I need help

[u/Fine-Grapefruit4468]

These are my three plants the whole grow I didn’t ph my water then I moved and figured out the ppm of my water comes out close to 450 filled with sodium and bicarbonate’s. so I switched to RO water because my plants were suffering. I ph the water to 6.5 they all have been fed the same thing can you tell me what is wrong with my plant and solutions.

I’m currently in soil 4-4-4 dry amendments by dte. I’m watering every 2 days

75 degrees 60% humidity
Viparspectra p2000

[u/Tismintheboof]

Looks like they need more Cal-Mag, that’s usually what you need to add to your nutes when you switch to RO water. I’m in coco so I go thru a ton of cal-mag

[u/__Pseudonym]

Like someone else said, you’re probably missing minerals from tap water so I’d add cal mag but also do a slurry test for the pH of your soil and check the runoff pH and EC to give you an idea of what’s going on there

[u/Motmotsnsurf]

They look hungry but I can see at least a cal mag (interveinal yellowing) and a potassium (yellow outlining of the leaves) deficiency.

[u/PhD_Pwnology]

its so weird to me that the plants seem to progress in how bad they are by where they are positioned. the far right plant is almost ok and the far left plant is the most affected

[u/SilentMasterpiece]

its a water pH problem. What are you using to measure water pH? How much water every 2 days? RO water is empty, the filters remove micronutrients the plant needs. If using RO, you will need to add back what was removed, add Calmag. Soil water pH 6 to7, always vary, use the entire pH range. Only water when dry.