Checked FAQ, still a little confused. Diagnosis?

[Brux013]

Hey rollitup,

I've tried diagnosing the problem before asking the question. The problem looks anywhere from phosphorus, zinc deficiencies to ph fluctuation. However I'm not really too sure.

Here are 3 picture of 3 different plants.

1st one is the oldest, the next 2 are two of the same age, all still in vegetation.

The set up consists of 3 10w soft whites, 3 23 or 27 watt (cant remember) daylights, and 2 23 or 27 watt (can't remember again) warm whites. Two fans blowing on the plants/lights. Water frequently throughout the week, standard nutes once or twice a week. (nutes aren't really anything wowish, probably just store brand tomato nutes for now)

Appreciate the look guys. And thanks in advance for the help

 

[ottertalkn]

A few questions. In the second pic, is that burning on the ends of the leaves? Is it prominent throughout the plant?

Are the symptoms you identified throughout the entire plant, or just at the bottom? You growing outside or indoors?

Without seeing the plant further, there could be a couple of issues, but I think it looks like you've got a nutrient buildup that is toxic for the plant. It could be something as simple as the EC of your water being way high, to the store bought tomato nutes creating a nutrient imbalance.

 

[Brux013]

A few questions. In the second pic, is that burning on the ends of the leaves? Is it prominent throughout the plant?

Are the symptoms you identified throughout the entire plant, or just at the bottom? You growing outside or indoors?

Without seeing the plant further, there could be a couple of issues, but I think it looks like you've got a nutrient buildup that is toxic for the plant. It could be something as simple as the EC of your water being way high, to the store bought tomato nutes creating a nutrient imbalance.

Thanks for the reply. In regards to the second picture, it is more abundant on the older leaves, the newer ones not so much. The leaves are somewhat crispy. It might be due to the lights, but I'm not sure. The temperature is 80-84F. and Humidity is around 40%. (Also grown indoors.)

The first picture has spots on the older leaves. None on the newer ones. Hope that helps to better explain the problem

 

[ottertalkn]

I think you may have a potassium deficiency. If a plant has a potassium def., usually you will see healthy dark green foliage with the younger leaves, with the leaf margins of older leaves turning rusty brown with development of rust colored spots. The tell tale sign, or at least my experience is the stems become weak and brittle.

The way this happens is fluxing pH (best to keep around 5.7 - 6.3) and the Potassium gets locked in soil by using water with high salinity. Do you have a water softener in your house? I had that issue and had to start using distilled water. It got expensive, so I bought a distiller and no problems since.

I hope this helps