some kind of Folic acid like diamond nectar or something. idk what your skill level is but if u can read your plants real well the id suggest going with some floralicious plus or bloombastic (expensive), ive done side by side grows with each and saw enough difference to be worth it, $80 for Bloombastic. u need to tinker with each one, Floralicious works better on certain strains than Bloombastic. and some do better with something different. one thing i dont go without anymore is Great White, its a live microbial blend with many types of trychoderma etc. apply it every few weeks it will not only keep the root zone happy and healthy but it will drastically cut back your need for N during transition especially, setting up some tight nodes (if u want u can read a more detailed scientific explanation of why this helps on my journal). also, especially if u use microbes, supplement the carbohydrates with something like sweet (what i use) or black strap molasses, anything with simple sugars. as mentioned above some Superthrive is great as well, particularly during veg. if you don't want to shell out the money for those PK boosters i mentioned earlier, u cant go wrong with the Humboldt line of PK boosters. ive used those for years, i have grown fond of the Crystal Burst also have great luck with Snow Storm Ultra, all of them really, but for me the Bloombastic is better.
