jackspratt61
Active member
What are you using for a P amendment?
-
ICMag with help from Landrace Warden and The Vault is running a NEW contest in November! You can check it here. Prizes are seeds & forum premium access. Come join in!
is this a cal, mag, zinc or some other deficiency
- Thread starter zachrockbadenof
- Start date
Three Berries
Active member
I don't add any other than what is in the Master Blend. I do have some mKP that I use for a low pH buffer once in a while.
jackspratt61
Active member
Are you using dolemite?
Three Berries
Active member
I add some in the beginning and later in veg. Here's the current soil recipe with ProMix BX.
Soil mix per plant, 3 gal of ProMix Mx. 1 pt perlite. 2 qt worm casing. < for seed starting.
1 cup DS limestone. 3 Tbls 2K2MgSo4 <added for soil after transplant
5.5 oz of water to saturate 16oz cup of dry soil.
I didn't do much run off until three weeks into flower and found high pH. Two of the plants don't seem to mind at 7.1 or so but one does. It was way higher at 7.7 and now 6.8 but the damage is done.
jackspratt61
Active member
I was interested in promix until a friend got some of their organic mix that tested high in na. What was the starting ph for your promix?
You're mix is loaded up front with close to 2000ppm mg with those amendments not adjusting for cec. That's alot.
My soil will show a pH of under 4 when it is growing and the microbes are happy. I call that 'sparking', and I think it is the ions exchanging and messing with the pH probe. When the soil has no root activity the pH is almost 8. The water I pH down to 6.3, and check / adjust that twice a day as it tends to go up.
I recommend pH the water to 6.3, make sure it is 70-75*F, add a little cal-mag and epsom salts. That is the reservoir. Take water from there and add microbes, enzymes, humic and fulvic acids, and top water the soil. Let nature have a chance, and quit with all the ferts and nutes. Make sure the air is circulating inside and being refreshed. Temps 75*F humidity 50%.
Things should do just fine.
Wood ash increases PH and gives nutes the plant can use. I’ve added a tablespoon of semi hardwood ash to my two gallon watering can at times and had no adverse reaction. Matter of fact, my ka5h seemed to like it. You really don’t need tons of nutes. Stopping for a while might be a good idea.
Three Berries
Active member
Not sure of the pH as in veg I never ran to run off. The BX runs out of nutes after about two weeks and is way short on any Ca. Only time I've had a Mg issue is when I just did two waterings with straight rainwater on my current grow. I get too much sulfur though in the past treating with the langbeinite and little success, I add a 1/4 tsp of epsom to a gallon of nutes.
jackspratt61
Active member
all the mg is giving you trouble with k later on when the plant needs it. ca/mg about 10-12:1 in your media is good target. can't get there with dolemite.
i have foxfarms cal-mag, and i have epsom salts, as well as a bag of dolomite lime...
i am 'confused'
so my water out of the tap is 7.5... i left some water out for about18hrs, just checked it, and the temp shows 64F , n the ph went up to 7.9... as we say ... what the fuk...
so my water out of the tap is 7.5
when i mix the water n nutes, it drops to 4.4
when i add a teaspoon of baking soda (just a test, i won't use it on the plants) to 65oz of the nute mix, the ph is 7.5
when i check my soil, the ph is 5.4-5.6 depending on the plant, and thats after water only
so if i wanta get the ph somewhat over 6 , do i add some lime... epsom salt... cal-mag... or buy a bottle of ph up??
other then the bit of rust on a couple of the plants, all of em look good, buds r fattening up... its only 25day ,
jackspratt61
Active member
For now go with calmag since ph is low. K should begin being raised now too. I'd go with neutral ph to favor k,ca,mg uptake.
I have two 100 gallon tubs of soil that I recycle. The soil in my current run may have had two bags of supplements, and maybe a bag of dolomite lime put in thinking it hadn't been replenished. The soil is unbalanced but the plants are getting used to it. When I started I was using oyster shell powder and ag lime to get the pH up.
I think of living soil as being like a supermarket, and the microbes are the shoppers. They take stuff off the shelves and give it to the cashier (roots) as the plant requires. Microbes are the key, and fungus too. You want organic goodness going on in the soil. Filter the chlorine out of your tap water and have a reservoir and bubbler to further air it out..
The pH in my water reservoir will increase as time goes by because I have a fish tank bubbler in there. Maybe CO2 is changing the pH, I dunno, but it goes from 6.3 to 6.7 overnight. I lower the pH with a little pH down, and later it will be up again. This is feed day. I will draw 2 gallons, mix up a batch of top-feed solution, and add 1/2 gallon flowering period goodness to the shelves of the soil supermarket. That is a once-a-week treat.
