what is wrong with theese plants in coco?

where did my post go?

i wrote so much and it all disappeared. i cant be bothered:-O

what is wrong with theese plants?

coco stealing calcium? releasing potassium and sodium?
ph problems? heat? light?
root rot?

im clueless. i now flushed these 3x1.5L times with distilled water and runoff is 0.2 EC and ph 7.

strain is wedding glue auto 2.5 weeks

ask me for more info as my previous post with alot just disappeared.

New growth looks good. Continue feeding them daily with proper ph and EC and they will turn around quickly

Never, ever run plain water through.........it fucks up the cation exchange capacity.
Like @bk78 said........feed daily to run off with a pH around 6.0 and things will straighten out.

okey thx!
i just flush them right now so i could start over with my new nutrient blend. and i noticed this morning that the ph of the new res was 4.2!! it had floated from 6.0 measured both from ph pen and drops mesure to 4.2 in the res and the measure cup i had the meter in during night showed 5. i let the res sit for like 5 hours before i watered with it. and the plant to the right got these nasty yellow leafs during night. could the microbes i added lowered the ph so much? or wasnt it properly buffered as i added both phosphorus acid for ph down and potassium silicate as ph up. thing is the plants have been struggling since born with this behavior. new growth coming out fine but with small yellowing tip, then the second newest leaves started to yellow more from the tip just like this. could the wrong ph do this over night? i have alot of experience with hydro but not coco. never seen anything this bad. and i didnt knew about CEC sites realizing i bout ugro pure perlite which is just pre-buffered with calcium nitrate to 1.5 EC. but i did have a faulty ph pen upon til a week ago and i think i fed them way to low ph since start. but that dont explain why my test plants wich is finola hemp also shows this symtoms from seedling, and they only got water with the same coco / cow manure blend 80/20 but i think i fed them tap water 0.4 EC and 8 ph. guerilla glue auto coming fine though also in the coco / cow manure mix but they got fed ph corrected to 6ish tapwater. i didnt compress that medium much either, less prone to overwatering i figured wich i think is my case, overwatering and ph fluctuations/totally wrong. i did water with biobizz coco mix schedule with added molasses and fish mix ending up in 1.5-1.6 EC also 6 ph (as i thought) but its was 4.2 in the morning. could it have change like this in the medium also? its a ph fuck up? as the molasses i added raised a lot to EC and i tested another plant 1 week ago with 1.8 full streght coco mix thought it would go. they didnt show nutrient burn and looked pale green instead deep green for being a overdosed dominant indica hybrid.

small ones are gorilla glue auto. they dont show any yellowing and are lush green. sorry only have HPS as light. but they seem fine. they got ph corrected water. once. almost a week old.
second one is the team. mostly wedding glue auto but three feminized wedding glue and one sunshine sherbert (cant be seen) to be cloned.
the non autos seems healthier. cuz they can take more nutrients? wish itwould be the other way cuz the autos dont have time to rest. i have no experience with autos indoor only growing some finola hemp fields and have never seen this yellowing there. last pic is finola.

cant post the picture again. problems site says.
so have a look in the first post i did instead.

thx for the feedback
cheers

Plants shouldn't be looking that pale straight out of the gate. I'd reassess your basics because they are already struggling during what should be one of their most vigorous periods. Plants shouldn't need food for around the first 10 days. Too much water and especially nutrients can easily kill seedlings. If you are PHing water within range and your medium and environmental conditions are within range, your plants should be fine. Always focus on writing down what you do notice. The issue is happening early in the grow. Growth is lime green and damage starts from the tips. The damage appears to begin at the bottom of the plant and spreads upwards. I'm going with PH issues as not many other things could be hurting those seedlings so early in the grow.

RuggedWombat said:

Plants shouldn't be looking that pale straight out of the gate. I'd reassess your basics because they are already struggling during what should be one of their most vigorous periods. Plants shouldn't need food for around the first 10 days. Too much water and especially nutrients can easily kill seedlings. If you are PHing water within range and your medium and environmental conditions are within range, your plants should be fine. Always focus on writing down what you do notice. The issue is happening early in the grow. Growth is lime green and damage starts from the tips. The damage appears to begin at the bottom of the plant and spreads upwards. I'm going with PH issues as not many other things could be hurting those seedlings so early in the grow.

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thx

i did manage to sort it. too much lime in the municipal water. was impossible to manage ph. also 80 ppm sodium which is toxic. bounced back ph to 8.5 within hours. i did try once with 200L and it took 1dl of phospourus acid to bring ph to 5.8. thats a bit to much.

with RO water and DIY calmag it was easy street to provide perfect water-nutrients buffé efery feeding

synergetic said:

thx

i did manage to sort it. too much lime in the municipal water. was impossible to manage ph. also 80 ppm sodium which is toxic. bounced back ph to 8.5 within hours. i did try once with 200L and it took 1dl of phospourus acid to bring ph to 5.8. thats a bit to much.

with RO water and DIY calmag it was easy street to provide perfect water-nutrients buffé efery feeding

Click to expand...

Great to hear brother. I'm probably needing to move toward RO myself. My current girl is super healthy, and yet I still get weird necrotic spots between the veins. The water is naturally 7.8 PH so even PHing the water won't stop the medium from slowly increasing in PH over time. We all have our cross to bear I suppose lol.