Plants yellowing and curling HELP PLEASE !!!

[temp321]

as the title says my plants leaves are all turning yellow and getting brown spots they have just finished there 1st week of 12/12
they are 4 weeks old in total.

im running a 600w hps in my tent i have 5 plants the light is about 3 feet above the plants.

The temp is 81F in the day and the humidity is about 40 %

i water every 2 days giving them 200ml each is this not enough ??

the worst one really looks like its dying please help is there anyway i can save it~???

The pics below are of the worst plant the rest are not as bad but seem like they are going to be going that way.

 

[lahadaextranjera]

They look hungry and the water/food amount goes up according to the plant size. If they are quite dry now I would fully water with 1/4 strength food until you get a run-off. Check the run off PH. Lights are too high up - 600w = 40-60 cms away from canopy.

 

[^Slanty]

What type of medium are you using? By the size of those pots, 200ml is nowhere near enough! You should be soaking the entire medium and then let it dry out 90+% until you feed again, again soaking the medium completely. Your roots are more than likely growing upwards at this point in time looking for moisture and food! The plants look hungry!

ps. looking at your pics again and the size of the pots by a guess, I would say you should be using 1.5-2L per feed every 5-8 days depending on medium.

 

[Coho]

Thats potassium def.

 

[scroglodyte]

water by weight of pot, not by calendar.

 

[temp321]

im using coco for a medium and if its potassium def whats should i do about it ?

also what is a run off and how do i get one? sorry for the noob questions

 

[Sm00th0Perat0r]

Your run off is the water that seeps out the bottom of your pot after you water. You need a PPM (parts per million) meter to test. I dont have any experience with coco, but hopefully someone will chime in. Best of luck.

 

[^Slanty]

What type of medium are you using? By the size of those pots, 200ml is nowhere near enough! You should be soaking the entire medium and then let it dry out 90+% until you feed again, again soaking the medium completely. Your roots are more than likely growing upwards at this point in time looking for moisture and food! The plants look hungry!

ps. looking at your pics again and the size of the pots by a guess, I would say you should be using 1.5-2L per feed every 5-8 days depending on medium.

im using coco for a medium and if its potassium def whats should i do about it ?

also what is a run off and how do i get one? sorry for the noob questions

You need to see water coming out the bottom of your pot when you water. What type of nutrients are you using as well? What has your feed schedule been up til now?

Seems how you are using coco, you should only need to feed once a week more than likely. Before you water, pick up each pot as they are really dry right now due to lack of watering. Once you fully water your pots, pick them up to get an idea of how heavy they are. Then you will be able to judge once the pot has dried up and you will need to water again.(it will take a while in coco)

 

[temp321]

I have been using this starter pack ---> http://www.hesistore.com/acatalog/Hesi_nutrients.html

I have been mixing the nutrients into a litre of water and watering every 2 days. is this not the way to do it? as this is my first grow and i feel like im doing alot of things wrong. I will pick up a PPM asap. Also another question on my mind is will this stress that the plants are under cause them to hermie? they are lemon skunk fems. Is it looking like im going to have to start again from scratch ? thanks for all the help guys

 

[temp321]

This is one of the other plants that is not as bad the leaves arent that yellow it is just the flash off my camera. i wa sjust wondering can you get an idea from this if these look about right for 4 weeks old from seed plants? they have done 3 weeks veg and a week in 12/12 ...


also i know the pics not great but casn any of you pros give me an idea whether this looks hermie?

 

[^Slanty]

I personally would leave them in the veg cycle until you get them healthy again. Trying to flower troubled plants is just asking for more issues.

Also, no way to tell sex from pictures that far away. Need to look at the inter-nodal spots to distinguish sex.

 

[Zoltan44x]

You are probably making the same mistake like I did. Give them more water, but not every 2 days in minimal amounts.

Dont think about if it'll hermie or not for now.
Your mission is to make her happy , healthy and flip to flowering when She's ready.

 

[temp321]

I personally would leave them in the veg cycle until you get them healthy again. Trying to flower troubled plants is just asking for more issues.

Also, no way to tell sex from pictures that far away. Need to look at the inter-nodal spots to distinguish sex.

ok so should i just switch back to 24 hours of light then ?? or do i have to go about it in a different way ??

 

[kimish]

Look for mites. Just sayin.

 

[temp321]

will the leaves that are yellow and dried out fall off now ? and what else could this bis ?

I have done all that has been mentioned except for the run off. please does anyhave anymore information or ideas for me ??