Hello Sir
There are many types of agribusiness
Either field level or clinic level or laboratory level.
U may think to cultivae tress if u have enough land such as melia dubia, teak, rosewood, casuarina
or fruit trees such as Mango, guava, pomegranate, sapota etc.
And side by side u can open up processing units of these fruits.
U may also go for vegetable farming or floriculture eithe open or hitech.
Or u can start nursery plant supply which is one of the best business specially in case of pomegranate, strawberry, blackpepper, melia dubia.
or u can start dry flower business which is the latest up coming business and has wide scope in india and abroad.
Mushroom business is also one such business.
or u can think of of medicinal and aromatic plants cultivation to processing level industry.
u can also think of tissu culture laboratories for orchids, anthurium, gerbera, strawberry.
pls visit the nearest College of Agriculture or Horticulture u will get ur help from any departments of interest.