Broadcasting isn’t typically recommended for this kind of product due to the amount of nitrogen you’d be losing to volatilization into the air. Personally, I used to use my Jang seeder and fill the hopper with it paired with a seed wheel with massive holes in it so that I could “bury” the Actisol and put it right where the crop needs it without any losses. It worked remarkably well and was easier to meter how much the plants were getting. To calculate it, I would grab the nitrogen need for a particular crop (usually in lbs/acre), and I would convert my beds to an acre value (i.e. 1 bed = 0.003 acres) so I can figure out how much to apply per bed. I like this method better as I’m feeding the crops specifically, and not the crops and all the weeds that inevitably pop up and feed on it when you’re broadcasting.
If you’re still broadcasting anyway, check the application rate of the broadcaster and do a dry run with a known quantity (weight) of Actisol to calibrate it (since the rate differs based on the size/shape/weight of the fertilizer). Then apply as directed for the crop’s needs.
Hope this helps!