can't figure out my deficiency...

Dboi87

Dboi87

Well-Known Member
20131011_180931.jpgI've been getting these little brown spots on my leaves. Once the spots show up they slowly turn yellow around the spots and eventually brown out and the leaf dies. Seems like only on older growth so I'm thinking it's a macro nutrient. However I can't find anything that looks like it. In happy frog soil. Ph is at 7. N-P-K is 24-8-16
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The small spots could be calcium deficiency and the larger blotches could be phosphorus deficiency. They often go hand in hand. Best of luck from Professor Snook
 
always garden lime the soil.Garden lime is 5 bucks a 40 lb bag. two teaspoons per gallon should do you well.
The next thing you should add would be azomite.About 40 bucks for a 40 lbs bag.Allot of hydro shops carry it or can get azomite.
Azomite is a mined mineral that has every known micro nute in it.Your plants with these will never fall out of ph..and Never have a micro nute deff. of any kind.
Even expensive soils do not have enough lime in them to balance Ph correctly .Allot of PH problems come from water..the waters ph might be correct before you pour it into your dirt.
But once the water sits in the soil or media it is poured into the PH can fluctuate and change depending on the water quality.
Most all of the deff you see in a plant are not actually deff. at all,but a ph lock out that makes it look like types of deff.
Between the azomite and garden lime it should solve your problems or at least narrow it down.To what it is NOT and then it will make it easier to figure out what it IS.
Ive heard raider talk about using happy frog with never a problem with PH.There however have been allot of people who are using fox farm on here that have apparent PH problems with their soil.
 
I believe there are only a couple of docs in the US that test for this. I didn't go to Michigan because the other one was closer to me.
 
max420thc said:
always garden lime the soil.Garden lime is 5 bucks a 40 lb bag. two teaspoons per gallon should do you well.
The next thing you should add would be azomite.About 40 bucks for a 40 lbs bag.Allot of hydro shops carry it or can get azomite.
Azomite is a mined mineral that has every known micro nute in it.Your plants with these will never fall out of ph..and Never have a micro nute deff. of any kind.
Even expensive soils do not have enough lime in them to balance Ph correctly .Allot of PH problems come from water..the waters ph might be correct before you pour it into your dirt.
But once the water sits in the soil or media it is poured into the PH can fluctuate and change depending on the water quality.
Most all of the deff you see in a plant are not actually deff. at all,but a ph lock out that makes it look like types of deff.
Between the azomite and garden lime it should solve your problems or at least narrow it down.To what it is NOT and then it will make it easier to figure out what it IS.
Ive heard raider talk about using happy frog with never a problem with PH.There however have been allot of people who are using fox farm on here that have apparent PH problems with their soil.
Click to expand...

I had never PHd before because I never had a problem with it. However this time I did and was told to test my run off water. My runoff tested at 7 on the dot. I bought hydrated lime but some people say not to us hydrated. Any input?
 
With a run off of 7 you have locked out your macro's. This generally happens with an imbalance or lack of air flow or both. Once they spot they will die. Get your ph down in the correct range, increase air flow, if that take removal of some leaves, do it. You have to be flexible and be able to change your practices as issues arise. Have you amended your soil? Personally I would lower your ph by feeding them 5.6 to 5.8 until your run off come down, if it does...Hydro is much easier to control and this is the reason many people change JAS
 
pulverized garden lime can be purchased at any home depot or mennards.These folks around here call it garden lime.If you ask for dolomite lime they will look at you clueless.
If you were pouring phed water in at 6 and the run off is at 7 that means the soil PH is higher than 7 in order to raise the waters ph that is running through it higher.Lowering the PH of the water will ajust this some.Adding lime to the flush will ensure it stays where it is supposed to be.
i have no understanding what hydrated lime is so i cant comment.I use garden lime and azomite when i grow in soil(almost never these days but in my veggie garden)A small hand full of azomite i will throw in my res every change out.
If we are adding stuff to our soil we might as well throw a pinch of epson salts in too.
The best soil you can get if you are a soil grower is soil you make and amend yourself.There is a great recipe over in organics under subcools super soil. It works like a champ for dirt growers.
If you are using fox farms or any other purchased in a bag soil add the garden lime and azomite at least to ensure a good healthy run with no problems.Many of these purchased bag soils work really well to grow marijuana.So long as you maintain the PH.
 
From here its really hard to say. There area couple of ways, drop you ph low when feeding, like 5.6-5.8, this takes time as you only water on regular intervals and its a slower process. Second is to flush with low ph again and read your run off until it comes down to within spec. Once you are close you can add a little lime which should stabilize things. PH swing in soil can be eliminated if a proper mix is done at the start. Being more hydro here I would suggest a conversation with one of these soil guys here...sub cool...uncle ben...they will be able to give you a better recipe then myself, now if you plan on going hydro next run...I will gladly walk you through the who's and why's Good Luck JAS
 
Sulfur or peat moss to drop the pH, kicker is the issue is not pH. It's always brought up when folks don't know what the problem is. Cannabis is very pH tolerant when it comes to nutritional uptake. 7.0 is excellent. Don't ever lime your soil except with dolomite lime which is available at Lowe's. Dolomite is fairly neutral as is gypsum but the latter contains no Mg and is pretty water soluble - doesn't last long. Quick aka hydrated lime is VERY alkaline.

The spots look like a reaction to too much salts. If I feel like pushing my plants with plant food I always use rainwater as the carrier. BTW, you got some input at the Riddle3m site on this issue.

How much of the 24-8-16 food and how often? Sounds like the Vigoro brand. Yes?
 
Its a water soluble 24-8-16. I use two teaspoons per gal but only 1/3 cup of this solution every other watering.
 
Uncle Ben said:
BTW, you got some input at the Riddle3m site on this issue.

How much of the 24-8-16 food and how often? Sounds like the Vigoro brand. Yes?
Click to expand...

Actually just MG all purpose until I get my gyna gro sent.
I was looking over my posts at RM3 and couldn't find where this issue was brought up. I know I posted on the clawing from my last grow.
 
Dboi87 said:
Its a water soluble 24-8-16. I use two teaspoons per gal but only 1/3 cup of this solution every other watering.
Click to expand...

Yeah, that isn't a lot. When I water or fertilizer I use a lot more to drench, like 1 - 2 quarts per 5 gallon pot, enough for a good runoff. I rarely go over 1 tsp/gal.
 
I hate going to this because as an experiment I once grew to plants all the way up to flower in 2 oz dixie cups and never had a problem, but do you think maybe being root bound is the problem?
 
Dboi87 said:
I hate going to this because as an experiment I once grew to plants all the way up to flower in 2 oz dixie cups and never had a problem, but do you think maybe being root bound is the problem?
Click to expand...

A root bound plant is not good.
 
Uncle Ben said:
A root bound plant is not good.
Click to expand...

Lol this I know. But is it the cause of the spots? At the end of the day the plant is disposable. Just bagseed. My main concern is figuring out the cause for future reference so I'm not just guessing at possible solutions. Ill repot again. It seemed to have at least slowed the problem before
 
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