I need to know how to get sticker burrs out of pasture land with out hurting the tifton grass. I know they make the pre emergent stuff but that just does not seem cost effecient for us. We have approximately 1 acre with electric fence where we are trying to establish the tifton. Seems that the only thing that is thriving are the sticker burrs. Is there an economical way of ridding the land of the stickers? please help! Thanks