Hi,
For efficient water usage use drip irrigation system and natural farming includes avoid use of any chemicals. Add FYM, compost for fertilizers and use neem based pesticides and insecticides.
For natural farming techniques please brows on internet a site called " palekar zero budget farming " ,read atleast first 4-5 articles you will get fair idea on natural farming. You can practically try it out yourself. Some of the formulations of natural fertilizers and pesticides really works good. Apart from this I have few modifications in it , if you are really interested I will give you.
