The effect of four different pasture species compositions on nitrate leaching losses under high N loading

Nitrate ( NO 3 − ) leaching can cause elevated concentrations of NO 3 − ‐N in water, which can have adverse impacts on water quality and human health. In grazed pasture systems, most of the NO 3 − ‐N leaching occurs beneath animal urine‐ N deposits. The objective of this study was to investigate the effect of four different pasture species compositions [perennial ryegrass/white clover ( P. ryegrass WC ), tall fescue/white clover ( T. fescue WC ), Italian ryegrass/white clover ( It. ryegrass WC ) and perennial ryegrass/Italian ryegrass/white clover/red clover/chicory/plantain ( Diverse )] on NO 3 − ‐N leaching losses from animal urine patches, and to examine the relative importance of root system architecture and seasonal activity to reduce NO 3 − ‐N leaching losses. The results show that NO 3 − ‐N leaching losses were 24–54% lower beneath It. ryegrass WC than other pasture species. Total dry matter ( DM ) yield in the season following establishment was 11–58% greater in the It. ryegrass WC pasture, while average winter daily N uptake rate of It. ryegrass WC over the two seasons was on average 58% greater than P. ryegrass WC and T. fescue WC . In the second season, the P. ryegrass WC and T. fescue WC pastures had up to 140 and 82% more roots between 0 and 40 cm depth, respectively, than the other pasture species compositions. These results suggest that in grazed pasture systems, high plant winter activity (plant growth/root metabolic activity) is more important than specific root architecture (e.g. deep roots) to reduce NO 3 − ‐ N leaching losses.