Need advice with yellowing plant groth

I think it is magnesium deficient. Give tghem 1/4-1/2 tsp teaspoon of epsome salt per gallon of water. They also have heat stress. Thats why the leaf edges are folded over. Do you know the pH of the wool? Your ferts should have all nutrients in them.

 

Check the run-off pH. What type of meter do you use to measure pH and is it callibrated properly?

 

There is your problem; pH is off. It should be between 5.2-5.8.

 

Did you pre soak the R/W at 5.0 pH prior to planting?

R/W have a high base and need to be soaked for 24hrs in 5.o pH to aclimate them for hydro.

Are you using a cheap soil type probe meter?

 

I would,just dip them drain save and test over untill you get the desired pH,im very suprised the 5.5 pH solution you use didnt just adjust the R/W in a day or two?

 

68F. is what i use as it seems best,the lower the temps the better the DO concentrates in solution but at what point does this become a problem,idk.

It is very easy to add an aquarium heater if the res solution is too low(this is rare though as most struggle with too high solution temps).

pH in /pH out and(test runoff) make your decission on a number which would counter that and make it what you need next for your next watering/feeding.

When i use new soil i know it will drop my pre pHed water so i counter it by using 7.0-7.2 so my runoff is 6.3-6.7.You play with this and you will KNOW what they need every time also looking at the plants color. They do talk,if we listen and react we winn.

 

Meters are your lifeline till you can read plants,and testing plants solutions is done 1-2 time a day and need to be calibrated weekly for best results.

Some get lucky and never learn the curve and others use them and calibrate them and learn what and why it does what it does and when, and they will be better gardeners sooner than the just lucky ones for sure.