What other costs must you consider before you decide to take the job? you've just been hired by the illinois athletic department to fertilize their field before winter. in order to determine how much money you're going to make on the job, you must first determine how much money it will cost you in materials. you must fertilize this football field with weed/feed. the dimensions of the field are 360 feet by 160 feet including the end zones. greenthumb weed & feed will cover 5000 square feet and costs $9.99 per bag.