Quote Originally Posted by rhizome
Really surprised to hear about an Mg def, esp w/ source water that hard- how's yer pH?

Lose the superthrive.

whoa whoa whoa, rewind that.

MG deficiencies (in MY experience) appear DUE TO HARD WATER!!

why?

well,the water is usually 'hard' due to excess minerals, one of those being CALCIUM.

now, MJ doesn't like too much calcium. give MJ too much calcium and WHAT HAPPENS....CALCIUM LOCKS OUT THE MAGNESIUM!!

so, if you are using HARD WATER and NOT giving an epsom salt treatment, then you are MOST LIKELY experiencing a MAGNESIUM deficiency!!

believe me, I have experienced this problem in ALL of my grows (hard water can be a BITCH!!) so a MG deficiency is EASY to spot if you know what to look for.

got pictures?

A MAGNESIUM def. will result in COMPACTED "STUCK" GROWING TIPS THAT RESULT IN SLOW GROWTH.

Your fan leaves will start to yellow around the EDGES of the fan leaves. (It looks NOTHING like a N deficiency, if you are familiar with an N def....)

So, I would start with a good FOLIAR FEED OF MG (get some epsom salt, in your local pharmacy section...).

Get some DISTILLED WATER and add epsom salt until your ppm is about 150-200ppm. Spray your plants until they are nice and soaking (DO NOT SPRAY WHILE HID LIGHTS ARE ON!!!!! it's okay to spray while flouros are on).

spray every other day until you get your nice green foliage back. you could probably add some epsom salt to your res, but I don't know enough about hydro to advise such an action.
jEthereal Reviewed by jEthereal on . DWC Using Advanced A + B Sensi bloom.... I am using Advanced Sensi bloom A + B and am in the second week of flowering. I have picked up what looks like a mag def, but it's greening back up from some cal-mag. Now here's my question. I am only using the bloom A + B and superthrive. Does anybody know from experience if this is good to use without using the rest of the line. I plan to use Big Bud and Overdrive at the end. If Anyone knows where my ppm should be please let me know. Any Advanced Nutes Advice would be helpful. Rating: 5