Nute burn, deficiency or what?

[Tinder]

My two plants have same symptoms. They had nitrogen deficiency about few weeks ago and that has been corrected. But now, new troubles are on their way. As you can see from pictures lower leafs are turning yellow. Have i overfed them, is it deficiency or what?

SOIL

How long has this problem been going on? Few days.
What STRAIN are you growing? Feminized Northern Lights.
What was the establishing technique? (seed or clone?) Seed.
What is the age of your plants? 6 weeks.
How long have they been in the soil mixture they are in now? 4 weeks.
How Tall are the plants? Other is 25cm and other is 37cm. I have 2 plants.
What PHASE (seedling, vegetative or flower) are the plants in? Vegetative.
What Technique are you using? (SOG, SCROG etc) None.
What size pots are you using? (Include how many subjects to pot) 10 litres pots. 1 plant/pot.
What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?) Soil itself is ok. Its bought from market.
What Nutrient's are you using? Gro, Micro and Bloom.
How much of each nutrient are you using with how much water? *Knowing the brand is very helpful* Gro 7ml, Micro 7ml and bloom 7ml in 10 litres of water. Im using GHE Flora series.
How often are you feeding? Every 4th day.
If flowering, when did you switch over to using Bloom nutrients? Plants are in vegetative phase.
What order are you mixing your nutrients? (example: veg nutes 1st, bloom 2nd ect) Veg, Micro, Bloom.
What is the pH of the "RUN-OFF"? pH is ok.
What method of pH test was administered? Using Strips? pH pen? Drop test.
How often are you watering? Every second day.
When was your last feeding and how often are you feeding? 4 days ago. I feed every 4th day.
What size bulb are you using? 150W HPS.
What is the distance to the canopy? 15-20cm.
What is your RH Factor? (Relative Humidity) Unknown
What is the canopy temperature? 28 Celsius.
What is the Day/Night Temp? (Include fluctuation range) Temperatures are ok.
What is the current Air Flow? (cfm etc.) 150cfm.
Tell us about your ventilation, intake exhaust and when its running and not running ? Intake is 150 cfm and its off at nights.
Is the fan blowing directly at plants? Yes.
Is the grow substrate constantly wet or moist? Moist.
Is your water HARD or SOFT? Im using tap water.
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water? Tap water with lowered pH.
Are you using water from a water softener? No
Has plant been recently pruned, cloned or pinched? I made a FIM few weeks ago.
Have any pest chemicals been used? If so what and when? No.
Are plant's infected with pest's? No.

 

[bombadil.360]

hello,

this is what I see: you do not say whether your soil has anything in the mix that helps it drain i.e: either coco, perlite, sand, etc...

it looks like over-watering plus a packed soil.

also, 28 Celsius is hot, specially for indoor imo. if you could lower those temps to at least 25 C it would be much better.

that is my take, I could be wrong.

good luck!

 

[Tinder]

Thanks for your response. Soil has mix of 25% of gravel.

 

[Snype]

IMO the first thing that stands out to me is that you are are overfeeding if you are nuting every 4th day. Do you happen do know the brand of soil that you are using? Are there any time released ferts in your soil? So you're mixing VEG, MICRO and BLOOM all together? What are you lowering your pH to? When you water on the second day, how do you personally know that it needs to be watered? What method do you use to check?

 

[BigTop]

Likely a few issues all at once, but the pics + provided info tell of uptake issues for the plants... at the roots/in the medium.

Do you have a layer of gravel over the soil? I see no soil... and that'l be a big issue with any help/direction you might take...

You shouldn't really be feeding soil that often with nutes, esp at 7/7/7, esp that early in the plant life. Would rec getting a soil-based nute program & backing off the label to 1/3 rate.

If overwatering, which is likely too, then even more issues with the uptake. The crinkling of the leaves (even though spread out level) is a sign that it has/had issues...

The lower, inside leaves... don't worry about the die back as they are the first leaves, done their job, don't get any light anyway + are the ones the plant draws the mobiles from... cut em off & forget about them.


Just seems that a few issues all at once and the plant is showing it on several fronts.


What's your mix/run-off pH? Give or take, or the color of the die...?

 

[Snype]

I see that you say the pH is ok but can you please tell me what you set it at? If you're soil is always moist like you say, then you are also over watering. The way that I tell when I have to water my soiled plants is to hand weigh the pots. They should feel about the same weight that they were when you first filled up the pot with soil before you added any water. With the stage that you are at with the GH nutes, you do not need the VEG anymore. The MICRO has plenty of N for your plants. I personally like to ask a lot of questions first so that I have a good understanding of everything that is going on before I tell you what I would do if they were my plants, so I'm just thinking of everything else and I will wait for your response.

 

[Tinder]

The pH is between 6.0 - 7.0. Im using pH test indicator from GHE. It is a drop test.
I always put my finger to soil and check if it is dry for about 2 centimetres. And ive noticed that those plants become very wilted if i dont water them for a few days.
Soil has following values:
N 100mg/Litre
P 60mg/Litre
K 400mg/Litre

 

[Snype]

If your soil already has nutes then you don't need to add more unless you want to try and kill them. Also that's not how you tell if your plants need water. You have to weigh the pot. The top of the soil doesn't mean anything. You got to let your soil dry out.

 

[Snype]

The thing is though I need to know if your nutes are time released.

 

[Tinder]

The thing is though I need to know if your nutes are time released.

English is not my mothers language so im sorry but i dont understand what is "time released nutes"

 

[Snype]

Time released is when your soil has nutrients in it that slowly release over a period of time.

 

[Tinder]

No they are not. Im only giving GHE Flora nutrients. I dont give them anything else.

 

[Snype]

Alright let me see if I have any more questions for you and then I'll give you some steps to do plus a new feeding schedule for you. Maybe about 30 minutes.

 

[Snype]

Tinder, I have a few things to take care of but here's what I would like you to do for now. Let your soil dry out to the point of which it is supposed to. The only way to do is to hand weigh the pots. I don't know the quality of your soil because I don't know what brand it is but anyway. Start out by flushing your plants out with pH'd water and try your best to stay in the mid 6's for pH. In soil you can have lockouts at 6.4 and below so it's best to stay above that between 6.5 - 6.7. It would help a lot if I knew the pH of your run-off but you have test strips so it's not too accurate in my opinion. Flush them for at least the next 7 days and later on today I'll come back and take a look through this thread. If you don't hear from be it is because I forgot about you so send me a message.

 

[Tinder]

Ok. Thanks for your effort.