About the plant leaves drooping and yellow leaves question

[yotika]

8 weeks girl
Fertilizer to give the plant a week ago.
A few days before giving botanical insecticides
Watering soil dry while continuing water supply.
Temperature :78.8-86
Humidity: 30% PH: 6.0
The air has been in circulation and out and entering
Why have yellow leaves? Why the plants will droop?

 

[trichomes]

it's all explained within this website, just have to take the time to research! could be several causes, youtube has almost EVERY answer too, (for those that don't read much)

 

[Buckshot]

It looks like nitrogen and water deficiency