The moisture status of the soil is a critical factor influencing plant production. Correct irrigation scheduling can control the soil moisture status reducing through-drainage and maintaining optimum levels of soil water for maximum plant growth.

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To implement a reliable and accurate irrigation scheduling regime regular, objective soil moisture readings are essential. There are different technologies available for obtaining soil moisture content including ADR, TDR, capacitance and neutron. The choice of instrumentation will be determined by the form of information required by the operator, the soil type, crop, relative cost, and the reliability and ease of use in the field.