
%0 Journal Article
%A Roygard, J. K. F. 
%A Bolan, N. S. 
%A Clothier, B. E. 
%A Green, S. R. 
%A Sims, R. E. H. 
%T Short rotation forestry for land treatment of effluent: a lysimeter study
%J Soil Research
%D 1999/08/12
%V 37
%N 5
%P 983-992
%K dairy-farm euent, Eucalyptus nitens, Eucalyptus saligna, nitrate, Salix kinuyanagi.
%R https://doi.org/10.1071/SR98067
%U https://www.publish.csiro.au/paper/SR98067 
%X Land treatment of wastewater using short rotation forestry (SRF) has potential as a sustainable method for disposal of dairy-farm euent. We compared 3 SRF species, 2 evergreen species of eucalypts (Eucalyptus nitens, E. saligna) and a deciduous willow (Salix kinuyanagi), in the land treatment of dairy-farm euent. The trees were grown in lysimeters (1 . 8 m diameter, 1 . 0 m depth), and a bare soil treatment was used as a control. The application of dairy-farm oxidation-pond euent totalled 218 g N/lysimeter (equivalent to 870 kg N/ha) over 2 irrigation seasons (December 1995&#8211;June 1996 and September 1996&#8211;April 1997). Euent was applied weekly in summer at a rate of 18 . 9 mm/week. No euent was applied during the winter period. The evapotranspiration (ET) rates of the trees, and the volumes and nitrogen contents of the leachates are compared for a winter period (4 weeks) and a summer period (5 weeks). The biomass accumulation and the uptake of nitrogen by the 3 tree species were also investigated. The SRF trees improved the renovation levels of dairy-farm euent and produced biomass suitable for energy conversion. Of the 3 tree species, only the S. kinuyanagi treatments maintained leachate nitrate concentrations below the New Zealand drinking water standard of 11 . 3 mg NO&#8211; 3 -N/L throughout both the winter and summer periods. The E. nitens treatment produced significantly more oven-dry biomass (19 . 1 kg/tree) than the E. saligna trees (9 . 7 kg/tree) (P = 0 . 05). The S. kinuyanagi treatment had intermediate production (13 . 3 kg/tree) and was not significantly different from the other 2 tree species (P = 0 . 05). The nutrient accumulation was not significantly different among the species (P = 0 . 05). S. kinuyanagi was considered the best overall performer for the land treatment of dairy-farm euent, based on the concentrations of leachate moving beyond the root-zone. 
