The 1991 Census of Agriculture was conducted on June 4, 1991 . Census farm is defined in 1991 Census of Agriculture as any person operating an agricultural holding which produces at least one of the following products intended for sale: crops, livestock, poultry, animal products, greenhouse products, nursery products, mushroom, sod, honey, maple syrup products. All tabulated data are subject to confidentiality restrictions prior to release. Due to confidentiality constraints, data for those geographic areas with very few agricultural operations are not released separately, but rather merged with a geographically adjacent area.