what dyna gro, the grow or foliage pro? do you have pro-tekt? what were you feeding before? are you using ppm/ec or ml/gal to measure your nutes? do you ph anything? how often are you watering and how much?
The good thing about dyna gro is that it is a complete nutrient, meaning you don't absolutely have to have any additives and you will still get everything your girl needs.
A good way to start is at 1-2ml/gallon during veg, 2-5ml/gallon during flower.