Irrigation water ph and alkalinity for promix hp soilless substrate
- Thread starter Tommy125
- Start date
GreenGuy_1995
Well-Known Member
What does your PH reading look like after adding your feed nutrients?
If it's within range, then I wouldn't bother adjusting it.
Good Luck!
If it's within range, then I wouldn't bother adjusting it.
Good Luck!
TreeFarmerCharlie
Well-Known Member
Why are you measuring alkalinity ppm? This isn't a fish tank so just go by the pH.
Every representative of promix I’ve spoken to has said that ph ing irrigation water does not effect the ph of the promix itself. So very confused of what ph range I should be irrigating at, considering its a soilless medium
hotrodharley
Well-Known Member
Mix garden lime in the Pro Mix before using. And it doesn’t hurt to adjust the pH to the range we desire.
Ph is 6.5 to 6.7 after nutes. Also what would you recommend I do to the fresh water between feedings?
Promix hp contains lime in it. At what range would you recommend for this growing medium?
TreeFarmerCharlie
Well-Known Member
Right, but why are you testing the Alkalinity PPM? 6.3 to 6.5 works great for ProMix HP.
I’ve been irritating at 5.8 to 6.2 and have been having issues. If the ph is fine I may need to dial in my feeding better
TreeFarmerCharlie
Well-Known Member
What are you feeding, how often, how much, and at what dosage?
I’ve read a lot of horticulture articles stating high alkalinity irrigation has the tendency to raise medium ph. I was wondering if my water alkalinity was suitable
TreeFarmerCharlie
Well-Known Member
The pH will tell you if it’s alkaline or not. Testing the Alkalinity PPM (or dKh) is usually a test performed for things like salt water aquariums.
In mid bloom growing in 3 gallon pots I use flora 3 part micro grow bloom, I am feeding 4 ml micro 1 ml grow and 6 ml bloom per gallon around 500 ppm phd to 6.0. I am feeding every 3 days in a feed feed plain water schedule
TreeFarmerCharlie
Well-Known Member
I’m not sure what their recommended dosage is but, when I grew in ProMix HP (all last year) I fed at half the recommended dosage and only once a week. I tried feeding one set of plants full dosage during flower (still once a week) and it only took a few weeks of that to start having issues caused by nitrogen toxicity and nutrient lockout.
TreeFarmerCharlie
Well-Known Member
I would suspect lockout caused by over feeding based on how often you are feeding.
Thank you, that is what’s most likely going on, I got quite a bit of run off each time so I thought I’d be ok. A lot of people on here say they feed every iragation, so was confused on what I should do. I’ll start implementing only once a week feedings. Thanks
TreeFarmerCharlie
Well-Known Member
People who grow in coco feed with every irrigation. ProMix HP is peat based and should be treated more like a soil grow than a coco grow.
Thank you for the insight, I greatly appreciate it