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How big exhaust for room size (9m x 9m x 4.5m) ?

You see the system , PVC tubes filled with coco substrate, i have 2 600w (cooltube) and they shine 9 hour each (18/6), temperature is 22 - 28 °C , moisture is ok. Now half of the plants have yellow leafs like you see on the picture. Is this lack of water , fertilizer or maybe oxygen in tubes...

Will PVC tubes (covered with glass wool) make eny effect on water temperature inside? (System 4200W 3.5m tall) or this is no worth cent and i should use ordinary pvc tubes ? If i have right the glass wool absorb some heat.

How much do you get from one single cola plant ?

I have coliseum garden and i can have only 11L pots , i veg. plants in another room. I will try to veg. in 20L pots and than i will transplate plants to coliseum garden with 11L pots (so there will be full of roots). Questions for you: Is that possible or not ? ( how will plant react on this )

All right i solve this problem: Grow room area: 700 cubic feet Amount of CO2 required: 0.84 cubic feet = 23.7861 L = 47g(15°C) 1,847Kg (co2) (15°C) = 0,9344m³ (934.4L) 1,977Kg (co2) (0°C) = 1m³ (1000L)

I have 20KG bottle I put my bottle on the scale and see how much g or kg have release to the air. How can i calculate how much do i need for Grow room area: 700 cubic feet (in grams or pounds ...) Grow room area: 700 cubic feet Amount of CO2 required: 0.84 cubic feet <- How much...

I`m running some project but i dont know result jet. 1 system (coliseum) with:2 x 600W Grolux (90.000L) (digital ballast) ,60 (plants) 11L pots 33% perlite , 33% soil , 33% vermiculite I expect 1.5 kg or maybe 2 kg. How can increase these results? If you ask me i will try: Longer...

Grow from seeds (wait until the they come out and produce two bigger leaves) than First week 18/6 Second and third week 12/12 (use veg. fertilizers) _____ Flowering period 12/12 (use flow. fertilizers)

How about that: When the seeds look out with 2 bigger leaves you put the light on 18/6 for one week. Than you put the light on 12/12 for two weeks and add only grow nutrients. ... after this is flowering stage. What do you say about that? Enyone?

What is the difference between clone and regular seeds in hydro grow. I would like to make hydro grow (rockwool)(vertical 360° SOG) with regular seeds because i dont have place for big mothers to make clones. What do you suggest i attempt to use white rino and LST method for lowering plants?!?

Hello everyone I am here to introduce my product AERO360°. This was the first picture of idea. Now look closer and you will see how much flexible is the system AERO360°. STRUCTURE : Its made from 3 towers and you can reduce highs just like skyscraper. If plant rise too close to...