Yellowing, crispy tips

wallSHIT said:

So i decided to mix up some of the FF big bloom and tiger bloom, just under the amount they recommend for foliar feeding, and sprayed them down. I have had problems with ph in this soil in the past, but i got my runoff just right, but i have noticed that when the soil drys about 2 days after my nute feeding there is what looks like salt build up on the top of the soil. I guess i should just get in the habit of bi or tri weekly flushes?

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I've never used FF nutes before, but it seems awfully odd that they would have an excessive salt buildup. But like i said, I've never used them before. Is it possible that you're using too much? I don't think it's necessary to flush that often, unless you're using too much nutes, or epsom salts, or baking soda, or something like that? I only flush once during the entire growth cycle,(about the 6th week of bloom) and never had a problem with salt buildup or nutrient lock. I would say that once every 4 weeks would do the job really well, so that might save you a little time and effort.

jawbrodt said:

I've never used FF nutes before, but it seems awfully odd that they would have an excessive salt buildup. But like i said, I've never used them before. Is it possible that you're using too much? I don't think it's necessary to flush that often, unless you're using too much nutes, or epsom salts, or baking soda, or something like that? I only flush once during the entire growth cycle,(about the 6th week of bloom) and never had a problem with salt buildup or nutrient lock. I would say that once every 4 weeks would do the job really well, so that might save you a little time and effort.

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From what ive read, they are notorious for salt build ups. I am following their schedule (which ive read is about double what you need) and ive seen what looks like salt build up on the soil. At this point i dont use epsom or anything else. This is also why im not quite certain as to my problem.

So from what it looks like right now, the foliar feeding seems to have drastically slowed the yellowing and dark spots. So this is leaning toward a still incorrect ph, but my waterings have been 6.5 and my runoff has been between 6.5 and 6.6. I may change soil one of these grows, thinking FF ocean forest, just because it seems to be a great soil and sounds like its smart to stick to nutes and soils that work well together.

^That's an excellent decision. FF OF soil is a guaranteed winner, proven by many growers. I recently switched to FF myself, and am very happy with it. It's nice to have that 'peace of mind', and not wondering if your soil is good enough or not.

I also think that you aren't having a PH issue. If you're runoff is coming out at 6.5-6.6, then your soil PH will be about the same. Hmm....I'm not sure about that one. Anyway, glad to hear that the foliar feeding has stopped the problem. I guess the best option right now, would be to flush and then feed some 1/2 strength fert(something with micro-nutes), then transplant to some FF soil as soon as possible.(and then don't feed them for at least 10 days)

Switched to FF ocean forest, not seeing much of an improvement in the problem, but its still only been a week. I did borrow a tds meter and tested my water source (tap) and found that the ppm is 30, which seems extremely soft. Could this also have something to do with it since i have never added calcium to my water? It seems that i only really run into problems after about 5 weeks (about 1 week into flower). Could this be my rich soil losing its nutrients over time and the plants not getting enough calcium?