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Phosphorus Deficiency


2bkiek8
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Hello GreenHouseSeeds, I've recently purchased a pack of SSH and WW.

All seeds have sprouted, and on the 4th week of veg. the lower leaves have developed black/brown spots and are turning yellow.
This has only happened to 3 out of 6 plants.
They are in BioTerra Professional fed with BioVega & BioRhizatonic according to the BioCanna schedule.
BioVega already has phosphorus in it, pH is 6.0.

Can you tell me why is this happening and what can I do to fix it?

post-38575-0-96796200-1456703814.jpg

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