Dear Nandisri,
1. you referred to concentrated food for cows, or humans or plants ??
2. Silage procedure for grass storing is published in ANNADATA telugu magazine by eenadu press. contact your nearest govt. animal husbandry dept. they will give you the procedure. it involves storing the cut grass in layers , spraying each layer with jaggery water and little of urea mixed water and air tight cover on top.
regards