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Yellow Leaves


iHigh
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Hi

 

Please help - 3 rows of 3 pots.   All a local cannabis craft soil. I have been feeding low doses of Biobiuzz nutes & stimulants  through a Blumat drip system. 

Strain is a  Purple Punch cross, ( that needs extra cal/mag and I gave a bit  ) .

The first row is airpots - and everything looking healthy and green

2nd two rows - locally made fabric pot - bottom big old leaves have turned a pure yellow ( now forming brown patches ) - no curling , no leaf tip burn - and newer leaves are a pale green .

Difficult to see in pic one - but right  two rows are the pale green ones.

 

I narrowed down to a  lack of Nitrogen, ( from what I can research ) so I have given a good feed of BioBizz fishmix.  

 

Question is - is this lack of N and why only two of the three rows with cloth pots ?

 

Lack of O2 due to fabric maybe ?

 

PS...There is a knat problem - but not too bad - they came in the soil

 

Please, any advice appreciated 

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