Publication Date
1997
Description
The purpose of this multi-year study was to determine concentrations and transport of non-nitrogen nutrients in groundwater under a medium fertility pasture system. Rotationally grazed grass pastures received 56 kg N/ha annually as NH4NO3 for a 5-yr period. A topsoil pH of 6.0 and available P and K levels of 28 and 168 kg/ha, respectively, were maintained. Concentrations of P, K, Na, Ca, Mg, and Cl were measured in water from springs draining each paddock. Nutrient concentrations did not vary greatly on a monthly basis but there some increases during the second 5-yr period when annual N fertilizer rates were 168 kg/ha. Concentrations of K and Na changed very little; Mg changed little until the second 5 yrs when it increased gradually; Cl decreased slightly during the first 5 yrs and then increased rapidly during the second 5 yrs; P levels were low and decreased slightly throughout the study.
Citation
Owens, L B.; Van Keuren, R W.; and Edwards, W M., "Groundwater Concentrations of Non-Nitrogen Nutrients Under a Medium Fertility Pasture System" (2024). IGC Proceedings (1997-2023). 5.
https://uknowledge.uky.edu/igc/1997/session20/5
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Groundwater Concentrations of Non-Nitrogen Nutrients Under a Medium Fertility Pasture System
The purpose of this multi-year study was to determine concentrations and transport of non-nitrogen nutrients in groundwater under a medium fertility pasture system. Rotationally grazed grass pastures received 56 kg N/ha annually as NH4NO3 for a 5-yr period. A topsoil pH of 6.0 and available P and K levels of 28 and 168 kg/ha, respectively, were maintained. Concentrations of P, K, Na, Ca, Mg, and Cl were measured in water from springs draining each paddock. Nutrient concentrations did not vary greatly on a monthly basis but there some increases during the second 5-yr period when annual N fertilizer rates were 168 kg/ha. Concentrations of K and Na changed very little; Mg changed little until the second 5 yrs when it increased gradually; Cl decreased slightly during the first 5 yrs and then increased rapidly during the second 5 yrs; P levels were low and decreased slightly throughout the study.
