Nitrogen deficency? Lost nearly all leaves

[ZKJ]

Hi im having a big problem with nitrogen deficency (i think) i ordered a bottle of nitrogen but another member said just keep using veg nutes.so i canceled order for nitrogen and kept on with veg nutes but it hasnt sorted the issue and getting abit of nute burn on a few leaves.so confused as to just give water and nitrogen problem gets worse.or keep feeding nutes and nute burn gets worse.
Here was plant when problem started

And here isit now after lots of leaf loss

And the amount of lost leaves

Its definitley affected bud growth and worried the rest are going to fall off.as still yellow.here are other plants some have some at bottom which could be because of no light etc but some have some up the plant

Another thing that im thjnking is the biobizz feeding chart recommends 1ml/litre untill end as im using allmix soil.but i getminate in soil so reqiures soaking the soil.which im thinking would wash out some nutes.now if i was using light mix i should be using 4ml/litre.now j know it should always be less then what they say bit thinking as ive soaked soil will i need to use more.2 of the plants didnt germ so had to re seed and soak again.here is feeding chart

I know i made an error of topping and using lst to shorten some plants when having a tall one in tent as now light is real high for the short ones.

 

[Heavily Medicated]

What is the pH of your soil? How about pH of your inputs? How old are your plants? What kind of light and how high? What is your water source? There are definately problems down below, we just need to figure out what and why.

 

[Rev. Green Genes]

There's a good bit of red in the stems and petioles too. Do you have a foliar spray? I'm leaning towards deficiency of calmag and N.

We need the pH too know if it is lockout or deficiency.
What changed in the environment right before this occurred? they look like they have been well cared for till this happened.

Also, what is your humidity level? is it over 60? last time I had lots of yellow leaves fall out it was mold. I don't see that here, but it made me wince.

 

[Journey Man]

Im seeing the same thing as you @green genes. Had this happen to me, and was caused by a wrong ph and also a lack of calmag. Looks exactly the same so im pretty sure.

Agree with the aboves, check the Ph first of all.

You are in good hands but one more input pointing in the same direction just confirms what Heavily Medicated and green genes has stated.

 

[ZKJ]

What is the pH of your soil? How about pH of your inputs? How old are your plants? What kind of light and how high? What is your water source? There are definately problems down below, we just need to figure out what and why.

hi
Not sure about soil,ph of feed 6.5,not exact sure of age lol as wanted to get the 8 wreks out of my head and just grow untill done.so lost count of age,water is grom tap which i leave in open container for 48hours to evaporate stuff,led panel 600w mars hydo

 

[ZKJ]

There's a good bit of red in the stems and petioles too. Do you have a foliar spray? I'm leaning towards deficiency of calmag and N.

We need the pH too know if it is lockout or deficiency.
What changed in the environment right before this occurred? they look like they have been well cared for till this happened.

Also, what is your humidity level? is it over 60? last time I had lots of yellow leaves fall out it was mold. I don't see that here, but it made me wince.

Hi
Not much changed.the only change is 10°c when light is off.i tried bying heater for that but makes not much differnce.the humidity is 25% at lowest and max 50-55%,ph is always around 6.5 sometimes 6.4.and was going to buy some calmag but have heard if using tap water it has it in already?

 

[ZKJ]

Im seeing the same thing as you @green genes. Had this happen to me, and was caused by a wrong ph and also a lack of calmag. Looks exactly the same so im pretty sure.

Agree with the aboves, check the Ph first of all.

You are in good hands but one more input pointing in the same direction just confirms what Heavily Medicated and green genes has stated.

Thanks ill order some calmag and a soil ph tester

 

[Dazed]

Cal/Mg, dolomite lime will sort that but too far gone now.

 

[Waira]

... I think this is partly longer term low nutrition inputs, Biobizz is super mild,... plant has little for reserves stored for when she needs as a larger and more mature plant,... symptoms are both N and P defc.... cooler temps make matters worse, and that 25% RH is not good either... is that lights-on RH%? .... I would consider getting a PK booster, and a micronutrient supplement as well,...
Get the Accurate 8 soil pH probe mate- (Control Wizard), only one of that type that's accurate enough for good in-pot pH readings,... adjusting water/nutes before putting in is wise, but once in there, there are several other influencing factors that can cause pH to drift off acceptable range,....
..dolomite is best applied before planting, in as fine a form as you can get,.. granular is too slow to break down and get working,.. dolomite is the slowest acting form of limes, because of it's slightly different chemistry,... and if it need it at all will depend on your soil/soilless specifics, water, and nutes,.. too much will cause the pH to drift up close to 7.0, and fight strongly against adjusting downward!