Ecompost
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its a little on the dry side buddy. If you consider that a plant in a lit room is busy absorbing energy, it must be capable of balance. To do this, the plant requires the environmental conditions to suit. When we fall out of range, we under transpire. When we under transpire we dont get full access to nutrients and or water and this will impact yield whatever you are getting today.28 degrees is at canopy level and the Room drops to 18 degrees with lights off usually RH is at between 28%-40% tops and that’s usually 40% after been watered
What you are doing now is great, if you want to move to the next level, the art is the environment and understanding how nature balances energy.
Read the article in the link i sent you. You will see how we can change the environment to suit most perfectly each aspect of plant growth. EG. veg, early bloom and late bloom all have a range of VPD that works best. If you see this as spring, summer and autumn and you as an environmental mimic :-)