Leaves yellowing too much mid flower

BasedGardener

BasedGardener

Member
I'm growing OG Runtz in soil for the first time. Small personal grow. I had two plants, put one in to flower earlier since I wanted the second to veg a bit more, this one just finished. It started yellowing a bit early, but not as bad as the second still in flower. The first one has been chopped. Second one is about five weeks into flower leaves are yellowing and coming off way faster than they should. They started yellowing at around week three. The first plant showed minor nutrient burn at the time it finished, so I thought I'd reduce the nutes for the second - but I haven't reduced them a lot.

I wasn't PHing or measuring the PPM of the water/nute mix for the first plant, but started to for the second plant about when I put it into flower. I thought that since there should be plenty of N in the FF Trio and the soil, it must be a PH issue and/or nutrient lockout. The PH was about 4.2, so I added PH up to get it to 6.2. Now, I've read a couple places that you don't really have to use PH up for your nute solution in soil, and adding PH up will do more harm than good. I thought that a PH of 4.2 would be way too acidic even for soil. The PPM was also way high so I watered down the nute solution, to get it under 1100.

Despite the yellowing, the buds are still growing and look fine. I suspect that the yellowing will eventually catch up to the buds for reduced yield.

Help! Recommendations?

I'm using:
Fox Farms Trio - a little less than recommended
Cal Mag - 1ml per gallon
Terpinator-10ml per gallon (which is lower than recommended)
Flower Fuel - 1/2 recommended
Black Gold Soil

I know some of these can burn if too hot, but I'm not getting nute burn symptoms, leaves are just yellowing and coming off.
 
BasedGardener

BasedGardener

Member
Boatguy said:
Yeah. If he or she has been feeding at 1100 ppm every watering in straight black gold soil.. There would be some serious buildup, and no way to effectively flush it out without drowning the plant in the process.
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My pre flower nutes weren't that high, about whatever the FF soil recommendation was per gallon for soil. I flushed with Bush Doctor before flower.

Also, this was a three month veg in a 7 gallon fabric pot, it shouldn't be root bound.
 
lakesidegrower

lakesidegrower

Well-Known Member
I roll with organics so I don’t want to mislead you here, but it does look kinda like a fade from N being pulled from the leaves, to me it doesn’t look terrible. My best guess would be that either the N ran out too soon when switching to the bloom nutes, or N got locked out and the plant pulled from the leaves earlier than usual
 
BasedGardener

BasedGardener

Member
lakesidegrower said:
I roll with organics so I don’t want to mislead you here, but it does look kinda like a fade from N being pulled from the leaves, to me it doesn’t look terrible. My best guess would be that either the N ran out too soon when switching to the bloom nutes, or N got locked out and the plant pulled from the leaves earlier than usual
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I'm going to guess that it got locked out from the PH being too acid. I only started using using PH up recently. At the rate of yellowing, I'll have lost all fan leaves by week 6. What would your recommendation be from here?

Also, I took some clones when lollipopped that I was going to set to flower when they got to about two feet. Should I continue to use PH up to keep the mix above 6 and also try to keep the PPM of the nute solution below 800 in veg and below 1100 in flower?
 
MyBallzItch

MyBallzItch

Well-Known Member
Where are you getting such acidic water? Or were those your slurry results? Looks like your p is getting locked out (purpling top leaves.. really low ph) get that ph up to mid 6
 
O

oill

Well-Known Member
BasedGardener said:
It's in the low 70s. Should be ok.

What is the best move going forward with this plant?
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Feed it with a base nutrient with some nitrogen.... but gently and feed it at the correct ph til you get run off at the same ph. Then let it dry out a lot and resume feeding at a gentle rate. Make sure the water going in is good ph.
 
BasedGardener

BasedGardener

Member
oill said:
Feed it with a base nutrient with some nitrogen.... but gently and feed it at the correct ph til you get run off at the same ph. Then let it dry out a lot and resume feeding at a gentle rate. Make sure the water going in is good ph.
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Is using PH up when needed ok? I found that with all the regular nutes in one gallon, the PH is about a 4 something, and the PPM is a little high, but not too bad, but then when I add the PH up, to get it to 6 something, the PH UP boosts the PPM too high. I guess the solution would be to use less nutes so I don't have to use as much PH up. Am I thinking right?

My water is a 6.7.
 
BasedGardener

BasedGardener

Member
MyBallzItch said:
Where are you getting such acidic water? Or were those your slurry results? Looks like your p is getting locked out (purpling top leaves.. really low ph) get that ph up to mid 6
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I use about one gallon of water when I water. I alternate between plain H20 and nutrient solution. My water is about a 6.7 out of the tap at <300PPM. When I add all my nutes to the water it drops the PH to a four something, so the last two weeks or so I've been using PH up. There were no signs of problems in veg. I flushed with Bush Doctor about a week before setting to flower.
 
MyBallzItch

MyBallzItch

Well-Known Member
BasedGardener said:
I use about one gallon of water when I water. I alternate between plain H20 and nutrient solution. My water is about a 6.7 out of the tap at <300PPM. When I add all my nutes to the water it drops the PH to a four something, so the last two weeks or so I've been using PH up. There were no signs of problems in veg. I flushed with Bush Doctor about a week before setting to flower.
Click to expand...
Have you checked your ph after each thing you add to see what's bringing it down like that? A hard water 6.7 shouldn't be easy to bring down like that. How much ph up are you requiring?
 
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