hello leaves doesn't mean nitrogen deficiency. I t can be also lack of enough water or pest or disease incident. Check your soil whether it is too dry or not to know your plant has enough water. If it is pest incident, you will find small bug on your plant or near your plant. If it is a disease issue, you will find some spot on the leaves. please check these symptoms.

Yes it is definitely nitrogen deficiency. Please use nitrogen containing fertilizer especially in liquid form in order to show rapid response.

I will try it thank you