What is going on with this leaf

[Mañ'O'Green]

Interestingly, all three plants were from Garden Of Green breeder pack, GSC auto's. Obviously, the one dark green plant is different.
I feed 15ml/gal every three days in well water. Each plant gets on gallon. Feed PH 5.8-6.2. The medium is Roots Organic Original .I have a cheap soil probe, one of the 3 in 1 type. If I believe the probe reading, the PH of the medium is off the scale >7. Do I need to raise medium PH ? If so, best method. Thanks.

Sorry, do I need to lower medium PH.

@arquette what you need first is a soil probe that works. If you have relaibley been fertigating with 5.8 -6.2 PH then I doubt the probe you have is accurate. But this hinges on your PH water tester being accurate as well. I recommend an Accurate 8 Soil probe (or the clone of it) or a Blue Lab probe. if you go with Blue Lab be sure to get the correct one as they make several. I use Blue Lab test meters.

For organic Lemon Juice or vinegar for down and baking soda for up. Earth juice makes Organic PH up, down. Mix everything ahead of time and check PH again just before feeding.

 

[arquette]

@arquette what you need first is a soil probe that works. If you have relaibley been fertigating with 5.8 -6.2 PH then I doubt the probe you have is accurate. But this hinges on your PH water tester being accurate as well. I recommend an Accurate 8 Soil probe (or the clone of it) or a Blue Lab probe. if you go with Blue Lab be sure to get the correct one as they make several. I use Blue Lab test meters.

For organic Lemon Juice or vinegar for down and baking soda for up. Earth juice makes Organic PH up, down. Mix everything ahead of time and check PH again just before feeding.

I ordered an Accurate 8 soil probe and a new Apera PH meter. I have never really trusted the cheap pen style meter that I use to PH nutes. I am anxious to compare the two meters in a few days. If I need to use lemon juice or vinegar, do I just mix with plain water and put on the plant. Do I need to adjust the solution to a specific PH ? Any help appreciated.

 

[Mañ'O'Green]

I ordered an Accurate 8 soil probe and a new Apera PH meter. I have never really trusted the cheap pen style meter that I use to PH nutes. I am anxious to compare the two meters in a few days. If I need to use lemon juice or vinegar, do I just mix with plain water and put on the plant. Do I need to adjust the solution to a specific PH ? Any help appreciated.

Mix your nutrients first then PH it. I like to mix the nutrients in my reservoir the night before they will be used PH them and then PH again in the morning before the fertigation starts. Yes adjust the PH to 5.5 to 6.5 (from Roots Organics) I recommend 5.8 to 6.2.