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Phosphorus Deficiency? and Bloom Boost?


New Member
Hi all - I could use some advice on this plant:
My best guess is phosphorus deficiency


Strain - bagseed
Soil - Ideal420soil (mineralized), myco-rhizostim
Grow Stage - 6 weeks @ 12/12, after 6 months veg
Bucket Size - 4 Gallon - transplanted from 2gal 1 month ago
Lights - (3) 300 Watt LED, 1 with bloom switch
RH - 30% to 55%
Room Temperature - 70 to 85
Room Square Footage - 4' x 3 scrog, 4'x8' room'
CO2 bag
Small oscillating fan and constant gentle exhaust
Brita filtered tap water - no details known

Ideal420Soil is built to be "Just Add Water", so
I have generally not used nutrients, except:
1/2 strength worm tea every other watering
for the last 2 months.
1 dose Cal/Mag+Iron 5 wks ago
1/4tsp Open Sesame 4 wks ago

Two other plants treated similarly just have normal yellowing of older leaves. These plants have always been very dark green - almost waxy looking - like borderline too much N, and the yellowing just started a couple weeks ago, and got severe in the last week. Also, the buds aren't bulking up very much

So I'm hoping to correct any deficiency, and wondering what I can safely use to plump up the buds and boost resin. My impression is that chemical nutes mess up this kind of soil.

Things I have available are:
GO BioThrive Bloom
GO BioBud
Earth Juice HiBrix Molasses
Organic Gem Liquuid Fish Fert 3-3-0.3
Mag-i-cal Limestone (non K) with Humates
Rock Phosphate
Glacial Rock Dust
Garden Gypsum

Thanks for any suggestions


New Member
Many strains tend to have yellowing shade leaves towards end of flower, I would not treat until you confirm there is a problem.

How often and what is amount of nute strength you have been using?

Plant looks happy! great job slowgro:high-five:
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