Determining Sludge Fertilization Rates for Forests from Nitrate-N in Leachate and Groundwater

  • Author(s): Brockway, D.G.; Urie, D.H.
  • Date: 1983
  • Station ID: Miscellaneous Publication-SRS-

Abstract

Municipal and papermill wastewater sludges were applied to conifer and hardwood forests growing on sand soils (Entic Haplorthods, Spodle Udipsamments, and Alfic Haplothods), in northwestern Lower Michigan where annual precipitation averages 765 mm/y.To investigate the impact of sludge on nitrate-N concentrations in soil water and groundwater.During the first growing season after treatment, all forms of N in groundwater and soil water remained near background levels except under aspen (Populus grandidentata Michx.) plots treated with 46 dry Mg municipal sludge/ha.Following the first spring snowmelt period after sludge was applied (spring 1977), nitrate-N concentrations exceeded the 10 mg/L potable water standard in groundwater under plots treated with 16 or more dry Mg/ha undigested papermill sludge.Soil leachate exceeded 10 mg/L under pine plantations receiving 19.3 dry Mg/ha and aspen sprout stands receiving 23 dry Mg/ha or more anaerobically digested municipal sludge. Sludge applications rates which would not degrade water quality in water-table aquifers were estimated by regression analysis of nitrate (NO3-) concentrations in relation to dry solids loading.Applying raw papermill sludge at rates not exceeding 9.5 dry Mg/ha (670 kg total N/ha) to a red pine (Pinus resinosa Ait.) planatation was found to be consistent with levels that met the 10 mg/L potability standard in groundwater.The analyses showed anaerobically digested municipal sludge could be applied to a red pine and white pine (Pinus strobus L.) plantation at 16.5 Mg/ha (990 kg total N/ha) or less and to aspen sprouts at rates up to 19 dry Mg/ha (1140 kg total N/ha) with the same water quality limits.

  • Citation: Brockway, D.G.; Urie, D.H. 1983. Determining Sludge Fertilization Rates for Forests from Nitrate-N in Leachate and Groundwater. Journal of Environmental Quality 12(4): 487-492.

Requesting Print Publications

Publication requests are subject to availability. Fiscal responsibility limits the hardcopies of publications we produce and distribute. Electronic versions of publications may be downloaded, distributed and printed.

Please make any requests at pubrequest@fs.fed.us.

Publication Notes

  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
  • Our online publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact the SRS webmaster if you notice any errors which make this publication unusable.
  • To view this article, download the latest version of Adobe Acrobat Reader.