonyl] amino] sulfonyl benzoate] was not detected in any groundwater samples.