Problem with 2 strains. Critical Kush and White russian/Kush

I have been growing 2 strains of marijuana under a medical license. We recived a bunch of clones just after our Critical Kush seeds were germinated.
long story short, 4 clones made it, the other 11 are Critical kush (seedlings)
medium is Sunshine mix #4
in tupperware totes (72L maybe?)
4 plants under each 1000w hps bulbs. will be 2 per bulb during flower. with 1 left for a scrog test I am doing.

The 4 clones are exhibiting problems, which started on the top leaves. they are canoeing and have lighert green areas between veins.

the first 4 seedlings I transplanted into totes are doing fine, aside from one my partner flushed, but has since sprung back to health and is catching up to the other 3.

The other 7 were exhibiting fert burn and my partner on advise flushed the soil. They have not sprung back as of yet. but I have now transplanted them into totes.

Problem #1
Clones: What does these signs indicate? should I trim the affected leaves, or are they good indicators if the problem is resolved? (100_662[1].jpg 100_663[1].jpg clone1.jpg)

Problem #2
First 4 seedlings. as you can see, the first 4 seedlings are massive!. I have never seen plants grow with this girth. my issue is, the top fan leaves are sooo big that they block all light to the sprouts coming off the bottom. Should I cut the fan leaf to give it more light? I would usually just cut the srout because it is on the bottom and would only become wispy bud anyways, but the stalk on the SPROUT the first leaf up is almost the size of a PENCIL already!! so I am thinking maybe it will be big enough to reach the top of the canopy? if not, should I prune the new sprout?

Problem #3
The last 7 were flushed. and my knowledge of sunshine mix is that is does not contain natural nutriance. so if you flush it, you can pretty much starve the plant. is this correct? these plants are all pale in color, and bottom leave are yellowish as you can see. am I correct in assuming the flushing had a negative effect? I since gave them 1/4 dose of my advanced nut regimine.


Any suggestions would be greatly appreciated!!

nobody has any suggestions?

not 1 person can comment on these pics??

#6 and 7 look like you have heat stress going on. But...hard to tell under the light. Some deficiencies cause brow spots which can be masked by the orange HPS glow.

The First thing I do when solving nutrient problems is check the soil ph. What ph are you mixing your nutes to?

I never trim leaves personally until about the first and second week for flower. Then I will gradually remove all the small branches at the base of the plant and lollipop a bit. Even though they are at the bottom they are still absorbing some light and helping growth. I personally don't believe in the big leave shading the smaller one below so I let the plant shed them how and when she wants to.

I usually ph the nutes to 6.3. the run off seems to come in at 5.8-6.0.

the clones did get a little burnt when the seedlings did, so there is a leaf on the lower part of the plant that has a few brown spots, none of the new growth since has any spots on them tho.

I would say heat stress then for the cupping. And after a flush I go back to normal strength fert usually if they were on full strength before. I skip the 1/4 str. In fact, the last gallon I use to flush is usually my fert mix.

There are two kinds of sunshine mix . The advanced has some fertilizer in it as well as lime. The regular is just peat moss and perlite with a wetting agent I believe.

Testing run off has it's pros and cons associated with it. There are usually a lot of unknowns in the soil so I don't personally do it. I just soil probe the soil.

so what does the soil probe do, and how do you do it? I was against flushing the plants because my own logic told me that runoff has other dissolved solids that would be raising the ppm of the runoff. but my partner was really concerned so he flushed them from 1300-1600 down to 200-400. which seemed low to me, and to the plants apparently, as they didnt look well for the next few days.

on the clones, where you say it is heat stress, what distance should the light be, and what temp should the top of the plant be to avoid this. and should I leave the affected leaves as an indicator that the problem is resolved?

Looks a little over or underwaterd, like the post above said heat stress could be causing the plant to lose more water then its root system can.

havoc902 said:

so what does the soil probe do, and how do you do it? I was against flushing the plants because my own logic told me that runoff has other dissolved solids that would be raising the ppm of the runoff. but my partner was really concerned so he flushed them from 1300-1600 down to 200-400. which seemed low to me, and to the plants apparently, as they didnt look well for the next few days.

on the clones, where you say it is heat stress, what distance should the light be, and what temp should the top of the plant be to avoid this. and should I leave the affected leaves as an indicator that the problem is resolved?

Click to expand...

The soil probe just measures PH in the soil. You want about 6.2-6.5 for a soiless mix. I try to avoid flushing. It can be very stressful on the plant if done improperly. Unless it is severe burn, I will try to migrate the PH down or water a bit more to solve light burn. Stripping the soil of nutrients on a plant can do more harm than good usually.

Your light should be about 18" if 1kw 14" for 600w etc. If they are in hoods with venting, then you can get closer. If you have really good air circulation in the room, a bit closer. Put your hand under the light at the tip of your plant, if it feels hot back the light off. Leave the leaves they will return to normal.

All the lights are 24" away. and the lights are in cooltubes. the hosing and fans are not hooked up yet, but they still disperse heat.
I turned my ballasts down to 600w today. will leave them at that for now see if their is any improvements. I was also told this could be Mn def? anyone know a good fert with high Mn for a foliar spray?