Major problem

[growman]

Hey guys,

Im into my second week on a hydro system and i am having a problem with the plants.

Yellowing of the leaves on the tips and on some it looks like a nut burn through the entire leaf. This has just happened in the last few days.

I am running a ph of around 6 which has been fluctuating .2 either way.
I was running a EC of 1.3 but have since done a dump and its sitting at 1.1 now.

Attached is a copy of pics

I have noticed on 3 of them that there is a bit of what looks like algue around the bottom of the stalk and into the rockwool.

Any help will be much appreciated.

[Weedhound]

Those do look like they have an issue. I do my measuring via tds so cannot help you with that....what kind of nutes are you using?

[growman]

Im using Growzilla premix.

Just gone and brought some algue cure hope that sorts it out.

[Weedhound]

Good luck....sorry I couldn't be more help.... :(

[growman]

Hey all good, im sure ill be back if it doesnt work.

ez

[tomasinho]

How close is the light? How big is the light? How how is it getting in there (right next to the plants)?

[tomasinho]

It almost looks like nute burn - but It could be a heat issue as well. There are also some spots that look like mold. You might have more than one problem there. If you post pics taken under a flouro instead of HPS its easier to diagnose. Also - please post temps, light size and distance..etc. These problems can usually be figured out.

[Weedhound]

Tom knows the score....growman....he rocks. :thumbsup:

[growman]

Ok, the light is 400 HPS. I have it at about 250mm away from plants. The 2 plants that are actually mainly affected are 300mm away. Temp in the room is roughly 23 deg. Fan is on the light to keep cool.

The water temp is 23 deg.

EC is exactly 1.2

Just before this happened i was feeding for 15 minutes once an hour and not feeding at night.
I have since moved feeding to 15 minutes every 4 hours now.
I dumped the water yesterday as originally it was reading an EC of 1.4 and i had Silikamajic Silica in the mix.

Should i dump the water again and run no nutrients at all for a week??


I had the water feeder of each plant going directly onto the rockwool but have now moved them all slightly away so only the root area will get feed.

I will take some photos now of set etc

[growman]

here's some more pics

[growman]

Sorry i put 400w its actually 600w HPS

[tomasinho]

Ok. I think that your light is a little too close and your EC might be a little too high. Move your light back - about 18 inches from the top of the plants. Little plants like that get heat stressed easily.A 600W bulb makes a lot of local heat. While it may be 23 degrees in the room, under the light it is much hotter. Try checking the temp right at the top of the plants and you will see what I mean. I also suggest running clean water in the system for 2-3 days and then resume feeding at .8-1 EC. When the plants get healthier you can bring the E.C. slowly back up. The plants do not need to be feed every hour - you were right to reduce the amount of times they are being fed - good job! They really only need about 3-4 feedings a day at that size. good luck!

[growman]

Ok ill dump and do fresh water for a few days.

I have noticed that the PH has been going up a lot in the last few days. Like .5 min in a 24 hour period. Any ideas why that could be.

Thanks

[stinkyattic]

Well what about your pH?

I see both burns and what looks like a possible deficiency- I am no dro pro but those pics scream lockout to me.

[growman]

Yup you are right it was a mean lockout. Flushed them for a week on just water. Problem solved now and there moving along nicely.