In a large bowl, combine the first five ingredients. Add oil, eggs, asparagus, pineapple, orange zest and vanilla; mix well. Fold in pecans. Pour into a greased and floured 10-in. fluted tube pan. Bake at 350° for 1 hour or until a toothpick inserted in the center comes out clean. Cool for 10 minutes; remove from pan to a wire rack to cool completely.