For established orchards this value ranges from 0.7 to 1. For a young orchard this value would have to be adjusted downward as we are assuming mature trees with full coverage. The measurement of soil moisture is an important aspect of irrigation scheduling. This measurement verifies that the proper amount of water is being applied. Here are a few common methods used for soil moisture measurement.
Soil feel test .
A shovel, soil auger, or push tube can be used to obtain soil samples. Samples should be taken from a depth of 8 to 9 inches to the bottom of the effective rootzone. Squeeze the soil between the thumb and index finger to form a ribbon. Soil type and the grower's experience will indicate the relative amount of moisture in the soil. Tensiometers give a direct reading of the soil moisture tension existing in the rootzone.