What is wrong with my plants? Help

[bobrock]

My plants dont look great at all here is all the info

What Strain is it? Cheese
indica
How Many Plants? 20
veg stage
2 weeks in from clone
indoor
soil
60% coco coir 30% perlite 10% clay balls
20 ltr pots
1x 600w at the moment
it is air cooled got fan that extracts the whole room in around 120 seconds
27 degrees
45-55% RH
dont know PH
2 meter by 2 meter tent
using coca a & b ,Rhizo and superthrive 7ml of A&B 40 ml of rhizo and few drops of superthirve in 10 ltrs of water.

watering ever 2-3 days but i did have them in 1ltr pots for 1 week

 

[Dave Groomer]

Knowing the PH is going to be very important. I would invest in a ph meter or at least some test strips to give you a ball park of where you are at. PH imbalance can lead to nutrient lock out. For soilless medium you want to be around 5.8

Here is a chart to help.

 

[grimmreefer]

Definitely have to get your Ph in order growing in coco.
Mabey back off on the nutes for a little while.

 

[MickFoster]

The pH in coco should be around 5.8. You have pH issues - I use the GH drops to test the pH and it works perfect at a very low cost.

 

[bobrock]

The pH in coco should be around 5.8. You have pH issues - I use the GH drops to test the pH and it works perfect at a very low cost.

I thought it had to be around 6.5 for coco? as it is soil,Thank you

 

[bobrock]

5.8? not 6.5 can you tell me why please.

Thank you

 

[MickFoster]

I thought it had to be around 6.5 for coco? as it is soil,Thank you

You're welcome. There is a world of knowledge on this forum if you look.

 

[Dave Groomer]

Coco is not considered soil. It is a soiless medium with no nutes so it is treated as hydro.

 

[MickFoster]

5.8? not 6.5 can you tell me why please.

Thank you

Supergroomer posted a chart in this thread listing what the proper pH range is for both soil and hydro. Coco is hydro.

 

[Faic]

I think it's because coco is a soiless medium, in that it does not store nutes the way soil does. When you water, it may suspend in the coco mix, but it's not absorbed in the coco like soil absorbs water. So the plant needs the nute/water to be at the right ph vs the ph of nutes in soil.

I'm not a botanist, nor do I grow in coco. But driving past the holidayinn express, that kind of jumped out and stuck to my windshield.

-edit- Ha! late, but most explantitory response! (though I am interested if my hypothesis of why is correct or not ) But Bobrock, what you are going through right now, is exactly what I went through regarding mysterious failing health of my first grow. What you need to do, now that you know the ranges for ph you need, is to make sure at some point, you are feeding at 5.6, not just at 5.8 or more. By the chart, you can see that Mn is locked out above ph of 5.6, and if you don't give the plant some food at 5.6, you will show a Mn deficiency down the road. Mixing your solution to 5.6 every now and then is much easier than trying to match your plant to pictures in a diagnosis thread.

 

[EARTHWALKER]

Coco is the coconut shell ground up, so no soil at all. I've never grown in anything but coco and perlite.
PH for coco is between 5.8 - 6.2 I keep mine to 5.8 because I know some magic will happen and it will spike up to 6 or 6.1 overnight

 

[Emilya Green]

I thought it had to be around 6.5 for coco? as it is soil,Thank you

coco is NOT soil... it has no organics in it to break down against the acids in the water. Everything you get in your nutrients has to be broken down by a slightly more acidic mix than you would use in soil. 5.1 - 6.3 is your range, and the tricky thing about coco is that the pH doesn't drift as much as in many soilless mediums, and you sometimes have to manually drift your pH through the range, watering one time at 5.4 to pick up the micronutrient minerals, and then the next time adjusting to 5.7 to pick up the macro nutrients.

 

[bobrock]

So the ph of my water was 7.4 when i added nutes so i put it down to 5.8 and gave a feed after closer look the main stems are also red i dont thin its gentics

 

[grimmreefer]

Did the leaves stop showing deficiencys?

 

[Surf420This]

Other than getting your ph in order....id lay off the nutes some...lookin a little hot.

 

[Rifleman]

Get your PH correct first, it will cause all kinds of nutrient problems. Save the pics above for future diagnosis. I printed them out , laminated, and keep them in the garden. Good luck.

 

[bobrock]

Here are my plants now still dont look great at all ive phed but did not seem to hellp any other advice please

 

[Rifleman]

How often do you water?

 

[bobrock]

i was just watering from the top every 3-5 days waiting till the top few inch was dry but i bottom fed them around 3 days ago my concern is that they have not grown much at all all the leave dont seem to be growing wide just long and thin and lime green

How often do you water?

 

[Rifleman]

Long thin leaves could just be the strain. Pale green is usually a nitrogen deficiency. I'm not a soil grower so take this with a grain of salt. Hopefully someone else can add their experience. I still think it might be over watered. There has been a lot written about watering by weight when growing in soil. You can search in the forums and find it. Good luck I hope this helps.