This instrument is such that, it has to be inserted in the soil to a pre set depth so that the Syringe nose is completely in the soil and tip if the Syringe nose in near the roots deep into the soil. All of these devices work in series connection of water line. The quantity of water is controlled by the Knob. There is a Calibrated dial on the instrument which allows easy setting of this equipment. The Choking tube indicates the farmer about functionality of SDRI.
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