An excellent method of saving water for irrigation. A system devised in Israel in 1960, the water is fed to the plants drop by drop from holes in plastic pipes and the plants grow healthy with minimum usage of water.
This is a natural process by which earthworms are used to convert waste matter e.g. cow dung to manure. The earthworm used for this are generally the red variety and manure can be available within 5 to 6 months of start of the process.