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11-28-2007, 03:15 PM #1Senior Member
Why has my Ph droped?
The growing concensus is that most are using HP and not BX anymore due to the lack of perlite in bx and the added vermiculite. Most promix growers are adding 1 tbls of lime to to 1 gal of HP, and about 20 percent more perlite. HP also has MYCORISE.
I have seen side by side grows of bx and hp, clones nothing added at all and the hp grows better plants.
Optimum ph in promix is 5.6 to 6.2 You should adjust nutrient solution ph to about 5.8 to 6 after everything is added. This ph seems low but is necessary to make iron, manganese, zinc, copper, boron, and phosphorus available to the plant. At higher ph, these become less avail. to the plant.
Biggest problem with the promix thing is that the lime charge that provides the plant calcium and magnesium is going to run out after repeated waterings. I doubt the foxfarm nutes have alot of cal mag. I would say after a couple weeks, calcium and magnesium should be added at a low rate to water. 1/4 teaspoon of powdered gypsum or calcium nitrate + 1/4 teaspoon epsom salts per gallon of water can be used to do this. Add everytime if def. occurs such as mag def with green veins on bottom leaves but geting yellow.
If you are going to keep them in promix, keep it wet and feed every other time with small amounts of ferts.
BUT it looks like the damage is done.growbe Reviewed by growbe on . Why has my Ph droped? I grow in soil, righ now i am in 2 gal. pots. I have 6 plants that are about 25-26 days through veg. I have been using only growbig mixed with rested tap water. I started at 1tsp/gal after 1 week of veg have worked my way up to 2 tsp/gal. My plants look healthy and all, but today when i watered and tested runoff Ph almost all of my 6 plants tested at around a PH of 5.... Why is my Ph droping?? I was thinking possible salt build up, I heard that FoxFarm products tend to create alot of Rating: 5
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