Hello, 

Glad to know your keen interest in agriculture studies. 
Haryana Agriculture University, Hisar is one of the biggest agricultural university in India , which is in the state of Haryana. 

In order to get into HAU , You need to fill online Admission form which will be available in their website durin April tentatively. After that you need to give the Entrance exam which, if youre qualified youll be given the seat. According to Last Academic years curriculum , The online application form was released during april 28 . The prospectus  also was able to be downloaded from 28th april. 

Currently, the website regarding admissions is under maintainence. The tentative availablity of application form will be available in april.The fee structure as well as the seats will be provided in April. 

You have two courses - BSc (hons) 4 years as well as B.Sc(hons) - 6 years in the Bachelor of sciences. 
In Btech. you have B.tech (agricultural engineering).
You need to wait untill april for any application form in HAU. 

Hope it Helps., 
Good Luck.