text: what is the maening of irrigation?   1) irrigation means that supplying water to land to allow plants to grow, usually through a system of little channels.  2) it has over 700 years history. legend says that in egypt near river of nile about 7000 , in china about 4200 and in sri lanka about 2300 before had been used the irrigation systems.  3) the four main methods used today to irrigate fields are flood, furrow, sprinkler, and drip, or trickle, irrigation.