why my plant acting crazy by end of light shift?

Hi all..my problem dont need pics i think, its as simple as follows:

By the end of each light shift 18/6 my WhiteWidow (4-5 weeks old/ 2 plants) start bending down like as if its dieng or over watered..
BUT! by the end of the dark shift (which is next to me in my ac cooled room) the plant seems more fresh and back to normal as if nothing happend.. then same happens again..4 nights now??? WHY??

some specs: -400W super MH about 30" far, hydroponic sys, basket in barrel (basic),
-ambient temp is 20-22, around canopy 28-30, humid. avr.40-60%, using organic liquid for veg. called green plants pure bioevolution, had some troubles fixing my ph cuz of the rockwool cubes, but try to keep it at aound 6 ph... air fans, pump, etc

what is it?? is it heat stress?? but temps r good...is it overwatering, dont think so...is it something with roots...but why that time cycle...its making me go crazy. plz help and more

i think i got it...it is not watered enough i think..ill go 15min per hr during light time, right?

they could be underwatered, overwatered, or just heat stress is my opinion, how close are your lights?

are you sure the plant isn't just sleeping? plants sleep just like humans do.

mine tend to 'get tired' towards the end of their cycle. if they are perky at start of lights and stay that way most of the light cycle, i think your fine. if they stay droopy from wake to sleep, then id worry.l

sounds like heat problem.. thats exactly what my plants do in the intense sun then when they get shade they perk up

17/15min water feed time cycles is ok? every hour i feed for 15 min using 2 drippers/plat since i'm using 4"rockwool in hydroron...?

dababydroman said:

sounds like heat problem.. thats exactly what my plants do in the intense sun then when they get shade they perk up

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after some good readings i think u and i got the same problem during good light periods, plants need enough water during intense light periods to sustain the more rapid evaporation happening to leaves... so u might be having an underwatering problem like me

yup. kinda sounds like underwatering to me. but shouldnt be the way you describe your feed sched. keep temps and rh in line and your good..(ph 2)..

backnine951 said:

yup. kinda sounds like underwatering to me. but shouldnt be the way you describe your feed sched. keep temps and rh in line and your good..(ph 2)..

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yup, thats the new feed schedual 17/15min, when i had the curling leaf, i was feeding 3 times/light cycl which is not nearly enough i discovered...