I think of living soil as being like a supermarket, and the microbes are the shoppers. They take stuff off the shelves and give it to the cashier (roots) as the plant requires. Microbes are the key, and fungus too. You want organic goodness going on in the soil. Filter the chlorine out of your tap water and have a reservoir and bubbler to further air it out..
The pH in my water reservoir will increase as time goes by because I have a fish tank bubbler in there. Maybe CO2 is changing the pH, I dunno, but it goes from 6.3 to 6.7 overnight. I lower the pH with a little pH down, and later it will be up again. This is feed day. I will draw 2 gallons, mix up a batch of top-feed solution, and add 1/2 gallon flowering period goodness to the shelves of the soil supermarket. That is a once-a-week treat.
hey.... i watered the plants on tues very heavy, n they now again need water- i received a 2nd ph probe today, and it says 7.4 on the water , while the 1st one says 7.5- so they are close.. i will check the ec and now the runoff ph today...
i just added some foxfarm cal-mag 1/2 teaspoon to a 1/2 gallon of water, the the ph went down from 7.5 to 7.2, so no great drop- i will now water the plants n check the runoff and report back...
i just added some foxfarm cal-mag 1/2 teaspoon to a 1/2 gallon of water, the the ph went down from 7.5 to 7.2, so no great drop- i will now water the plants n check the runoff and report back...
every plant got about 60/70oz of water with a 1/2 teaspoon of cal-mag
i am using '2' diff ph meters
ec ph in runoff ph in soil
headbanger 200-300 6.7-6.9 5.2-5.3
sd kush 200 6.5 4.7-5.0
purplepunch 2520 5.6-6.1 4.7-4.9
runtz 1550 5.6-6.1 5.1-5.3
sour diesel 420-560 6.1-6.5 4.7-5.1
bx3 700-840 6.3-6.5 5.3-5.5
tha melon 700 6.4-6.6 4.6-5.0
to me.... knowing very little, apparently the ec's on some are low, and a couple are way high. the ph in the runoff's look close ... i am not sure of what to make of the soil ph's...
comments??
i am using '2' diff ph meters
ec ph in runoff ph in soil
headbanger 200-300 6.7-6.9 5.2-5.3
sd kush 200 6.5 4.7-5.0
purplepunch 2520 5.6-6.1 4.7-4.9
runtz 1550 5.6-6.1 5.1-5.3
sour diesel 420-560 6.1-6.5 4.7-5.1
bx3 700-840 6.3-6.5 5.3-5.5
tha melon 700 6.4-6.6 4.6-5.0
to me.... knowing very little, apparently the ec's on some are low, and a couple are way high. the ph in the runoff's look close ... i am not sure of what to make of the soil ph's...
comments??
linde
Well-known member
No don't use cal mag that will create more problems. Just flush with the tap water if you don't have regular pH up. Lime will work but probably take too long. Like I said earlier you have nutrient buildup in soil lowering the pH. Give them a heavy flush to remove excess nutrients. Buy some pH up to keep around
toooo late as i used a bit, but tomm i will flush the shit out of em... i just ordered a bottle of ph up.... thanks
linde
Well-known member
I noticed that after I posted. Lol my bad ....ya that cal mag won't be absorbed when the pH is that low. It'll just build up in the soil like the nitrogen did. Then you'll be up a creek without a paddle. A good flush does wonders. I just ordered another quart of pH up myself. Your tap water is high enough pH it should correct the problem with a couple good flushes or atleast get the plants going in the right direction.
The water may not have a lot of buffering capacity, which is good after you get the medium's pH right. Actually that's probably not bad. I would just let the nutrients' pH adjust the water to 7.0 and not use pH down.
Lime is best mixed with the soil. So when you're potting up that's a solution.
The way to get the pH right is to mix 2 tablespoons of magnesium lime/Maerl per gallon of soil (2 tablespoons for soft water) into the new soil, soak it for at least a day and then transplant.
The pH to go for is 7.0, not just over 6. If you want the fast growth mobile nutrients N, P, K and Mg to be easily absorbed, you have to stay away from the low pH's.
Too high locks out micronutrients and some secondary nutrients which show in the growing tops. So if that starts to happen, you'll know it's too high. What is the right range also depends on which medium you use. In soil, it's 7.0.
Last edited:
thanks to everyone... i'm flushing today...
jackspratt61
Active member
How does the two highest ec plants look? The ec looks low on everything else.
