cant figure out which deficiency

[dirtbag22]

hi guys whats up!

i grow ak48 in a cab and ive been having issues from the start. its my first grow in hydro, never ran into probs like this in soil, so im at a loss.. some data:

i run AN gmb at 1/2 strength plus rhino. cannazyme and rhizotonic for the roots.
i change out the reservoire once a week.
new res at ph5.5 and let it drift to about 6.2 before i ph down again. ph rises quite a lot, sometimes as much as 0.5 in 24 hours. res is 50 liters/13 gallons.

temperatures range from 18-27 night/day (C). res temp steady at 20ish.

my tap water is like 60 ppm. i add sensi cal and epsom salt to bring it up to 300. the girls are now at 4th week of flowering, and i have worked the ppms up to a total of 1250 ppm. 1250 - 300 is just under a thousand in nutes, and i dont intend to go any higher.

rh are steady between 45 and 60%. bought a dehuey to manage rh during lights off.

lights are chinese no name LED with approx 87 watts real draw/nom. 300w. keeping the light about 20 inches, a half meter, over the plants. got some scorching at closer to canopy.

so photos..

 

[dirtbag22]

one of the plants looks quite healthy though



but she is like 2 weeks after the others in development. started these from seeds and went 12/12 almost immediately and because i was out of quality weed.

last week of big bud now, going overdrive next weekend.

as you can see in the pictures theres this thing going on around the edges of the leaves. earlier in the grow i had rusty spots and some necrosis on older leaves, which i diagnosed as being mag def. epsom salt cured that and then this edge thing came along. the very tips of the leaves first turn red and then the leaf starts paling and the red goes from dark, rusty red to a lighter red colour.i figured it might be potassium def due to too high cal and mag levels, so i backed of a bit but the problem persists.

bud development seems pretty normal or slightly below normal. smell is pretty dank, gotta love that

any and all help appreciated guys

take it easy, db

 

[gmanwho]

your tap is 60 ppm, so i believe you should minus 60 ppm, not 300 ppm. cause your adding cal mag to get to 300. looks like k def to me.

rusty spots are usually cal. but cal later can look like other def for sure. looks like k def to me.

when i run cal mag, i start with 5 mill per gal. you added 240 ppm of cal mag, that is quite a bit to start with.

just cause nutrients are in the water doesnt mean the roots are absorbing it. try running 5 mil per gal of cal mag then add you nutes to no more then a 1000ppm an hold there an see what happens..

 

[Bongstar420]

Looks a little over lit to me, but yes, Mg was also a little low. I had it happen in very high red lighting even under cool, fairly low intensities. I would add white light or green and back the fixture off. Sealed cabs can become overlit easily...but hey, I'm just a random moron

View Image

View Image


one of the plants looks quite healthy though

View Image

but she is like 2 weeks after the others in development. started these from seeds and went 12/12 almost immediately and because i was out of quality weed.

last week of big bud now, going overdrive next weekend.

as you can see in the pictures theres this thing going on around the edges of the leaves. earlier in the grow i had rusty spots and some necrosis on older leaves, which i diagnosed as being mag def. epsom salt cured that and then this edge thing came along. the very tips of the leaves first turn red and then the leaf starts paling and the red goes from dark, rusty red to a lighter red colour.i figured it might be potassium def due to too high cal and mag levels, so i backed of a bit but the problem persists.

bud development seems pretty normal or slightly below normal. smell is pretty dank, gotta love that

any and all help appreciated guys

take it easy, db

 

[dirtbag22]

your tap is 60 ppm, so i believe you should minus 60 ppm, not 300 ppm. cause your adding cal mag to get to 300. looks like k def to me.

rusty spots are usually cal. but cal later can look like other def for sure. looks like k def to me.

when i run cal mag, i start with 5 mill per gal. you added 240 ppm of cal mag, that is quite a bit to start with.

just cause nutrients are in the water doesnt mean the roots are absorbing it. try running 5 mil per gal of cal mag then add you nutes to no more then a 1000ppm an hold there an see what happens..

hey thanks gmanwho. i added 50 ml of rhino into 13 gallon so im at like 4 mls/gl. the bitch is that now for some reason the girls stopped feeding. as of yesterday humidity is way down and they arent like spreading the leaves anymore. and ph which has almost shot through the roof earlier is now dropping slightly. man, i have no clue whats going on.
i did dilute to about 1200 which, by my way of ounting, puts me at like 900 ppms. i dont know, i have to do something, thats for sure. maybe dilute even more.

i would sure appreciate if someone else would chime in to, got a feeling that things are going south pretty fazt now...
thanks guys, db

