Light green leaves on top of the plant

[esesdzej]

Hello, plant has 3,5 week (moby dick xxl auto - dinafem). It grows in a 15l pot - soil Canna Terra Professional. Still on LST (1 rope on the bottom, 1 on the mid). Fertilizer used Canna Rhizotonic, nothing else. Temperature 25-27 degrees. Humidity around 70%. The colour starts to worry me, its like that since few days. Is it iron deficiency, blocked by soil Ph ? Bottom leave are fine.

 

[Kriaze]

Canna Rhizotonic is only a root booster and although the CTP has some nutrients it doesn't have enough to last very long (2-4 weeks max), so you should be feeding low doses of nutrients by now. Also as you don't mention your light I will mention that if you're growing under LED you will need to add CalMag to your nutes. All the best

 

[Kriaze]

Welcome to btw, I'm sure that you will find all the answers you need here

 

[esesdzej]

Thx for advice, will feed them today The light i use is a 400W veg hps. I have 4 plants in totall, rest is doing fine so far. Yet i can see some colour changes on the top as well, but not so advanced.