4 foot piece of 3/16 by 1&1/2 inch angle aluminum welded to a 12 inch piece of 2 inch aluminum conduit. sharpen the business end with a file and your good to go , oh weld a little stop for the butt end in the tube.
Don't forget to paint your spikes fluorescent orange!
Three-fourths of the Earth's surface is water, and one-fourth is land. It is quite clear that the good Lord intended us to spend triple the amount of time fishing as taking care of the lawn.