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Too much Mag? Necrosis between veins
- Thread starter LostTribe
- Start date
If you're growing in peat and perlite that's hydro. It's just more water-retaining, acidic, and messy than other mediums. It wasn't easy to flush excess salt and low pH from it, which led me to say what I said before. It was a problem with promix+perlite and PBP to control pH and ppm without attracting fungus gnats, because I'd prefer to dry it out. If you're wanting to add calcium and magnesium the first place to look is probably in your tap water. It isn't a problem to water with plain if you have excess nutes and low pH but ideally you want to flush with your nute solution, and have enough perlite that this isn't a problem. Check the runoff pH and ppm with that. I liked 5.6-5.8 and 600-700 ppm for established plants but it was very easy to get too acid and too salty at that rate without a lot of runoff, in 3 gallon bags. 5.8 and 500 has more wiggle room for nutes that turn the medium acid as part of the plant metabolism, but it all depends, so there isn't a single answer.
Fixer
Active member
Hello G,O.Joe, Why isn't it a problem to water with plain water if you have excess nutes and low PH? Does low PH keep the the coco buffered? I've just switched to coco and already had to flush it.
Sorry for hijacking your thread LostTribe!
You wouldn't fertilize a lawn or garden with every watering, yes? You realize I'm not talking about flushing plants with water? It's not the ideal plan but it's better than not paying attention to salt buildup and pH, which is why it's often mentioned in feeding schedules.
I do have ~15% worm castings in these cups. I was going to up pot into Promix all purpose.
What Ph should I be watering at in the promix then? My mentor 20 years ago never ph'd nutes in Promix HP.
GO is on the right track here. Peat out of the bag has a lower pH. You did right by adding a buffer to begin with. However, your Mg is now dominating sites. It was available before the Ca. And peat has a higher capacity than an ordinary soil and will continue to make new sites available as it ages and breaks down. But Mg will always make it there before the calcium in a hydrated state.
My guess is that the Mg is keeping K and Ca in check- not to the extent that it's not fixable by the look of your picture. Also your run-off pH may appear within normal ranges because of the buffering effect, but the plant won't enjoy it as we would hope. Water with a pH between ~6.3 and ~6.9 and find a source of Ca that does not include Mg. If you need Mg, apply with epsom or other source foliarly (is that a word?) at a rate of ~50-80 ppm.
My guess is that the Mg is keeping K and Ca in check- not to the extent that it's not fixable by the look of your picture. Also your run-off pH may appear within normal ranges because of the buffering effect, but the plant won't enjoy it as we would hope. Water with a pH between ~6.3 and ~6.9 and find a source of Ca that does not include Mg. If you need Mg, apply with epsom or other source foliarly (is that a word?) at a rate of ~50-80 ppm.
So is the problem that I am using calmag and RO? Would diluting my tap (350ppm) down with RO and excluding calmag suffice? How much Mag is in hard tap water?
I read a little a long time ago about folks using cal nit instead of cal mag as some were having issues with the mag.
additionally, water this mix with same ph as I would in hydro? ~5.7-6.2
I read a little a long time ago about folks using cal nit instead of cal mag as some were having issues with the mag.
additionally, water this mix with same ph as I would in hydro? ~5.7-6.2
I can't say. I haven't seen any analysis of your tap water. Those values will differ from source to source.
Calcium nitrate, calcium phosphate, (to a lesser extent) calcium sulfate can help you right now. Or biomin calcium powder. I think you've got enough Mg for a little while. Whatever source you feel comfortable with and can research on your own.
I'd raise that pH number a bit. ~6.3 at a minimum. And make sure you're generating run off.
Calcium nitrate, calcium phosphate, (to a lesser extent) calcium sulfate can help you right now. Or biomin calcium powder. I think you've got enough Mg for a little while. Whatever source you feel comfortable with and can research on your own.
I'd raise that pH number a bit. ~6.3 at a minimum. And make sure you're generating run off.
shishkaboy
>>>>Beanie Man<<<<
Pics under the lights?
no its not .,too high in cal killing mag ,,change water job done
1-1.5 grams calcinit per gallon.
I would probably say the same for cal-phos. Nebulous differences.
I personally think the Mg is the problem. If I end up being wrong, my apologies. I think if you give a boat load of calcium a chance, other micros and Mg will find a better balance for you upon its back.
I would probably say the same for cal-phos. Nebulous differences.
I personally think the Mg is the problem. If I end up being wrong, my apologies. I think if you give a boat load of calcium a chance, other micros and Mg will find a better balance for you upon its back.
I am leaning Mg as the issue too. Hope the Calnit gets here quick the seedlings I started last week are looking bad. I don't think I should have added the dolomite lime either.
I am considering just taking cuts and starting over if the cal nit doesn't do the trick. But hoping it will fix them up.
Last 2 hydro runs about the same time in veg they started to do the same thing and I thought it was low Mg so I sprayed w epsom daily for a week then 2 weeks had gone by and they were toast. I flushed w RO for 24 hours and then fed less on everything and they eventually perked up and the harvest came through as normal. Was feeding 5ml/g w RO and went back to like 3ml/g if I remember correctly.
I rechecked my tap and its 250ppm@700scale. Forgot to check ec I will tomorrow. Calnit should be here as early as Wednesday.
My seedlings are now showing Potassium deficiency in the same peat mix. Still waiting on Cal Nit to arrive. Feed yesterday
RO
225ppm Calmg
LK, SilicaBlast, and then brought up to 650ppm with PBP grow. Ph 6.0.
Everything looks the same. Mg is continuing up the older mom's and seedlings are showing a great deal of Potassium deficiency. I think I really need to transplant everything and may put them in coco and see I can get them back on track otherwise the cloner is coming out and I will start over.
Keep having issues in veg. Haven't had problems like this at all in bloom...
RO
225ppm Calmg
LK, SilicaBlast, and then brought up to 650ppm with PBP grow. Ph 6.0.
Everything looks the same. Mg is continuing up the older mom's and seedlings are showing a great deal of Potassium deficiency. I think I really need to transplant everything and may put them in coco and see I can get them back on track otherwise the cloner is coming out and I will start over.
Keep having issues in veg. Haven't had problems like this at all in bloom...
You are adding way too much calmg and potassium with the silica blast,lay off the additives a bit till they get healthy. As i said before , Mix your RO and tap water up to 100-150ppm and then add PBP grow up to 500 ppm ph 6 and water with that till they get healthy. You may even want to water to quite a bit of runoff to wash out excess salts. check you runoff ec/ph.
Oh F'me. Potassium Silicate!!!! This soil/soiless biz is harder for me than hydroponics. I guess I have to unlearn that but not unlearn it completely.
My Cal Nit just arrived last night so would it be better to use that at 100-150 for a starter or go with mixing the RO and tap?
Roger that. I will report back next week.
Thanks so much everyone!
LT
shishkaboy
>>>>Beanie Man<<<<
Have u made any lighting changes recently?
