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recirculating dwc - femmed mango with nute problem

british green

New Member
Hi I've got a 4x4x7 foot Room with a 600hps and 200w cfl lighting the room . I've got good ventilation and temps are pretty much constant . I have a exhale co2 bag and I'm feeding them with canna nutes a and b Flores . There's a air stone in each bucket and in the res . The plants got flipped about 2 weeks ago and the nutes got changed 5 days ago from Vega to flores and I have this problem with the leaves .
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any help would be great . I've have seen the leaf deficiency chart but I have a slight problem with it being colour blind with greens Brown's / reds etc etc . Thanks again Steve
 

chunky monkey

New Member
Re: recirculating dwc . femmed mango with nute problem

I don't grow dwc pal but that's definitely a magnesium problem what's your ph it should be 5.8 your plant also looks quite dark so I'm going to I think your ph is too high
 

chunky monkey

New Member
Re: recirculating dwc . femmed mango with nute problem

I would try som magna cal ,soft water contains less mg and calcium so that could be the problem I would also cut back on nutes a bit your leaves look very dark green to me
 

Antics

420 Member
Re: recirculating dwc . femmed mango with nute problem

It strongly resembles a magnesium deficiency. The fact that it's happening under the stronger light, I would think that the HPS causes the plant to use more nutrients, since more light is available for photosynthesis.

I could be wrong on that second part, I'm just guessing there. But my first guess on the problem is magnesium.
 

Cottonballs

New Member
I have had this problem as well, kjc replied to one of my posts but I had a ph issue and switched nutes to dyna gro, bloom and i added cal mag. It completly solved the yellowing leaf so keep at it and keep updating!
 
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