For most farmers in the Southeastern parts of Arizona, micro-jet irrigation is not a new concept. However, a couple of farms still rely on flood irrigation as the expenditure to transfer to a new micro-sprinkler system is costly and takes time. The benefits of micro-irrigation are that it uses less water and allows you to inject nutrients and other chemicals directly through your system, saving time and money. Even though the most optimal system would be to deliver water and nutrients at the root zone depth where most uptake occurs (30-36 inch depth), some farmers have found that laying your irrigation lines above ground is much more convenient for maintenance than buried systems.
Irrigation National Engineering Handbook