why this is happening
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Looks thirsty.
Just water ?
Nıtrogen oxıt ?
how should i treat 
Yep. Water.
Pics under mpre natural light would help, but just plain water, ph to 6.5. If your in soil.
Back off the nitrogen a little.
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I would listen to @Covertgrower. It’s not a lack of water, because the leaves are curling, not drooping.
Are you feeding with bottled nutrients? Do you have ph & tds feeding & runoff numbers?
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And pics in natural light would help. A nitrogen toxicity will cause the leaves to appear a darker green than normal.
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If ı didnt give tham nıtrogen
And l will give them just big bud nutriens it will be ok or not? Thank you
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Not discounting nitrogen issue, water has no nitrogen in it. I asked about pics because id like to see natural leaf color before adressing nitrogen issue.