End of last season I told all my customers, that have me apply fertilizer, that I'm ONLY going to offer products that contain organic matter to breakdown thatch and are beneficial to soil microbe activity. This is the product I started using: http://www.therichlawncompany.com/products/fertilizers/pro-rich-turf-food/ One of my mowing clients said one of the chicken manure products she used in the past encouraged mushrooms in her lawn. Any validity to this claim? At this point I'm not interested or set up for compost tea since my customer will think WT...? I need to ease them into healthier lawn care gradually. Any suggestions on other products to use that can be cranked out in a rotary spreader reliably?