Please help, my plants are dying

[Karas]

What is happening to my plant leaves?

Strain - white widow
# of Plants - 3
Grow Type - Soil
Grow Stage - Vegetative
Bucket Size - 2 Gallon
Lights - (1) 400 Watt HPS
sMedium - 75% Perlite 25% Vermiculite
PH - 6.7-7.3
RH - 70
Room Temperature -78 to 86
Solution Temperature -65 to 69
Room Square Footage - 10' x 10'
Pests - None Known
Thank you in advance

 

[Karas]

At first, I had only one problem. The leaves were yellow between the veins.

Now, I have one more... ​

Strain - white widow
# of Plants - 3
Grow Type - Soil
Grow Stage - Vegetative
Bucket Size - 2 Gallon
Lights - (1) 400 Watt HPS
sMedium - 75% Perlite 25% Vermiculite
PH - 6.7-7.3
RH - 70
Room Temperature -78 to 86
Solution Temperature -65 to 69
Room Square Footage - 10' x 10'
Pests - None Known
Second month of vegetative growth
What is happening to my plants?
Any idea?

 

[FRANKLIN]

Hey whats goin on? Without any detailed info such as nutrients given and amount, humidity, temp, ph, type of light and how far away, i would guess for the 1st set either magnesium or zinc def. (due to lockout though, i have no idea because of lack of info)...as for the 2nd set looks like late stages of the above problem due to the location of necrosis on some of the leaves...possibly even late stage of phosphorus def.

 

[FRANKLIN]

I see your ph swings up to 7.3 and as low as 6.7...are you ph'ing your solution down to 6.7 and it rises up to 7.3? If so how long does it usually take to do so? Try ph'ing down to 5.5-5.8 and letting it rise to 7.0 to not only lower it down to the recomended ph for soiless/hydro mediums but will also widen the range for nutrient availability...I might be wrong but lookup nutrient availability chart, im pretty sure anything over 6.5 in soiless locks out a few nutes...one more question, it says you are using soil, then says medium 75/25 of perlite/verm?

 

[Korloin]

I saw that too! If you haven't I'd probably flush the soil and start fresh. I had a similar lockout prob. Pretty sure it was K in mine. I was using the harder, hard water in my house which had a ph variance of .7 alkaline from 6.3 of the less hard. I could see the mins swirling around when I'd fill my 1 gal growler! (noob inexperience) but I flushed them and used only the lower ph water after filtering. They all bounced back in a day.

 

[Outragedpluto]

Hey man try looking at this link. This is a really good guide to plant abuse and helps you fix the problems. I would also agree with the others though that it looks like zinc deficient and possibly advanced deficiency. If all you are using is perlite and vermiculite both are sterile and have no nutes in them. I would say you need to feed her more. But I'm no professional lol
Plant Abuse Chart

 

[Reetafour]

I found a great tutorial that has pics that look exactly like yours. Go to the grow room tab at the top of the page,last listing is pests and problems or something like that and the 4th sticky note has this Cannabis Plant and Pest Problem Solver . It shows an MG def that looks exactly like yours good luck.

 

[Korloin]

I found a great tutorial that has pics that look exactly like yours. Go to the grow room tab at the top of the page,last listing is pests and problems or something like that and the 4th sticky note has this Cannabis Plant and Pest Problem Solver . It shows an MG def that looks exactly like yours good luck.

^^First try this^^ if not helpful, then This is good too!

 

[StratocasterDan]

At first, I had only one problem. The leaves were yellow between the veins.

Now, I have one more... ​

Strain - white widow
# of Plants - 3
Grow Type - Soil
Grow Stage - Vegetative
Bucket Size - 2 Gallon
Lights - (1) 400 Watt HPS
sMedium - 75% Perlite 25% Vermiculite
PH - 6.7-7.3
RH - 70
Room Temperature -78 to 86
Solution Temperature -65 to 69
Room Square Footage - 10' x 10'
Pests - None Known
Second month of vegetative growth
What is happening to my plants?
Any idea?

pH is too high, and you have a magnesium deficiency. Balance the pH and all else should come in check.

 

[natureman]

At first, I had only one problem. The leaves were yellow between the veins.

Now, I have one more... ​

Strain - white widow
# of Plants - 3
Grow Type - Soil
Grow Stage - Vegetative
Bucket Size - 2 Gallon
Lights - (1) 400 Watt HPS
sMedium - 75% Perlite 25% Vermiculite
PH - 6.7-7.3
RH - 70
Room Temperature -78 to 86
Solution Temperature -65 to 69
Room Square Footage - 10' x 10'
Pests - None Known
Second month of vegetative growth
What is happening to my plants?
Any idea?

number one,your ph is too high,should be around 6.0,no less then 5.5 or above 6.5.
You have a magnesium deficiency.
If you're feeding them a nutrient regiment and you're following the directions then there should not be that bad of a deficiency.
You can mix some Epsom salt into your soil to try to correct the issue.
Add two tablespoons to a gallon of water and water as usual.
You should begin to see a difference in a few days.
Good luck.
One more thing,I never use cal mag,seems like a waste of money to me.
There are more natural ways to correct whatever might be wrong with your plants.

 

[natureman]

number one,your ph is too high,should be around 6.0,no less then 5.5 or above 6.5.
You have a magnesium deficiency.
If you're feeding them a nutrient regiment and you're following the directions then there should not be that bad of a deficiency.
You can mix some Epsom salt into your soil to try to correct the issue.
Add two tablespoons to a gallon of water and water as usual.
You should begin to see a difference in a few days.
Good luck.
One more thing,I never use cal mag,seems like a waste of money to me.
There are more natural ways to correct whatever might be wrong with your plants.

One more thing,order a bottle of sledge hammer flush by Fox Farm Nutrients.
give a good flush to get out the salt build up.
then add the epsom salt to your water and water your plants as usual.

 

[StratocasterDan]

Flushing is an excellent suggestion - I do not grow in soil, but nutrient buildup can carry through into flower - soil growers are wise to flush well, both before the switch to flower, and every couple of weeks thereafter to avoid salt build-up. Fox Farms is good, but powerful stuff (the flush is good and can be used as directed, but their other nutrients can be tricky to dial in, especially of growing multiple types. Some plants like heavy feeds, some like much lower. Best to err on the side of too little nutrients and adjust as requires, or risk burning your plants (leaves do not recover from burn as the tissue is permanently damaged. Good Luck! Oh, I often visit growweedeasy.com to diagnose specific problems. Nebula has put together a really good resource there - good to check in the forums, but too often you get conflicting ideas from different growers who have found success doing things that may or may not match your particular strains or growing environment. Cheers!