 

[dirtbag22]

Looks a little over lit to me, but yes, Mg was also a little low. I had it happen in very high red lighting even under cool, fairly low intensities. I would add white light or green and back the fixture off. Sealed cabs can become overlit easily...but hey, I'm just a random moron

thanks bongstar, i got the light as high as possible now, think you might be right about over doing the light thing. like i said they stopped feeding and drinking and now the temperatures are going way up. i was steady at like 25-26 C before and now when i lifted the light up i was at like 28.5degrees.

thanks again, db

 

[soil margin]

Looks like nute lockout, mild to moderate case. I would flush with PH water for a week. What's your typical feeding schedule?

 

[dirtbag22]

hey what up soil margin

im in rdwc - forgot to write that. ive been watering down the solution for two days and finally theyve started feeding again. whats got me a bit confused though is that the hubger strike czme on xo abruptly. guess it goes to show that theres a treshold and i was probably right at it last res.

what i originally asked for help for though was those funky looking edges to the leaves. the leaves themselves are quite pale green in normal light so i figured id ramp it up a bit. yeah, maybe some mind of lo k out. been giving them quiteheavy doses of epsom due to rusty leaves. think it might be that?

 

[stoned-trout]

yeehaw

 

[soil margin]

yeah, maybe some mind of lo k out. been giving them quite heavy doses of epsom due to rusty leaves. think it might be that?

Hey dirt. From what you've posted in this thread it sounds to me like you went a little overboard on the calcium and that's whats locking out the K and maybe some mag or sulfur as well. Those leaves look like they are suffering from a couple deficiencies.

 

[PoweredByLove]

i can't really tell with these yellowed out colored pics. can you take some under normal white lighting, or a flash pic with the lights off.

why you got your pH so low? 5.5? that's hella low even for hydro.

 

[redlaser]

hi guys whats up!

i grow ak48 in a cab and ive been having issues from the start. its my first grow in hydro, never ran into probs like this in soil, so im at a loss.. some data:

i run AN gmb at 1/2 strength plus rhino. cannazyme and rhizotonic for the roots.
i change out the reservoire once a week.
new res at ph5.5 and let it drift to about 6.2 before i ph down again. ph rises quite a lot, sometimes as much as 0.5 in 24 hours. res is 50 liters/13 gallons.

temperatures range from 18-27 night/day (C). res temp steady at 20ish.

my tap water is like 60 ppm. i add sensi cal and epsom salt to bring it up to 300. the girls are now at 4th week of flowering, and i have worked the ppms up to a total of 1250 ppm. 1250 - 300 is just under a thousand in nutes, and i dont intend to go any higher.

rh are steady between 45 and 60%. bought a dehuey to manage rh during lights off.

lights are chinese no name LED with approx 87 watts real draw/nom. 300w. keeping the light about 20 inches, a half meter, over the plants. got some scorching at closer to canopy.

so photos..

[URL=https://www.icmag.com/ic/picture.php?albumid=67000&pictureid=1592151&thumb=1]View Image[/url]

[URL=https://www.icmag.com/ic/picture.php?albumid=67000&pictureid=1592152&thumb=1]View Image[/url]

[URL=https://www.icmag.com/ic/picture.php?albumid=67000&pictureid=1592153&thumb=1]View Image[/url]

[URL=https://www.icmag.com/ic/picture.php?albumid=67000&pictureid=1592154&thumb=1]View Image[/url]

[URL=https://www.icmag.com/ic/picture.php?albumid=67000&pictureid=1592162&thumb=1]View Image[/url]

I've been dealing with a very similar issue at a newer place. The first picture is most like my plants except mine are farther along in their decline. Thought it was a potassium overage or underdose, maybe calcium or magnesium as well. Happens in new pro-mix with Pure blend pro fert at 3/4 strength as well as amended organic soil with my own castings. Happening in my vegetable garden all last year as well. Older leaves get chlorotic edges which go necrotic, eventually 3/4 of the leaves will get that way. Foliars seem to have no effect. Overall the plants have a dry look, a slight grayish cast to the leaves. very little new growth once 1/4 of the leaves are affected. So FINALLY, I get a water test which should have been done before and it's reasonable except for chloride. I've got 379mg. per liter of chloride, which is beyond severe. Reverse osmosis or distillation is needed to remove most of the chloride. This water is from a 375 ft. deep well at about 3,500 ft elevation, so to me its a little surprising that its an issue. Chloride anions regulate potassium uptake, so it seems to explain the symptoms I am seeing anyway.