D A youve one your home work. Ive looked into chicken litter. Up your way is turkey farms an egg factories. One is by Thompson Iowa. Think about a silage feed truck . youve got a way to mix and haul and dispense into your ecolawn.. Also find a feed mill that has some corn that has gone bad. compost or bokashi it . 9% nitrogen, has a natural fungicide and has some natural herbicide. Is there any mushroom farms by red wing min. Mushroom compost is good ,the thing against is it is high in salt content.