The story is, I am applying compost as my fertilizer throughout the year. I am blending it with various things to get a better turf response out of it. Last Friday I had some locked gates and had extra. It sat over the weekend, and by the time I got to it Monday it had ammoniated some of the urea. It smelt like ammonia, not too strong, but it was there. It was about 37% moist. It was grade "A" certified yard waste compost that I had purchased. Plenty mature. Test results were 1.2%N - .5%P - .7%K. At my application rate (25 lbs dry weight per 1,000) that is only .3 lbs N per K. I blended in 1.5 lbs urea per 25 lbs dry weight which brought me to 1.02 lbs N per 1,000 sqft. I am not concerned about my compost blends being too hot to apply as I know exactly what I am putting down, and exactly the rate at which I am applying it. I was just wondering if anyone has seen an ammoniated media that was surface applied, like my compost, harm a lawn (or the biology in the soil). So far neither seems to be a problem. Another thing I am watching is N response. I am curious just how much N I lost from it escaping as Ammonia gas during, and shortly after, application. The organic matter and moisture in the compost should hold on to some/most of it, I would think. My blend is always mixed the day of, or day before, the application. Again, by the time I could use this stuff the urea had already started to be mineralized. I was curious if I would get a faster response because of this 'head start' so I tested it on a plot. So far there is no difference between the ammoniated compost and the urea compost areas. Time and observation will tell me how safe and effective I am when using slightly old blends like this. So far so good. I am also considering applying the compost and then applying the urea (or the other way around). It seems I would loose more N to the atmosphere this way though, and my applications wouldn't be as effective. Not to mention the time spent in the field double applying it. So what are your thoughts and experiences? Ever seen damage where .7 lbs of soluble N was ammoiated before a surface application and damaged the lawn? What concentration of ammonia is known to cause harm to turf (KBG, sometimes fescue)? Which application method do you think would minimize volatilizing (pre-mixing or double applying)? Everything can always be improved. One process potentially leads to 3 other possibilities. Gotta love Kaizen and the questions it brings. What are your thoughts? Thanks in advance!