Irrigation water ph and alkalinity for promix hp soilless substrate

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Tommy125

Member
My well water is 8.2 ph 125 ppm and 60 ppm alkalinity. I have been having issues, I ph down the water to around 6 for feeding.do you think I would be better off not using ph down?
 
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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!
 
T

Tommy125

Member
TreeFarmerCharlie said:
Why are you measuring alkalinity ppm? This isn't a fish tank so just go by the pH.
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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

hotrodharley

Well-Known Member
Tommy125 said:
Every representative from promix I’ve spoken with has said that ph ing irrigation water does not affect the ph of the promix itself. So very confused what ph range I should be using with this soilless medium
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Mix garden lime in the Pro Mix before using. And it doesn’t hurt to adjust the pH to the range we desire.
 
TreeFarmerCharlie

TreeFarmerCharlie

Well-Known Member
Tommy125 said:
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
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Right, but why are you testing the Alkalinity PPM? 6.3 to 6.5 works great for ProMix HP.
 
TreeFarmerCharlie

TreeFarmerCharlie

Well-Known Member
Tommy125 said:
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
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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.
 
T

Tommy125

Member
TreeFarmerCharlie said:
What are you feeding, how often, how much, and at what dosage?
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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

TreeFarmerCharlie

Well-Known Member
Tommy125 said:
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
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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.
 
T

Tommy125

Member
TreeFarmerCharlie said:
I would suspect lockout caused by over feeding based on how often you are feeding.
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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

TreeFarmerCharlie

Well-Known Member
Tommy125 said:
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
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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.
 
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