Kul kayda

Dear all 

i want information regarding kul kayda 

i have farm of 3 acers in which kul is there but kul is cultivating  only 36 gunthe out of 3 acers 

we have nikal and jabab of kul saying that I am cultivating only 36 gutha

now kul died and their varsdar want to add there name on 7/12

I want to know that they have right on entire 3 acres or only on 36 guntha ???

Thanks in advance