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To Serve Man..... pH problems can & do occur even in soil grows. pH problems cause nute/mineral lockout, even when plenty of the needed nute / mineral is present. Get a cheap soil pH tester and know where you stand before you start adding things to drive pH up or down. Which could just cause more problems.
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If pH is not the issue (in between 6 and 6.8), Earth Juice Micro Blast is good, so is Cal-Mag or Mag-i-cal (use these as per their labels). Or seaweed extract (used at 1/2 the recommended strength).
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Both the Cal-Mag & Mag-i-cal take care of 90 percent of the problems experienced in flowering (low mag, cal and/or iron).
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Just know where you stand pH wise before doing other things. Also throw up some pics and we can help you dail your plants back in better.....
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Hope this helps.....
Keep it Real...Organic.....
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Psss... If you noticed.... I prefer Mag-i-Cal.....by Technaflora......
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I add vinegar to the food mix, not directly to the soil. Adding a little, and pH up a little with dolomite is usually something I have to do.

We had a plant that didn't look so hot, either. We thought it was probably a pH lockout problem along with Mg/Mn (cant remember which ), so after we let the soil get good and dry we changed the next feeding. This what the plant got...
- dechlorinated water
- ewc
- molasses
- miracle grow 8-0-0 organic
- epsom salts
- pH'd to "7-7.5" with a cheap pH probe from a garden center using vinegar and dolomite to pH.

pH 7-7.5 was chosen because of the acid rain locally.

Thanks for the help everyone. Is Cal-Mag all organic? I have a new ph tester coming in the mail right now, my last one broke (should be getting it by thursday), but my plant is fading fast, AND my WW is showing signs of the same. I'm almost 99% sure its mangenese and from a ph lockout (To be honest, I haven't checked the ph once since I started this grow...). What do you guys think? This came on real fast too. The first pics are of my really bad plant and this is only from a week or so of showing. The last ones are of WW starting to show signs. I know I didn't nip this problem in the "bud" (har har) sooner than I should of, but I'm in the shit now. Just hoping that they don't die on us!

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if cal-mag is not i believe the products i told you from before Calplex/Fulvex are both natural sources of calcium and magnesium

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http://www.rollitup.org/grow-journal...grow-evar.html

Liquid seaweed has non organtic preservitevs in it.

it kills the microbes.

I don't know how true that is. Maxicrop's Liquid Seaweed is all organic, I thought. I'm looking at Organicare's Fulvex right now. It looks like some really good stuff.

I just got my ph tester in the mail. I will test the soil ph later tonight when I get some distilled water. They are still going down though, I gotta do something QUICK.

Alright, just checked them all. The ph of the bad def plant is a cringing 7.99-8.01! The WW isn't far behind with about 7.78. How do I lower the soil ph before it kills my plants

Raising soil pH : (to make it more alkaline)
It is generally easier to make soil mixes more alkaline than it is to make them more acidic. The addition of dolomite lime, hardwood ash, bone meal, crushed marble, or crushed oyster shells will help to raise the soil pH.

by MisterIto
In soil: add dolomite limestone to the soil; use small amounts of hydrated lime.

Raising hydroponic pH : (to make it more alkaline)

In hydroponics: use potassium silicate, provides silicon at an effective doseage.
In bioponics/hydro-organics: add small amounts of sodium bicarbonate or lime.

Lowering soil pH : (to make it more acidic)
If your soil needs to be more acidic, sawdust, composted leaves, wood chips, cottonseed meal, leaf mold and especially peat moss, will lower the soil pH.

by MisterIto
bloodmeal/cottonseed meal during vegetative; bonemeal during flowering.

Lowering hydroponic pH : (to make it more acidic)

In hydroponics: use nitric acid during vegetative; phosphoric acid during flowering.

Contributed by: Spiritual.Fa
23-08-2003

Stabilizing pH with Dolomite lime

The best way to stable PH is by adding 1 ounce of Dolomite Lime per 1 gallon of planting soil.

Hey thanks. Would I just put the peat moss on top of the soil and water? How fast will that work? Thanks for the info. +rep