Sensitivity analysis of Residual Soil Nitrogen (RSN) indicator in Canada. (3656)
Authors:
J.Y. Yang* - Agriculture and AgriFood Canada, Ottawa, ON R. De Jong - Agriculture and AgriFood Canada, Ottawa, ON C.F. Drury - Agriculture and AgriFood Canada, Harrow, ON T. Huffman - Agriculture and AgriFood Canada, Ottawa, ON X.M. Yang - Agriculture and AgriFood Canada, Harrow, ON
Abstract:
Two nitrogen indicators for environmental sustainability of agricultural systems have been developed using a Canadian Agricultural Nitrogen Budget (CANB) model based on agricultural census data and the Canadian Soil Information System (CanSIS). Residual Soil Nitrogen (RSN) is the nitrogen which remains in the soil profile at harvest in excess of crop requirements. The Indicator of Risk of Water Contamination by Nitrogen (IROWCN) links the RSN to climatic conditions to assess the likelihood of nitrogen moving out of the soil profile. Sensitivity analysis was carried out by changing selected inputs and parameters by 10% while keeping other parameters at their original value. When fertilizer N was increased by 10%, RSN increased by 7.5 %. Similarly a 10% increase in manure N increased the Canadian RSN level by 3.4 %. A 10% increase in poultry, cattle and hog numbers resulted in the RSN levels increasing by 1.3 %, 1.2 %, and 0.9 %, respectively. The impact of various crop management scenarios such as replacing a percentage of the corn acreage with soybeans or in the Prairies replacing some summer-fallow
acreage with wheat on RSN values will be discussed.
Speaker Information: Jingyi Yang, Agriculture and AgriFood Canada, Ottawa, ON, Room 4105, K.W. Neatby Building, 960 Carling Avenue, Ottawa, On K1A 0C6; Phone:
613 759 1412; E-mail: [email protected]
Session Information: Monday, November 1, 2004, 7:55 AM-3:00 PM Presentation Start: 12:45 PM
Keywords: nitrogen indicator; residual soil nitrogen; sensitivity analysis; water contamination
