jbrockey, You may want to find out what fert was put on as is common to fertilize hay (alfalfa) with straight potash 0-0-60 or 0-14-42 or similar.Often Boron is used in these mixes which you would know in a hurry if boron gets in the water. In my 25 years in Ag I never had a problem with "hay" fertilizer" moving Usually a low to no "N" is used as alfalfa fixes its own "N"and phosphorus is for the most part immobile so will attatch to the clay in the field which is the reason it is used little in hay production (it wont move to the root system) Alfalfa roots are often several feet deep.If it was a grass mix stand still very little "N" was probably used so you may not experience the problem you are preparing for. Just my .02Cents, Hope it works out !! Ted
