Hello Vamsi,

According to the rules of UGC NET exams, a candidate can apply in the subject in which they have done their post-graduation only, and if their subject is not mentioned in the list of subjects given there, then the candidate may apply in the allied field of the subject. (This is what they have mentioned on their official website)
Now, coming to your case I believe you can give in:
1) Management: which is paper number 17  (including Business Admn. Mgt./Marketing/ Marketing Mgt./Industrial Relations and Personnel Mgt./ Personnel Mgt./Financial Mgt./Co-operative Management) or
2) Labour Welfare: which is paper number 55 (including Labour Welfare/Personnel Management/Industrial Relations/ Labour and Social Welfare/Human Resource Management) 

As these two subject is exclusively for MBA students only who wants to be an Assistant Professor. 
But, for you, as you had Marketing as a major subject so ideally paper number 17 will be the best choice but since you had HR as well so you can go for paper number 55 also. Here I believe you are in an advantageous position to choose from the two depending upon your area of interest, in which you will like to build your career. So, best will be to look at the syllabus of both the subjects and make conclusions accordingly.
Hope this helps.
Good luck!

PS: If you have any further confusion, feel free to ask.

Hi Vamsi,

As you are mentioning that you studied marketing as a major subject in MBA and HR as the minor subject, it allows me to think that you may have more knowledge of the marketing subject than HR. However, the question is which subject you like the most? You may have studied marketing as your major but it’s quite possible that you are interested in HR. So, choose the subject as per your level of knowledge on the subject and your interest.

 Hope that helps.