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damanc

damanc

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Can someone tell me what this looks like it could be? The yellowing started sometime between the end of the 5th week or beginning of the 6th week of flower. The edges of the leaves started to yellow first and then worked it's way towards the middle of the leaves. Some leaves have some brown spots as well and look burnt. I raised my light and lowered the intensity first because the leaves are all towards the top of the plant which also made me think it could be a problem with either a deficiency or overfeeding of a mobile nutrient. I didn't have any problems until now. It's a Moon Rock Pheno Fem. plant/seed.
 

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Calcium, magnesium and iron. Probably a PH issue because your in flower. Fading real fast also. When there are abundant bud locations most fan or support leaves get sucked dry of nutrients and if you try to raise the ratio to fast you will get neutrient toxicity. Harvest time is near.
 
I agree with Mr dirty. Probably a ph issue behind it all but overall lacking nutes. You are far enough along so it’ll be ok, they might have just lost a bit of potential. What type of nutes are you using? It may not be too late for one last feeding. I wouldn’t stress too much it at week 6 though.
 
I'm using Fox Farm line nutes. For flower i been using big bloom, Tiger Bloom, and bembe. I followed the Fox farm feeding chart and stopped grow big, calmag, and Microbe Brew the beginning of 5th week flower. I also used Boomerang up until the 4th week flower.
 
FF ratios and feeding schedules are like most nute pimps, gathered in a controlled environment and pushed to the limits in order to sell product.
 
damanc


You can use this chart as a general guide to what your plants want when. I use it to pair down the amendments I actually need and not what the manufacturer wants to sell me. Only thing I would change is to start cal/mg a couple weeks earlier.

I like to run a 50/50 blend of grow and bloom up into week 6 of flower to keep the nitrogen levels up so that the plant has enough to keep everything green along with using it to help build more flower. If you refer to the chart you can see that Nitrogen uptake actually INCREASES after flip and tops out around week 2 -3 after flip. So what is happening in those 2 -3 weeks after flip? The plant is transitioning to flower. This would lead me to believe that increasing Nitrogen at this time is needed for flower site formation and general stretch that cannabis exhibits in the 2 -3 weeks after flip.
Calcium and Magnesium are the main building blocks for branches and cell walls. Potassium maintains turgor pressure in the branch system. Silicate will enhance what calcium and magnesium are building. These are the main nutrients that contribute to plant growth, Nitrogen fuels photosynthesis that provides the food needed for these plants to finish the chemical processes needed for growth. After week 6 of flower the plant has done most of the structural building(Branches and leaves) its going to do and will concentrate whatever energy it was using for that to flower production. This is one of the reasons you tend to see flower swell in those last weeks.

nutrient needs in stage.jpg
 
I do not understand your stopping of cal/mag. Continuing could slow down the yellowing progression. I use cal/mag seedling to harvest and have very little preharvest yellowing . Having discontinued using it has likely contributed to a deficiency. Give them cal/mag and check your PH. This is not reversable but possibly could be slowed. Can't hurt.
 
A fast way of finding out if you are having a cal or mag deficiency is to do a foliar spray. You should know within 48 hrs.
 
I was just following the Fox Farm Feeding Chart but I will definitely give it some CalMag. If I foliar feed it do I spray the buds too or not?
 
Ok, give them some calmag for sure. Maybe a light dose of nutes, but what’s the ph looking like? You may have nutes left that aren’t being used due to the ph.
 
There are several articles on line that will tell you to stop using N in flower, Maybe it works for them but it didnt for me. I would go with the Cal/mag comments , keep an eye on the PH if thats not right all the cal/mag you can buy wont help and I would cut all those damamged leaves, auto or photoperiod, they are not helping and they wont heal.
 
Yeah this is the first time I had this problem using the Fox Farm feeding chart. But along the way I don't give full doses because it says I can give those doses twice a week which I think is way to much. They also say to flush like every 3 to 4 weeks but I usually don't do that. Somebody else grew these 3 plants up until the end of the first week of flower. They really couldn't give me any info s about how much nutrients they were giving it other than they were using Fox Farm. So I think it could have something to do with that as well. So usually I don't follow it to a tee. I give it the nutes it says but different amounts depending on other factors at the moment.
 
With the damaged and yellow leaves I was thinking the same thing but I just been cutting some off every couple days because I figured it might cause more stress if I cut them all off at the same time. I try to cut the worse ones off first and then do it again like 2 days later. I also ordered a better PH Meter yesterday just to be sure my current Meter is accurate. When I use my current PH Meter I get a couple different results. I have 3 plants and for each plant I checked the PH in several spots. If my PH Meter is correct then this specific plant has a PH of 6.8 in some spots and 7.1 in other spots. The 6.8 spots were closer to the center. My new Meter will be here tomorrow so I will check the PH again then.
 
Just check the incoming ph of the feed nutes, the out going and the media PH dont mean much, you want to know what the plant id taking in not what its putting out at this stage' On the other hand I am not a soil grower so there may be things I dont know. But when I check my blood sugar its from samples in me not after I am done with them
 
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