I'm Thinking Mag Def.

Gotta few plants growing. They're 10 days old from seed growing nicely, although the smallest one is showing small yellowing/browning areas on it's lower leaves. I haven't given the plants any nutrients yet, and they're grown in pro-mix soil. ph between 6.8 & 7.0.

Any photo pros out there that could let me know for sure if this is a mag def?

I'm getting some blood meal ASAP to give them some extra N (im thinking that may be a possibility as well) and if they need mag i'll give em some epsom salt.

first 2 pics are the sick plant, 2nd pic is one of the healthy plants, and the 3rd is what happens when you unknowingly let a curious cat into your grospace.

it'll be fine as long as its not spreading , just let it grow out . id start them on nutes soon , very week only every 2nd watering,

it is spreading. i just noticed it on one of my other healthy plants. has to be a nutrient issue. anybody else with some feedback?

your pH is a little high that could be locking out the Mg from the plants.

I'm thinking more a lack of calcium. .

stumps said:

I'm thinking more a lack of calcium. .

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Wow, I think you're right man. haha...
for some reason i didn't see it in the deficiency thread

i'm gonna check into it now.

what do you suggest for the time being?

Calcium (Ca) -Macro Nutrient and an Immobile element.

Calcium is another important element that helps the plants cell walls, cell division in making the plants stems, stalks, branches stronger, as well as contributing to root growth, mostly the newer root hairs, Calcium also helps enhancing the uptake of K in the the plants roots. Calcium moves really slow within the plant and tends to concentrate in roots and older growth.



When plants exhibit a Calcium deficiency the younger leaves are the first to show it as well as older leaves. The Leaf tips will die back, the tips may curl, and growth of the plant is stunted. The plant can show a weakness in the stems and branches, as well as a under developed root system that can lead to bacteria problems with roots dieing off. Having slow plant transpiration rates can aggravate the uptake of calcium. Make sure your soil isn’t very acidic, for calcium gets harder to be absorbed through acidic soils, Which leads to having a plant that is deficient in Calcium. The leaf tips, edges and new growth will or may turn a yellow/brown color that happen in spots and often surrounded by a sharp brown outlined edge and then the leaf tips die back. If too much calcium is given at an early stage of growth it can stunt the growth of your plants. Having to much of calcium will also flocculate when a concentrated form is combined with potassium. The parts affected by a calcium deficiency are the roots. Stem or petiole, young or old leaves.

Too much Calcium will lead to other micronutrient deficiencies. Calcium fixation is caused by many types of mediums such as: clay soils, unbuffered coco and humus. The lime tends to bond to these soils very easily. The stems of the plant will not be able to hold the plant up and will exhibit a white brown in between the veins of the leaves when having too much calcium. Also having to much potassium and or nitrogen will cause a calcium lockout.



Problems with Calcium being locked out by PH troubles

Very acidic soils with excessive potassium, dry and or wet soil. Lack of calcium in the soil may cause too acidic soil. This may cause to Mg or Iron deficiency or very slow stunted growth


Soil


Calcium gets locked out of soil growing at ph levels of 2.0- 6.4
Calcium is absorbed best in soil at a ph level of 6.5-9.1 (Wouldn’t recommend having a ph of over 7.0 in soil) anything out of the ranges listed will contribute to a
Calcium Deficiency.
Hope that helps.

so more than likely it's a ph problem?

i'll test my ph real quick.

I don't know there kind of young. have you given them any nutes yet? you might try giving a little. I try to keep the ph 6.2-6.8

stumps said:

I don't know there kind of young. have you given them any nutes yet? you might try giving a little. I try to keep the ph 6.2-6.8

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No i havent given them anything yet. gonna get some guano tomorrow...nitrogen



and the ph test came out acidic so i have to get it back up around 7

I would think about a all round veg nute. At 1/4 mix. 5-5-10 or something. But that's just me.

stumps said:

I would think about a all round veg nute. At 1/4 mix. 5-5-10 or something. But that's just me.

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i'm trying to stay organic, would blood meal help? molasses?

u can get allround veg Organic liquid nutes ....

this alaska fish fert. says sutable for oranic gardening. and I said the numbers wrong 10-5-5 is what I ment to say the alaska fish fret is 5-1-1.

i went to the local shop and they had 5-1-1 fish emulsion, but i decided to pick up 12-0-0 blood meal and molasses instead. i tested for potash and it had a decent amount...and the molasses is supposed to add potassium, so i went with that. we'll see what happens and thanks for the help.

...well i know its not a lack of postin the same thread more than once.

Philouza said:

...well i know its not a lack of postin the same thread more than once.

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I posted it in the plant problems and had no answers for 2 days, so I proceeded to post it in the general forum as well. If more people were like these guys and not like you, then that wouldn't have happened.

As for an update...

The spots grew considerably bigger on the lowest leaves and continued on to the middle leaf set now. I stabilized the PH of my water to 6.5, it was 7.5. also last water I gave them some lime, blood meal & molasses. very light though. time will tell.

on the other hand there is new growth...actually the growth never stopped. hopefully these leaves will turn back now that the ph is stable.

FYI. The ones that have spots will keep them. That's no big deal so long as you stop it from new ones.

egh...that's not good. the spots are now on the bottom and middle leaves...hopefully this stops or the entire plant will soon be covered in it.

flushed with ph'd, unchlorinated water and foliar fed with 1/2 a teaspoon epsom salt to a qrt of water.


hopefully they'll get growing.