Hello, I am an Ecological Restorationist and one of my clients has birdsfoot trefoil (BT) in their savanna. At a recent Commercial Pesticide Applicator workshop, a UMN Extension turf expert let us know that BT can be knocked back in a lawn by increasing the amount of nitrogen in the soil. Seems like this should also work in a native area like a savanna, but I would like to know the rate of nitrogen application that would be most effective. Can you tell me how much nitrogen I should apply to this savanna to control this BT? Thank you.