cal mag issues

[wonderful]

hello, i have 5 aurora indaca plants 2 weeks old that all show cal mag deficiency signs. i recycled my soil and added 2 tbs powdered lime per gallon of used soil. i also have 2 extreemas only a couple days behind and they do not show the signs. i added more lime to my recycling soil to account for the ewc and perlite that i added to the old soil.
it is early enough in veg that i can still do a lot to fix this before flowering but i dont wanna go buy anything if dont need to.
the soil is 7 weeks of sitting, it was at 5 weeeks of sitting before planting seeds.

 

[RanchoDeluxe]

Two week old seedlings really don't need a whole lot of food man. Your soil mix or environment must be off. Adding more than 2tbs of lime to your mix per gal. is a big mistake.

 

[SeaMaiden]

Wonderful, can you tell us what it is you're interpreting as a 'cal mag deficiency'? If you start more simply, just give us your observations, it may be easier to figure out what's up. I agree with RD, it seems awfully early for 2wo seedlings to be showing signs of an immobile element deficiency (Ca-).

 

[Neo 420]

What did you put in the initial mix? Pics would help too!!

 

[wonderful]

the issue is the edges of the leaves are fadded green and there are lighter green spots too. i dont have any pics right now, will take some when i can. i had a similar problem last round, but it seems to be just the aurora indica its affecting.
when i recycled my soil, i had 20 gallons to start with. i added 2 cups of each of the following cups
alfalfa meal
bone meal
kelp meal
powdered dolomite lime
jersey Greensand
then i added 30or 50 pounds of ewc (5 gallons)
then i added a miniscule amount of guano about 1.5 to 2 cups
then i added enough perlite to get the right consistancty about 10 to 14 gallons

with the addition of the perlite considered and after the discovery of the problem, is when i added 1 cup of lime additionally to the soil.

 

[wonderful]

one more thing, it is more noticible on the top leaves than the the older sets

 

[wonderful]

the runoff ph was 7.6 where the starting water ph is 7.4

 

[Scrappy4]

My best guess is the added lime is the culprit. What you think is a deficiency is probably a lockout due to lime. You might want to either repot in good soil or feed with low ph feeds. Good compost and or ewc could be helpful as well.....best of luck......scrappy

 

[jerry111165]

then i added 30or 50 pounds of ewc (5 gallons)

5 gallons of castings shouldn't be anywhere near that weight. I wonder if its holding too much water...

What is the original mix, and did you have the same problem with the original mix?

J

 

[RanchoDeluxe]

I know this may be frowned upon. But dirty looks over the internet don't pay the bills.

I would start them off in a bag of Roots or FFOF cut down with some peat or coco.

Perhaps your soil is too hot. Did your plants start to yellow at the end of your last crop?

I've been a dolomite lime user for years (hundreds of lbs) but after reading the Living Organic Soil sticky (first 30 pages) I've changed my tune.

In fact, that sticky has rocked my world. If you want an explanation of how pH, CEC, and why dolomite isn't really where its at, not to mention some great soil mix recipes ...check it out.

 

[wonderful]

this is around 3 weeks,

 

[OrganicBuds]

did you let the soil cook? With all those additives you have to let the soil cook or it will cook your roots.

 

[negative37dBA]

the runoff ph was 7.6 where the starting water ph is 7.4

Is this not to high for PH.
In soil, I run 6.30 ph when I water and I beleive it is even less in hydro, correct? Like 5.6 or so. So anything above 7 seems high to me. Am I missing something?

 

[SeaMaiden]

Hydroponic cultivation requires a much lower pH range than soil cultivation, negative. For hydroton/expanded clay balls, if I recall it needs to be in the low-to-mid 5 range, so over 7 is extremely high. Coco coir cultivation and soilless media seem to allow for ranging up into the low 6 range, but still, nothing close to soil. Soil should be in the 6.2-6.8 range, rather below 7.

Wonderful, what are the clay balls doing there? Is this plant in Hydroton, or soil? Media makes a difference.

