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TECHNICAL REPORTS

Waste Management

Field-Scale Application of Oily Food Waste and Nitrogen Fertilizer Requirements of Corn at Different Landscape Positions

Land Resource Science, University of Guelph, Guelph, ON, N1G 2W1, Canada

^* Corresponding author (trashid{at}uoguelph.ca)

Received for publication August 4, 2004. Oily food waste (FOG; fat + oil + greases) containing high concentrations of fat, oil and grease is produced by the food service, production, and processing industries. It has a high C to N ratio (90:1) and can recycle soil available N through immobilization and remineralization during its decomposition. Experiments were conducted at a farm (Hillsburg fine sandy loam; Typic Hapludalf) having rolling topography (5 and 9% slope) during 1995 and 1996. Objectives of this study were to (i) examine the variability of available N and corn (Zea mays L.) grain yield at different landscape positions of FOG-amended fields and (ii) determine whether N fertilizer management could be improved by considering the spatial variability of soil NO₃–N at different landscape positions in FOG-amended fields. A spatial and temporal variability in soil NO₃–N was observed during both years. Corn grain yields at all N fertilizer application rates were affected by slope position and followed the pattern: lower > upper middle. Nitrogen fertilizer requirements for corn production in conjunction with FOG management were also affected by slope position. Essentially no additional fertilizer N was required for corn production at the lower landscape position. It was estimated that site-specific fertilizer N management on FOG-amended fields could result in an average savings of 51 and 63 kg N ha^–1 (with a potential economical savings of US$42 and US$52 ha^–1) during 1995 and 1996, respectively.

Abbreviations: FOG, oily food waste • MERN, maximum economic rate of nitrogen • MEY, maximum economic yield • PPNT, pre-plant time of sampling • PSNT, pre-sidedress time of sampling

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