Rusty leafs

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Ninjawitswag

Member
2 days ago I noticed a few small orange spots on my leafs today those few spots turned into the entire edge of my plants... I'm vegging under 200 watt of cfls kept 6 inches above plants, any ideas on what the rust is caused by and how can I fix it?
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N

Ninjawitswag

Member
macsnax said:
Looks like you need calcium, what kind of soil is that?
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I'm using a promix from my local hydroponics shop, I was told everyone in my area uses it so I never thought it would be soil, but I'm a first time grower so what do I know lol.
 
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macsnax

macsnax

Well-Known Member
Did you transplant recently? If that has been in that mix for 10 days and just starting to show brown spots, I would add a little calmag, start with 1/4 recommended dose.
 
N

Ninjawitswag

Member
macsnax said:
Did you transplant recently? If that has been in that mix for 10 days and just starting to show brown spots, I would add a little calmag, start with 1/4 recommended dose.
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Not I started the plants in those pots and will transplant next week or so.. what is this calmed would my hydroponics shop have it?
 
macsnax

macsnax

Well-Known Member
You might be better off waiting, and water with a bit of runoff. If the brown spots get worse then try some calmag. It looks like there's plenty of N in your mix calmag also has N in it.
 
Johnei

Johnei

Well-Known Member
Clean pH'd water for now, at least for the next 2 waterings and make sure you have a good amount of runoff and let them dry very well between waterings. Eventually when you do feed any nutrients again, cut the dosage in half from whatever you were doing before. You are overfeeding.

(nutrient antagonistic situation fooling into thinking needs some nutrient but it's an excess.)
 
N

Ninjawitswag

Member
Johnei said:
Clean pH'd water for now, at least for the next 2 waterings and make sure you have a good amount of runoff and let them dry very well between waterings. Eventually when you do feed any nutrients again, cut the dosage in half from whatever you were doing before. You are overfeeding.

(nutrient antagonistic situation fooling into thinking needs some nutrient but it's an
I haven't used any nutrients yet I was going to wait till day 15 I'm only on day 10 I only water once every 24 hrs
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N

Ninjawitswag

Member
macsnax said:
You might be better off waiting, and water with a bit of runoff. If the brown spots get worse then try some calmag. It looks like there's plenty of N in your mix calmag also has N in it.
Click to expand...
Okay thanks I'll look into calmeg in a couple days. Why would it only happen to 1 out of 12 plants
 
im4satori

im4satori

Well-Known Member
looking at it it looks over fertilized

the leaves are very dark green, but you say you've used zero fertilizer??
pro mix .. doesn't have nutes in it does it ...at least not enough to cause an issue

are you checking your ph?

if your sure you've not over fertilized id water with only

1/8 tsp Epsom salt and 1ml calmag per gallon for a couple waterings and check the ph
 
N

Ninjawitswag

Member
im4satori said:
looking at it it looks over fertilized

the leaves are very dark green, but you say you've used zero fertilizer??
pro mix .. doesn't have nutes in it does it ...at least not enough to cause an issue

are you checking your ph?

if your sure you've not over fertilized id water with only

1/8 tsp Epsom salt and 1ml calmag per gallon for a couple waterings and check the ph
Click to expand...
My promix has no nutes and haven't used nutes. Also haven't checked ph levels at all... I read online that usually water from a well is clean enough where you don't need ph test, I'm sure that sounds stupid but I couldn't afford the 20$ for a ph test kit at the time.. would you suggest pruning the leafs off before it spreads? They are on lower leafs anyways. Thanks for the help my hydroponics shop said use something called protector but it's 25$
 
Johnei

Johnei

Well-Known Member
Don't prune damaged leaves, because the problem still exists within and then other different leaves will show the problem. It'll just show up somewhere else. You have to pH your water properly when running in straight Promix. pH 6.3 works good. You also have to feed low nutrients because promix basically has nothing in it and after a few weeks even if you were pHing, no food, and you'll get problems.
 
Johnei

Johnei

Well-Known Member
Promix is peat based, and peat is very acidic, the small amount of pH buffering that is pre added to brand new Promix is not enough to last and be able to water without pHing very long. You must pH your watering. Your pH is being drivin down out of the range where marijuana can uptake nutrients. And, there's just no nutrients.
 
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