Dear Saad,

The pictures may indicate that you have iron deficiency.

Saad Farouk There are several possible reasons for that.

- Disbalance of applied hormones/plant growth stimulators - sometimes they are present in fertilizers, or biological control agents.

- disbalanced application of N and other macroelements.

- plant pathogens (there are some symptoms of mild virus infection on the older leaves)

I agree that the young yellow leaves have symptoms of Fe or Mg deficiency. It can be caused by too rapid growth of the shoots from fruit cluster.

ok, this symptoms appeared on some plants only meanwhile the other didn't show this symptoms while they treated with the same treatment

Disease or genetic disorder

Dear Saad,

This physiological disorder is mainly due to a lack of light during the day and heat at night.

thank you Dr Andrey

already we are in winter and the day is short but the night temperature is low , by the way we sprayed plants with some compound nutrients (NPK) it may the reason????

Nitrogen can trigger a shift towards vegetative growth. You need to remove part of the leaves on these plants or increase the amount of light during the day and increase the temperature at night.

it doesn't look like a physiological disorder. Possibly the density of your plantation is too tight at this stage and the plants don't receive sufficient light. As a result the plants will continue to grow vegetatively producing stems and leaves. The situation will obviously change until light will reach high levels for sustaining fruit set. Additionally you should check the Nitrogen supply in your hydroponic nutrient solution.

It has to do with nutrition, and specifically N to C ratio. simply to much nitrogen in your nutrient solution.

What fertilizers did you use exactly (the components)?Also the doses?

Trace element symptoms appear on the end leaves because of slow moving them.