Water is a very precious resource and a driving force in irrigation. Optimal use of water is a need of the hour. Efficient irrigation watering helps in saving water, getting better plant yields, reduce dependency on fertilizers and improve crop quality. Various methods, both laboratory, and field including remote sensing are available to measure soil moisture content, but the quickest and better one is with the use of soil moisture sensor electronic devices. For successful irrigation, it is necessary to monitor soil moisture content continuously in the irrigation fields. The selection of soil moisture probes is an important criterion in measuring soil moisture at different soil moisture sensors has their own advantages and disadvantages. The soil moisture sensors are used intensively at present because it gives real-time readings. An attempt is made in this article to review some of the sensors available, their specifications, properties, applicability, advantages, and disadvantages so that an informed decision on selection of appropriate sensor can be made for a particular application.
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