Quote Originally Posted by Zandor
50% is fine for most people. If you have AC and a closed room with CO² then more RH is great.

As you finish the last few weeks you need to get it down too that is to high for flower. To finish you should be aroud 25% - 30% and that will keep mold from getting a hold.

You need to have plenty of fresh air moving around your plants at all times.

But I would say you lower then expected yield may be something else.

What nutrients are you feeding them?

What supplements are you using?

What type of water?

How long do you veg them before you switch to 12/12?

What type of lights are you using?

You may want to check out my show if you are having problems the odds are in your favor that I already address most of your questions.
Hi Zandor thanks for reply

How we are growing and what we are using.

We are using two 400w hps lights in a plastic green house approx 6ft by 4.5ft. the greenhouse is lined with mylar. The door is left open all day as they get too hot otherwise, generally sit at about 76 degrees. We have two bathroom fans cut into the roof to take away the hot air and an oscillating fan blowing on them when the lights are on.

I take my own cuttings, bring them on in an incubator and once roots are established (approx 2 weeks) move them into hydroponics with rockwool cubes giving them a feed level of 6 for the first week then up to 18 and a ph level of 5.5 to 6.2 with it as near to 5.8 as I can get and 18 hrs of light . this stage lasts about 3 weeks.they are fed with ionic grow at this stage and reach approx 2.5 â?? 3 ft.

I then move them onto 12 hrs of light and feed them on ionic bloom (though changed to vega flours this time) and also using the ionic boost during this stage. I have an air stone in with them at this stage to add air to the roots.

I use tap water in my hydroponics, use the gro tanks with water washing over them 24/7.



Cheers NCM
Nightcrewman Reviewed by Nightcrewman on . Humidity Hi just how important is humidity to the end result. we are struggling to keep humidity in the grow tent up its normaly about 50% but I assume this is too low. Could this be the reason our crop weight has been so bad lately. The tent is 6X4X6 ft and the temprature is around 75 degrees. we have 5 plants in at the moment Any advice welcome NCM Rating: 5