Change in application rate of the sprinklers on a center pivot due to height above the ground. For comparison, the sprinkler head is assumed to be identical in all three cases and applying the same volume of water. A common question is how much nitrogen should be injected each chemigation event. Since you want to get the N to the roots, chemigating with N during a regular irrigation event is the most desirable. If circumstances are such that you need to apply the N and are not concerned about the amount of water, than the timer should be set to apply at least a quarter of an inch.
Fungicides are either protectants or systemic.
Protectant fungicides applied by chemigation provide protection to the plant by coating the above ground biomass of the plant. Systemic fungicides work by being absorbed by the plant and providing protection from the inside of the plant through the tissues. For both types of fungicides the object is to cover the plant but not put too much water on so that the fungicide is washed off. Irrigation engineers always worry about maximizing water application efficiency of the sprinkler systems, and interception losses by the crop canopy is always one of the major evaporation losses. Therefore, low application amounts are applied.