Spidey, basically the only nutes i used during the entire grow that were successfully taken up without causing nute burn, was all my Fox Farm shit. I got the complete line now, from grow big to ChaChing, and i think its worth it. There is other shit you can use, like NowStopWhining recommends using Sensizym and Tarantula from Advanced Nutrients, and he swears by them, But you can also use those in accompanyment with the Fox Farm shit. N if u ask him about it, hell tell you that with FF nutes, its pretty easy to not burn your plants, you actually have to try to overfeed them on purpose if you wanna burn your plants as a matter of fact, lol. Just snatch up some Growbig(make sure it just says fertilizer, not hydroponic), Big Bloom n Tiger Bloom bottles. N then they have Solubles - just powdered additives that you can use at different times of your grow, all the way up to harvest, Open Sesame, Chaching, and Beastie Bloomz. I havent used the solubles yet, but im going to on my grow comin up here.
I can also hook u up with the FF feeding schedule that i got in my hydrofarm catalogue.
As far as watering goes, All i can really say is, use your finger, LOL. Basically i dont personally do that, i just water every 2 days. My soil is FF Ocean forest mix, n it holds moisture pretty well. I have a Ph, Moisture, and Light meter for soil - cost me 7 bucks, and whenever i stick it all the way to the bottom, and it reads dry, thats when i watered originally, but when i got into the swing of things, it basically was every other day anyways,so thats what ive been doing. Now the Amount, im not 100% sure either, i can only tell u what ive been doin. I have 3 gallon growbags. Ive only filled each one up with 2 gallons of soil, and ive folded down the top for a lip so i can grab on to the bags without them slippin. The amount of water/nutrient solution i give them is a half a gallon per plant. I dont know if thats underwatering them, but they seem to like it just fine. I give them water one feeding, and then the next feeding i give them my nutrient solution. and i use distilled water mostly, but when i cant wait to get the the store, tapwater works fine.
Everything is going smoothly now dude, and i promise you that it will for you aswell. I see that your gonna be using MG for one of your plants, n thats all well n good, but my personal experience with MG hasnt been one thats been very fun. It worked for the first 3 weeks of veg, and then when i went to give it nutes, i burned the plant. So i flushed it out, and tried some different nutes, and i burned it again, lol. So finally i transplanted into some different soil, i think it was hyponix potting soil, and i got some MG perlite, and i didnt use nutes at first n everything went fine. But then i went out cuz i thought i fixed the problem, and i got me some MG nutrients, and i fuckin burned them again!!! the problem with MG is, that the NPK ratio is too high, rather than shit being like 2-5-3, its 15-34-19, and that shit is just too much for the plants to take. So be careful with the MG - it can work out good for you as youve seen with buds for less, but it can also go the other way if your not careful.
If you can, just hit up your google, and look up hydroponics shops in (your city n state here) , and it should pop up any hydro shops around your area where you can get your hands onto some Fox Farm soil, FF nutes, Advanced nutrient nutes, and pretty much every other product that people talk abotu using on here. First time i went into mine was halfway through my grow, when i realized there was one 20 minutes away from my house, n i didnt wanna leave man. it was the shit, lol. I musta spend like 200 bucks that day, just gettin my shit properly fixed. they have it all.
But it sounds like your gonna have shit under control man, and i hope ive given enough of my 2 cents on nutes n watering for you to at least give u an idea of how i did mine, n mine is successful so far *fingers crossed*. Good luck with your grow brow, ill be here man if you need anythin
-K1.