Nute or ph problem ?

[crocop676]

Ok, this is my first grow and I'm not too sure what's happening to the babies. Here's a few details

19 days old since seed(all autoflowering) in a 24*45*65 tent
400W HPS, about a foot away from them, not burning (did the hand test)
Watered only once, runoff pH was 7.0, which is weird because the soil pH is 6.6 and the water was 6.5
Pots are 1 gal (transplanted into them about a week ago, they did just fine)
Soil is organic with no time released ferts
Ventilation and air movement are ok
Temperature 77-87 mostly around 83
No idea about the EC, humidity and ppm but they seed to be doing ok as seedlings
Never fed them any nutes (that's why I'm guessing it's a nute deficiency)

Ok, now the weird thing is that some are just fine, some have yellowing of the old leaves starting from the tips and going towards the stem, some have yellowing of the old leaves everywhere, some have yellowing of the new growing leaves just at the tips etc so I'm getting a bit confused here..


http://postimage.org/image/1gdjzia1w/

 

[Darth Fader]

You might have more than one condition, but the first 2 pics are clearly a Mg deficiency. Try a foliar spray w Epsom Salts and add it to your water as well. Not sure what the recommended levels are, but I've done foliar at 80ppm and around half of that for everyday feeding.

 

[Core]

ok first up....its ya first grow so don't freak out yet.....also don't go follow every advise onhere coz that could trow up some troubles....you've given good info but not very complete...its hard to say anything with this small amount of information.fill out the infirmary questioneer ...soil brand , nutes,times you feed and soforth this way you have the bigger picture and it easyer to make some sort of conclusion

 

[crocop676]

Hey and thanks for the answers. Here's some more details

19 days old since seed(all autoflowering) in a 24*45*65 tent
400W HPS, about a foot away from them, not burning (did the hand test)
When last watered (tap water) pH was 7.0, which is weird because the soil pH is 6.6 and the water was 6.5
Pots are 1 gal (transplanted into them about a week ago, they did just fine)
Soil is organic with no time released ferts
Ventilation and air movement are ok
Temperature 77-87 mostly around 83
No idea about the EC, humidity and ppm but they seed to be doing ok as seedlings
Never fed them any nutes (that's why I'm guessing it's a nute deficiency)

Well I only watered them twice in 19 days (since seed)
They were put in 1/2 gallon pots from seed, then day 11 transplanted into 1 gal, didn't notice anything bad goi
The 7.0 pH was measured with a digital pH meter, checked and rechecked
Haven't got something to measure RH, TDS, PPM with
The bulb is 400 HPS, has a 5 inch cool tube, tied up to a 165 CFM fan, active exhaust
Passive intake, another oscilating fan to blow the air, aimed at the bulb
Don't know about the hard/soft water, haven't got something to measure it with
No training or other things, no chemicals

 

[Core]

heya mate...still like to know some Q's if ya don't mind..again, its not complete.
like to know the brand or mixup of ya soil and also how you measured the soil's ph because if thats not done correctly or if its measured with a cheap meter then we are basing this on a wrong PH lvl..i'm telling this because when you water the soil with 6.5 and the runoff comes tru at 7, it might be a indicator that you may have a ph problem
7 is realy not good for the intake of nutrients ....6.5 is max

 

[Stress_test]

The plants look nice but are getting hungry. Feed em.

If your soil Ph is 6.5 then set your water to 6.5 and you'll be good, plants will love it.
First time around with nutes it will be tough to monitor the Ph of RO, but after a couple of feedings you can track uptake by checking RO, as long as it always goes do from the original 6.5 then your plants are uptaking.
If it starts creeping up closer to the input water Ph then you will need to trim back on nutes or balance cal/mag.

For now just feed em, they looks nice.

 

[ProfGerbik]

i noticed you said you use tap water? do you filter this before you use it? also if using tap you need to let the water sit for 24 hours before you use it as to let the chlorine evaporate.

if you are using straight tap this very well could be the source of your problem as most tap is pretty hard and can easily lock out nutrients if not filtered at least.

another thing i notice is a very common problem i see a lot of new growers do is growing plants that are too big for their pots, im not sure if you planned on transplanting again but the more you transplant the more stress you put on a plant and the more potentially can go wrong. so you should at least use 2 gallon pots for a final transplant.

most soil lose their potential after being drained, so its necessary to start adding nutes after a couple weeks.

