Preheat oven to 350 degrees F (175 degrees C). Lightly grease an 8x4 inch loaf pan.
In a mixing bowl, beat together butter, 1 cup sugar, juice and eggs. Combine flour, baking powder and salt; stir into egg mixture alternately with milk. Fold in lemon zest, nuts, and blueberries. Pour batter into prepared pan.
Bake in preheated oven for 60 to 70 minutes, until a toothpick inserted into center of the loaf comes out clean. Cool bread in pan for 10 minutes. Meanwhile, combine lemon juice and 1/4 cup sugar in a small bowl. Remove bread from pan and drizzle with glaze. Cool on a wire rack.