Drip Irrigation scheduling is the process of deciding when to run the drip irrigation system, and for how long. It is a complex topic but of utmost importance because it influences whether the crop gets the right amount of water and nutrients, and whether valuable water is wasted to runoff or deep percolation. Irrigation scheduling combines data and agronomic expertise in that the irrigator must balance known facts such as weather, chemistry, stage of plant growth and farm cultural operations.