 

[ProfGerbik]

for future reference here is a simple guide to many plant symptoms

http://growweedeasy.com/marijuana-symptoms

 

[Stress_test]

i noticed you said you use tap water? do you filter this before you use it? also if using tap you need to let the water sit for 24 hours before you use it as to let the chlorine evaporate.

if you are using straight tap this very well could be the source of your problem as most tap is pretty hard and can easily lock out nutrients if not filtered at least.

another thing i notice is a very common problem i see a lot of new growers do is growing plants that are too big for their pots, im not sure if you planned on transplanting again but the more you transplant the more stress you put on a plant and the more potentially can go wrong. so you should at least use 2 gallon pots for a final transplant.

most soil lose their potential after being drained, so its necessary to start adding nutes after a couple weeks.

Did you read the post explaining the problem and look at the pictures?

Cause I did and from looking at the pictures I see some beautiful looking plants that are 19 days old from seed and are ready to start receiving some nutrients.
The grower is doing a fantastic job with everything else so far. Give em some food and keep the Ph between 6 and 7. Roots grow better during veg if the Ph is on the lower side of 6...

 

[crocop676]

Hi guys, sorry for the big delay, been so busy with work these days.

To answer your questions:

I use a digital pH tester to test the water, it seems ok but I will recalibrate it today
I use tap water, and I let it stay AT LEAST 24 hours. Most of the times it's a couple of days, could that be a problem?

Thanks for your help!

 

[Core]

well them soils are realy ph balanced....so now i want to know if you used the all-mix or the light- mix but i think you have the heavyer one

 

[crocop676]

Another thing which I forgot to add. When first fill the bucket with water, the pH is about 8.0-8.1...then if I let it evaportate it climbs up to 8.4-8.5. Now I've read that's the alkalinity of the water and it will always happen, but I've never heard of it before. Is it something to worry about?

 

[Core]

no its notting to worrie about...you don't even need to do that in every case..
but that aside ....i'll add my

you have transplanted into a very rich/hot soil....that means it is high in nutrients....and only good for big plants that need to flower....the plants are just adjusting to the new feeding regime wich will be quite high right now because they are quite small....
i will advise u to lower your PH lvl to 6.3 - 6.5 and water with 20% runoff (measured with a good calibrated meter)
and i aslo advise 2 NOT feed it for a couple of weeks....BIg plants can go tru a whole flowerstage on this kind of soil....

ohw and next time you start a seedlings, clones ,buy a Light mix and start in that afterwards repot into the All mix and then flower out..

 

[crocop676]

Now, since they are auto's and the site I bought them from says they finish in max 70 days, would that mean I don't have to feed them at all till the end?

One more question, if I were to do it again, after how long should I transplant them from light to all mix?

Thanks again man you're a star

 

[crocop676]

Ok, just watered with 5.9 water and the runoff was 6.5.

 

[Core]

dude can't you read ...6.5 not 5.9 whats that all about....???.?????????........ don't fuck m up willingly mate .....

well use the small pot like 1 or 2 liters and when the roots are fully grown in that pot ..transplant.....but got too be carefull with auto flowering specimens....if they go straight into flower its better to use a big pot from the instant go....to get'm big

 

[crocop676]

Oh I thought u meant I should aim for a runoff of 6.5.
If I had watered with 6.5, the runoff would be 7.0 or something, so I thought lower it down a bit..

Apart from that, what do you think, should I feed them till I harvest (They've got like 50 days left).
A little update: some of the tips are turning yellow and pointing straight down

 

[Core]

yes you can lower the ph but you should not go under the recommended nutrient uptake lvl's 6-2 to 6-7...you can't go presume that your runoff will be higher...you need to measure that actually!....normally if you poor 6.5 in it will come out like that...if not, your soil is out of wack or too wet ect.....


as for the plant feeding the whole time on the soil...I can't say for shure !it is doubtfull in one gallon pot..but if she needs anything to feed on, down the road ,that is up to you to try and find the time to do so.....

 

[crocop676]

Ok man thanks alot. Every time I watered I was thinking to keep the RUNOFF ph in the recommended range (6.3-6.8 or smth), so I even watered with 5.5.

From now, 6.5 ph'd water. Babies doing really good some of the leaves back to green and getting really bushy.

Thanks again man

 

[crocop676]

Ok, for most of the babies, the first set of leaves (right above cotyledons) is now yellow. Should I still worry about N deficiency?http://img231.imageshack.us/i/22062011755.jpg/