Im doing my first grow (soil) and I am using Humboldt's organic line. I was wondering if grow natural was a weak fertelizer since its labeled 3-1-3 or is that only a ratio and not a reading of strength, like would 9-3-9 be the exact same? Also I follow the schedule when I started to feed and some got burned while others didn't and the water was well mixed, soil and application the same. How can you tell when a plant is ready for ferts during the veg and flowering stages? thx for any responses 