Nute problem?

[topherfrog]

I have six plants and almost every one starts from the oldest growth with yellow leaves that start to get rusty spots on them. they slowley shrivel and die. Some I pinch off some I dont, just because they are the largest leaves.

I use miracle gro soil/fert and distilled water just so that I know i dont have to ph test. all three items are under 7 for sure.

Strain of Mj? bag seed
Hydroponic or soil? soil
From seed or clone? seed
Age of plant in question? 5 weeks
What stage (Veg/Flower; how many days into)? veg
Medium (Soil, Rockwool, Hydroton etc.)? soil miracle gro (come rich outdoor top soil)
Container/Pot size? 1 gal
Have they been transplanted, if so how long ago? not recently
If soil, composition ratios (peat moss, perilite, vermiculite etc.)? 25% perilite
Water runoff Ph? unknown
Nutrients added? miracle gro nursery select
Ratios of nutrients (N% P% K%)? 20-20-20
Feeding schedule? always because the distilled water lacks micros
When were they last fed/watered? every three four days
How are you determining when to feed/water (weight, wilting, etc.)? I check everything
TDS/EC/PPM?
Tap/RO/Distilled water? distilled
Ph before and after adding nutrients?na
Is your Ph equipment properly calibrated?na
Light intensity/Age of bulb/Wattage? 320cfl
Distance to the canopy? 1-5 inches over entire canopy
Temps at canopy? 60-80
Temps at root zone or reservoir?na
Day/Night temps (Min.-Max.)?24 hour light
Current air flow (CFM)? small fan blowing hot air away
Is there air blowing directly onto plant? no
Using CO2? no
Relative humidity? na
Growing technique (Scrog, Sog, Supercropping etc.)? na
Has plant recently been pruned, clones taken, fimmed or pinched? topped 2 weeks ago
Pests? na
Chemicals used to irradicate? na
If so,When? na

 

[Brother_Monk]

Without a Ph reference, it will be pretty hard to determine exactly what is going on with your plants. You need to get a Ph instrunment or some Ph strips. But I will attempt to take a shot just from my own assumptions. But first...I want to know a little more about this assumption...

I use miracle gro soil/fert and distilled water just so that I know i dont have to ph test. all three items are under 7 for sure.

Also...without knowing ppm of nutrient solution, will need to know how much of what you are putting into your water.

Either you have overferted and now there is a lockout due to toxic salt buildup(more than likely), or you have a Ph issue causing calcium problems. But like I said, this is just a shot in the dark. You really need to get some kind of way to measure Ph and ppm's.

Peace
BM

 

[ECUG]

As Brother_Monk said you need to find out your pH. Im betting that your ferts are a lot more acidic than you think. When was the last time you flushed your medium with plain water?

 

[topherfrog]

PH
distilled water5.8
recommended nute dose6.5
soil mixed with 7 water6.5

I have identified the problem as cal/mag

cal is in the soil
mag is in the fert.

the soil has slow release ferts aswell.
I think I am going to have to flush my next watering.
But I will be flushing with a low ph water. will this cause a problem as well?
Can I use the recommended amount of food every watering?

 

[topherfrog]

New nutes...for every watering in distilled

1/4 dose 10-52-10 (miracle gro)
1/4 dose 20-20-20 (miracle gro)
1 tsp molasses
1/2 tsp epsom salt
2 tsp 3% h2o2

sound good?

 

[ECUG]

Hey, I dont think you need to add molasses every watering. Also, why are you adding h2o2? I think it will kill any micro life you are trying to feed with the molasses. Im no expert, but that is my understanding. Also, the 10-52-10 could be cut back until you are getting closer to flowering, I think.

 

[topherfrog]

I am using molasses for carbs, I heard it adds flavor and nutes.
I am using h2o2 to add O to the low O water.

 

[Orangelazaris]

The carbs in the molasses dont feed the plant but the bacteria in the soil.

the H2O2 kills that bacteria so your just gumming up your soil.


Best
OL

 

[topherfrog]

ok....i'll take out the molasses.
what do you guys think of super thrive.
how do you use it for mj?

 

[MTF-Sandman]

I'd ditch the H2O2 personally and keep the molasses...you shouldn't need H2O2 for soil unless you already have root rot or are habitually overwatering them. ST really doesn't do much except help with stress - so if you transplant em, then give them a 1d/gal mix with the nutes to help ease the stress on em...otherwise it really doesn't do much for them.

 

[topherfrog]

is there organisims living in such a chemical heavy enviroment?
I use chem soil and fert.
still worth the mollasses?