Lowering Ph - GreenPassion.org - Dedicated to Medicinal Cannabis Cultivation and Education

Team42 · #1 (**permalink**) 09-17-2009, 05:31 PM

I am wondering what i should use to lower the ph of my soil? I am growing a white rhino strain, and my ph is right around 7. from everything Ive read on white rhino, they like a ph closer to 6. My plants are also showing signs of a potassium deficiency, and I cant help but wonder if they are related. On top of all that I have been treating a number of plants for powdery mildew all week.
please help!!! the team is anxious.

jangel · #2 (**permalink**) 09-17-2009, 05:44 PM

You can buffer your ph with dolomite lime. Pretty cheap and it will help. If they are already planted, then just bubble some water with the lime in it and use when you water. Or sprinkle some on the tops of the soil. and work it in gently. What is the ph of your water?

If your ph is out of wack, it will lock out your nutrients as well, hence the signs of shortage.

wahupta · #3 (**permalink**) 09-17-2009, 05:46 PM

Quote:

Originally Posted by Team42

I am wondering what i should use to lower the ph of my soil? I am growing a white rhino strain, and my ph is right around 7. from everything Ive read on white rhino, they like a ph closer to 6. My plants are also showing signs of a potash deficiency, and I cant help but wonder if they are related. On top of all that I have been treating a number of plants for powdery mildew all week.
please help!!! the team is anxious.

Sulfur (preferrably a burner) for PM. Dolomitic lime as a ph buffer (soil amendment before planting). If already planted, watering w/ a proper ph should eventually get soil right. Never seen a good soil meter for ph and don't rely on them myself. Never seen a potash deficiency either. If fertilizing w/ any type of complete nute, this should never be a prob. Maybe a misdiagnosis? There is always a chance that if your ph is way off that your plant is 'locked up' and not uptaking nutes properly. Flushing and starting over on nutes is usually the only fix for this. If unsure of nute deficiency, using a foliar spray of liquified seaweed (cold pressed is best) is usually a good 1st step in veg - I'm reluctant to ff anything in flower. Pretty safe and contains all micronutrients.

jangel · #4 (**permalink**) 09-17-2009, 05:47 PM

Here is a link to Plant abuse charts that will help you out with this. Also check the FAQ's at the top of the page, in the drop down menu.

Team42 · #5 (**permalink**) 09-17-2009, 06:58 PM

Quote:

Originally Posted by wahupta

Sulfur (preferrably a burner) for PM. Dolomitic lime as a ph buffer (soil amendment before planting). If already planted, watering w/ a proper ph should eventually get soil right. Never seen a good soil meter for ph and don't rely on them myself. Never seen a potash deficiency either. If fertilizing w/ any type of complete nute, this should never be a prob. Maybe a misdiagnosis? There is always a chance that if your ph is way off that your plant is 'locked up' and not uptaking nutes properly. Flushing and starting over on nutes is usually the only fix for this. If unsure of nute deficiency, using a foliar spray of liquified seaweed (cold pressed is best) is usually a good 1st step in veg - I'm reluctant to ff anything in flower. Pretty safe and contains all micronutrients.

I misspoke earlier I meant to say they look to be potassium deficient. I will send in a pic asap, and maybe someone could give me better idea.

jangel · #6 (**permalink**) 09-17-2009, 09:01 PM

Sorry! I didn't leave the list to plant charts!

Here it is now: Plant Abuse Charts