what is wrong with this plan ??

[massiwo]

Hi, does anybody know what is wrong with this plant ?
4 weeks, 24h MH 250.






thanks
massiwo

 

[Cyklon]

Deffiency of one or more immobile elements. What is your pH and how much did you feed?

 

[massiwo]

PH is 8. I use verry little Bio Grow, the soil is Bio Pre Mix.

 

[Cyklon]

ph 8 is the cause of deffiency. 5.5-6.5 is more optimal. try adding precise amounts of nitric acid to your water before watering your loved ones.

 

[massiwo]

yes that is right, I will use ph 4.0 to decrease wahter ph.

thanks

 

[Cyklon]

It might be hard to get the pH right when watering with pH 4. It could drop lower than desired but also it might work really well. The alternative is to flush the medium with large amounts of water with pH 6.0 a couple times over a week or so and keeping an eye on the pH in the run-off water. When pH starts to coming close to desired level nutrients should be added.