i would say defintitely have to spray it, we've grown some pretty nice weed crops are first year. we have about five acres we put in corn and beans. works pretty well but the deer eat it all by late season. we use a fourwheeler with a sprayer on it to put the weed spray on, and use a hand broadcast seeder to put down the nitrogen pellets. i dont know if you have a fourwheeler or not, but if you do a sprayer for one with a boom works pretty well and you should have no problems with it the rest of your life. we usually put on two coats of weed spray when the corn first comes up then when it is about a foot tall. if you use roundup corn it will turn up really nice. if you get too many weeds it will choke out your food plot and the ears of corn wont be very big, that is what happened to us the first year. and when farmers no till they still have to spray for weeds. so i dont know if this helps but i would say definitely spray for weeds, and put down some nitrogen. seems on our place the amount of does that are there increased dramatically, and every night ten or so does would come to the field and draw in the bucks during the rut, good luck!!!!