Intercroping HDP mango for initial 3 years in west uttar pradesh

I am planting mango orchard with 2 distances
-.5 hectare is 5 *5 m distance

  • 0.5 hectare is 4*3 m distance

-What shall i choose for intercrops in initial years
-If any one know any good place where i can get hdp suitable grafted trees
Your help will be appriciated friends