Brown ish patches on leaves

[Flow]

Hey guys
so after the motion for the first 3 weeks cause of not feeding them they finally went right.
So now 2 days after watering them i found these patches this morning. I would think that it is due to the ph that is very neutral.
What do you guys think?
I ll probably add some sulfur at the next watering.

the 3rd pic is another plant.
the 2 first are the same plant.

 

[Tersky]

First two look like ph issue, not sure if it's too high or too low tho. The last one looks like slight nute burn. I would lower your nute strength very slightly because it doesn't look too bad. Are these in soil?

 

[Flow]

Hey Tersky
Thanks mate.
that s what i was thinking too about the 3rd pic.
the PH is on 7 so sulfure at the next watering or should i rewarer them tonight with sulfur. They are in 14 litres pot in coco.

 

[Tersky]

one thing ive learned with coco is not to pay attention to runoff ph and the soil tester probes i have found to be lacking. I've killed too many plants trying to get my runoff to the right range. At least in fabric pots. As long as you feed with a ph of 5.8 to 6.2 and allow 20% runoff your ph will always be good. I've never used sulfur so i dont know how well that works in coco.

 

[Flow]

Ok thanks.
Now how do you get your water down to 5.8 6.2.?

 

[Tersky]

i use ph up and down from General Hydroponics personally tho there are others out there. I fill a gallon jug (can be whatever size, mine are just a gallon tho), add my nutrients and then check the ph of the solution. Then i ph it to 5.8-6.0 range then water my pants to 15-20% runoff. Then i wait until the pots are light then repeat.

 

[Flow]

Sweet.
probably much easy than the powder sulfur.
thanks Tersky. Thanks for clearing up my mind.