Hello
I have been growing for 15 years or so and have never had this problem i can not figure it out.
I am growing 4 super silver haze. I use a 600 watt bulb and fox farms nutes and cal-mag.
Ow and super-thrive when veg stage. My water is 8 ph and my soil or root ph is 6.5
I was like 4-5 weeks into flowering and the leafs started getting yellow and stems purple. I was thinking mag def.
I checked ph and added cal-mag. It seemed to slow down but not get rid of it. Now i am at harvest and it is still has
leaf yellowing and drying out dyeing, I am stumped.
Should i lower my water ph before mixing my nutes? or i have been reading on adding epson salt.
I have had so many awesome grows this is stumping me anyone have any ideas?
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Are you following the feeding schedule for ff nutes is so are you flushing as well as they recommend?
You should always ph after adding your nutes never before ff has a tendency to drop ph very low
I’m suspecting it’s a ph issue
What are you reading ph with ?
a picture is worth a thousand words as well and you should also fill out a support ticket
Happy growing 
CB
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@Countryboyjvd1971 raises a good point. We had a topic a week or so back that was discussing ph meters. If you haven’t already, you should calibrate your meter.
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I do use there feeding sch.and i do flush regular as they show. And i use a cheeper 25 buck 4in1 soil probe.
I check my ph on a day i dont feed. so maby its 6.5 before i feed and with feeding it lowers it i will start checking my ph after i feed.
Or break down and buy a good ph meter. But i have grown 8 different strains from Roberts site and all have been awesome
i have never had a nute problem before.
Thanks for the tips.
Here is a pic of a top tricomes are all cloudy and its so close to harvest. But as you can see the leafs and turning not in a good way as i flush.
@thaI, IMHO, those 4-1 probes suck, I have one and they are only good to check moisture which nobody needs them
For that… I would highly recommend a ph pen with a tds meter… Fairly cheap on Amazon but some of the better ones are around 50 bucks… They go up from there… I have the cheap ones that come in combo kit for like 20 bucks for both meters