Plant leaf turning yellow with burnt tips (HELP)

Hey guys ive been growing 2 plants outdoor this year one of them indica and the other one sativa

Ive got a problem with my sativa plant started from 3 weeks ago were my plant leafs started to become light green all over the plant with burnt curl up tips. From the last 7 days by now the leafs from the bottom started to loose the colour completly and becoming yellow to white and idk whats wrong or how to fix the issue

Gotta say tho i was feeding my plants non liquid nutrient with high nitrogen in it and they both was totaly fine untill i started to feed them non liquid NPK 20-20-20 (cheap one too) then the sativa plant started to get tip burnt after a week or 10 days i think and then started to become light green and yellow out from the bottom
And btw just checked my ph water and it was around ph of 8
Another thing to add is that its been going on really hot days with high himudity for 2-3 months
And im watering them almost everday



Here is my other plant wich is totaly fine in my eyes

Right off I'd say your water PH is too high, in soil I go ~6.3, curious if your using the same water on that nice looking one? Watering everyday could be washing out the nutrients too.

sonnyjim said:

Right off I'd say your water PH is too high, in soil I go ~6.3, curious if your using the same water on that nice looking one? Watering everyday could be washing out the nutrients too.

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Yes im using the same water and nutrient for the nice looking one too but they are different straigns obviously so maybe its only bcz of that

The yellowing one is definitely a mobile nutrient deficiency, pulling from old growth to feed new growth, N, P, K, Mg, Mo, Ni. Hard to believe the nice looking one is liking PH8 water unless your soil is really buffering it, how's the calibration of your PH pen?

sonnyjim said:

The yellowing one is definitely a mobile nutrient deficiency, pulling from old growth to feed new growth, N, P, K, Mg, Mo, Ni. Hard to believe the nice looking one is liking PH8 water, how's the calibration of your PH pen?

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Tbh i dont have a PH pen so i just used those PH paper thingy its not accurate but it should be around PH of 8 as i tested it
And yeah its wierd for me too but gotta say tho some leafs from the very bottom (2-3 small ones) of that healthy looking plant is starting to yellow out but that could be from lacking of light too im guessing

One more thing to add is that im not sure whats my PPM of water is otherwise i would have feed them already boiled water bcz it was around ph of 7 as i tested it but the problem is boiled water has higher PPM level

Nute burn. Stop using fertilizer and flush with ph 6.5 to 7.5

Templetonpeck22 said:

Nute burn. Stop using fertilizer and flush with ph 6.5 to 7.5

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I already flushed both of my plants yesterday bcz i dont want the other one end up like this too
Just flushed for the second time today to make sure there is no nutrient in the soil
But when should i feed them again bcz yellowing leafs from the botting is a sign of lacking nitrogen and im guessing the plant couldnt take up the nitrogen from the soil bcz it was locked out with PK

I'm experiencing the same issue. I'm flushing until they return to normal but I only have 3 weeks left till harvest. I also had low temp area so I adjusted temp to be warmer in area.

Templetonpeck22 said:

I'm experiencing the same issue. I'm flushing until they return to normal but I only have 3 weeks left till harvest. I also had low temp area so I adjusted temp to be warmer in area.

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Mine hasnt started flowering yet so i have a lil bit of time to recover. Im guessing it will start to flower in 3 weeks when the night time becomes around 12 hrs per day

Btw do you think liquid nutrient is better? Maybe i should just feed it nitrogen then start adding PK after a week?

PuriaMK said:

Btw do you think liquid nutrient is better? Maybe i should just feed it nitrogen then start adding PK after a week?

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You should pot it up first, looks to be a pretty big plant in a 2/3 gal container.

Im using the same pot for my other plant wich is growing larger and its at least double size compared to my problematic plant and its totaly fine. Tbh im not sure if the pot size is the issue at this point.

Think about the amount of stress the plant is going through. As you said it's been super hot, and your plants are in small black pots. The root zone is way warmer than it should be and the plant is drying out daily. Sounds like a lot of avoidable stress.

Yea that actually make sence, its a lie if i say i didnt thought about that part but i still think thats not the case here bcz heat stress and and basicly root stress has differens signs than what im experiencing.

My plant looks like it has nitrogen defiency cuz of the light green leafs and yellowing out from the bottom but at the same time it has burnt tips wich means too much nitrogen in most cases and its kinda wierd

Im guessing its bcz of nutrient lock out but i wanna make sure bcz obviously im not expert and it considers as my first time growing (i grew up once before but i didnt pay any attention to it bcz it wasnt in my place so that doesnt really count i think)

I flushed the soil 2 times in the last 2 days and today i fed nutrient to it with PH of around 6 (just lowered the PH with lemon juice)
Gonna see if that fixes the problem