I will do just that in my back yard... there will be three test plots... #1 will be straight compost #2 will be compost and manure #3 will be straight manure... Kiril, as far as manure... is this composted or are you referencing manure from a local farm? If from a local farm I see weed seeds becoming an issue... if it is composted... then the N won't really be there. I have my "Cobbpost" as Tree affectionately called it which is a Class A Biosludge. That is what I burnt the previous lawn with... I have used it twice, the first time was fine, no burning, lawn is great, the second was much more fresh causing the lawn to be burnt and what not... would you consider replacing the manure with the cobbpost?