I see what you're talking about, and the plant is so small that it's a little confusing to see any issues at this point. Are those lower leaves that are affected there? If so, I'm going to suggest Mg, but would need to see the progression to have any more certainty.

Mg- is easily corrected by giving a foliar feed of MgSO4 at the rate of 1/4tsp/gal (use a surfactant/sticker-spreader).

 

[headband 707]

Hydroponic cultivation requires a much lower pH range than soil cultivation, negative. For hydroton/expanded clay balls, if I recall it needs to be in the low-to-mid 5 range, so over 7 is extremely high. Coco coir cultivation and soilless media seem to allow for ranging up into the low 6 range, but still, nothing close to soil. Soil should be in the 6.2-6.8 range, rather below 7.

Wonderful, what are the clay balls doing there? Is this plant in Hydroton, or soil? Media makes a difference.

I see what you're talking about, and the plant is so small that it's a little confusing to see any issues at this point. Are those lower leaves that are affected there? If so, I'm going to suggest Mg, but would need to see the progression to have any more certainty.

Mg- is easily corrected by giving a foliar feed of MgSO4 at the rate of 1/4tsp/gal (use a surfactant/sticker-spreader).

Humm thats interesting I didn't know this ,,so you don't have to go down to 5 for all mediums to get your iron in? .. I have done the other mediums but I prefer soil all the way lol.. headband 707

 

[SeaMaiden]

Hmmm... well, I've never liked the pH range charts that pop up on the stoner forums, there is no veracity to the charts as posted. I've also never had a problem that was related to Fe, except with my Camellia and a bucket of water + steel nails (non-galvanized) did the trick, so I keep some nails to get rusty, and threw a few under the Camellia.

Sorry, I don't think that was very helpful, was it?

 

[headband 707]

Hmmm... well, I've never liked the pH range charts that pop up on the stoner forums, there is no veracity to the charts as posted. I've also never had a problem that was related to Fe, except with my Camellia and a bucket of water + steel nails (non-galvanized) did the trick, so I keep some nails to get rusty, and threw a few under the Camellia.

Sorry, I don't think that was very helpful, was it?

LOL okay sorry this took me so long to get back to this thread but I have been thinking about it lol..
As far as using Nail to rust for iron /Fe is this what you are doing?
I do not think I would do this and this is why..
These nails for the most part come from China so I would have to assume they are not pure.In other words there could be impurities in there you are not aware of i.e.lead ,mercury and who knows what else as far as scrap metals. So for these reasons I would not use nails I would get the chelated iron from the shop but that is just me stay safe headband 707

 

[SeaMaiden]

LOL okay sorry this took me so long to get back to this thread but I have been thinking about it lol..
As far as using Nail to rust for iron /Fe is this what you are doing?
I do not think I would do this and this is why..
These nails for the most part come from China so I would have to assume they are not pure.In other words there could be impurities in there you are not aware of i.e.lead ,mercury and who knows what else as far as scrap metals. So for these reasons I would not use nails I would get the chelated iron from the shop but that is just me stay safe headband 707

Absolutely a good consideration. However, for *me* I don't think it's ultimately all that important and it's to do with the fact that I live in a place that's been mined (gold country) for many years for many things, not just gold. You should read some of the well reports we get, they include high (natural) levels of stuff like lead and arsenic.

It all has to come from somewhere, doesn't it? I learned only a couple of years ago that we have to be careful of radon. I was surprised, but apparently it's a result of the large granite plutons that comprise a good portion of the Sierra, along with the uplift (the Sierra are growing not because of tectonic plate activity, but because the granite plutons are literally floating over the top of heavier rock formations) bringing all kinds of mineral goodies to the surface.

I didn't think the nail in a bucket thing would work well, so I did it on my Camellia and damn if it didn't work. I've never had to correct a Fe- in cannabis, only the rhodies and Camellia.

 

[FunTimesIndeed]

The raw chemicals that make up most of what can be found on the shelves of the hydro shop came from China to.