Overwaterd Greenhouse

[FatherEarth]

Ok my soil is dialed in, my environment is lacking a heater that is in the process of being installed. While I was away at a festival for 4 days, my help watered the greenhouse WAAAY too much. The Problem is the plants arent in pots they are in a trench filled with our soil mix. 7 feet wide 2.5-3 feet deep. The plants are well established but showing signs of overwatering. Curling inward and frilly leaf edges. Is there anything I can do to help them out? I tried increasing the temps during the day and the fans are on constantly at night. Ive poked holes in the soil with bamboo sticks to help get some air to the roots, downside being I ripped some roots doing so. I scratched the top layer of soil with a rake to speed drying the top layer, any deeper and Id be destroying lots of root growth. Im hoping if I can get this heater installed and keep the temps around 80 all night it could speed recovery and help the plants suck up the excess and transpire. I really cant afford to lose this crop, any advice is much appreciated. Here are some pics of what Im dealing with....

 

[FatherEarth]

 

[JHerbz]

I don't think theirs anything you can do except let them drink up...


can you remove the plastic to let the sun bake the ground a bit?

 

[FatherEarth]

 

[FatherEarth]

Removing the plastic where Im at wouldnt help much the temps barely get into the 80s occasionally and it rains often. Im in the PNW, in the coastal range. north side of 45th parallel

 

[trichrider]

what are the temps in there? why do you need a heater this time of year?

 

[JHerbz]

Removing the plastic where Im at wouldnt help much the temps barely get into the 80s occasionally and it rains often. Im in the PNW, in the coastal range. north side of 45th parallel

The sun no matter how hot it is outside will dry the soil better then being trapped in a greenhouse where the water evaps and cant even escape the house.

I think its your only option.

 

[FatherEarth]

The temps at night dip down below 60 into the low 50's which makes the RH jump to 85-99... Temps during the day without the fans going get into the high 90s. They are linked to a sentinel controller that kicks on at around 90. The high temp today is going to be around 74 outside...

 

[Granger2]

Air flow during the day will help dry the soil faster. Good luck. -granger

 

[Littleleaf]

That GH looks to long for good air flow,you need to get it moveing more.

Have you thought of passive heating?
You can take old tires and stack them along the edge of the gh,2 or3 high. In the center of the tires use trash bags(3 inside each other to keep them from leaking) and fill them with water and tie shut. The sun will heat them up and will hold it through the night.

IT works!

 

[huligun]

If your trenches are made in clay you could dig relief trenches to take the water out of them. Remember to dig relief trenches deeper than those you are growing in. Water goes down hill naturally.

 

[FatherEarth]

That GH looks to long for good air flow,you need to get it moveing more.

Have you thought of passive heating?
You can take old tires and stack them along the edge of the gh,2 or3 high. In the center of the tires use trash bags(3 inside each other to keep them from leaking) and fill them with water and tie shut. The sun will heat them up and will hold it through the night.

IT works!

Yes I have considered passive heating, but it doesnt work so well in winter, nor do I have the control over the temp as much as a gas fired greenhouse heater. The Greenhouse is 70' long with 2 20" fans pulling a total of 10,000 cfms thru 2, 24" intakes there is plenty of airflow, infact a little more cfm's than needed according to sq footage requirements. Thanks for all the advice

 

[FatherEarth]

Not to mention 4, 2500 cfm fans moving the air in a circle placed evenly around the greenhouse. I think the air flow is quite adequate IMO

 

[Zdub7k]

I would prolly just stop watering for a week..theyll be back in no time....other than that relief ditches are your only option...you could dig a deep ditch the length of the GH and just make sure its deeper than your planting trench. Water will naturally fill the trench with surrounding supplies.

 

[shmalphy]

What festival were you at?

 

[SeaMaiden]

There is a difference between circulation and ventilation. You may have fantastic laminar flow, but is it being VENTILATED?

The temps at night dip down below 60 into the low 50's which makes the RH jump to 85-99... Temps during the day without the fans going get into the high 90s. They are linked to a sentinel controller that kicks on at around 90. The high temp today is going to be around 74 outside...

Cannabis can easily handle those low temps. I agree, it seems that the best thing you can do is lift that cover during the day to allow better transpiration and evaporation. Nothing will dry out if the RH is that high, that's like trying to line dry clothes in Hong Kong (doesn't work!).

Your only other option is to install a dehumidifier if you can't or won't open up the greenhouse.

 

[FatherEarth]

Yea Im aware of the dif between circulation and ventilation. If you stand in front of the door with the fans on its quite windy, sucking in cool outside air x the circulation fans. 10,000 cfm circulating and 10,000 cfm being pulled out of the greenhouse. So today I let the greenhouse get to 108 degrees, didnt allow the ventilation to come on.... All the plants were standing tall and leaves praying to the sun, leaves uncurling. The greenhouse walls were running with condensation. The ventilation is running now, seems to have helped them sweat it out a bit. No wilting or upward curling, looking much better.
Thanks for all the advice!

FYI I was at cheese at hornings hideout... Wonderful time

 

[FatherEarth]

So I have 2, 20 inch, 5000 cfm J&D fans pulling from one end. I have 2, 24" intake vents on the opposite end. Then I have 4, 2500 cfm fans for circulation mounted to 4x4s in the greenhouse, maybe that makes the picture a little more clear for those who dont understand the setup...

 

[FatherEarth]

Keep in mind this is immediately after I turned the fans on from sweating them at 108 so the walls are moist, its normally never like that except at night, hence the need for the heater even in the middle of summer.

Intakes


Air out


Circulation fans



Leaves uncurling

 

[FatherEarth]

The low temps arent the worry its the dew point that is the concern. once it falls below 60 the RH is ridiculous, its more of a mushroom environment than a gardening GH. Once flowers set in that will spell mold explosion in this part of the woods....