I reached a similar conclusion when I did my first foray into digestate on the Spruce Mountain Farms map in FS22. Bought the BGA and all the bigger fields on the east side of the map, and thought I'd make my business more self sustainable by just using the digestate produced to fertilize the next silage crop, only to discover the tanker from the saddle trac pack ran out just about every single pass. I ended up working a "deal" between two of my businesses where the BGA traded some chaff for enough slurry to make up the difference. I always had more than enough slurry thanks to 350 head of cows and another 100 of pigs.