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TECHNICAL REPORTS

Waste Management

Recycling Soil Nitrate Nitrogen by Amending Agricultural Lands with Oily Food Waste

^a Institute of Natural Resources and Environmental Sciences, NARC, Park Road 45500, Islamabad, Pakistan
^b University of Guelph, ON, Canada N1G 2W1

^* Corresponding author (trashid256{at}yahoo.com).

Received for publication August 30, 2002. With current agricultural practices the amounts of fertilizer N applied are frequently more than the amounts removed by the crop. Excessive N application may result in short-term accumulation of nitrate nitrogen (NO₃–N) in soil, which can easily be leached from the root zone and into the ground water. A management practice suggested for conserving accumulated NO₃–N is the application of oily food waste (FOG; fat + oil + greases) to agricultural soils. A two-year field study (1995–1996 and 1996–1997) was conducted at Elora Research Center (43°38' N, 80° W; 346 m above mean sea level), University of Guelph, Ontario, Canada to determine the effect of FOG application in fall and spring on soil NO₃–N contents and apparent N immobilization–mineralization of soil N in the 0- to 60-cm soil layer. The experiment was planned under a randomized complete block design with four replications. An unamended control and a reference treatment [winter wheat (Triticum aestivum L.) cover crop] were included in the experiment to compare the effects of fall and spring treatment of oily food waste on soil NO₃–N contents and apparent N immobilization–mineralization. Oily food waste application at 10 Mg ha^-1 in the fall decreased soil NO₃–N by immobilization and conserved 47 to 56 kg NO₃–N ha^-1, which would otherwise be subject to leaching. Nitrogen immobilized due to FOG application in the fall was subsequently remineralized by the time of fertilizer N sidedress, whereas no net mineralization was observed in spring-amended plots at the same time.

Abbreviations: CC, unamended control • FFOG, fall-applied oily food waste • FOG, oily food waste (fat + oil + greases) • SFOG, spring-applied oily food waste • WWC, winter wheat cover crop incorporated in spring

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