Field Operation of an Artificial Perched Watertable Machine

概要

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To retain summer runoff rain-water, an artificial perched watertable was constructed at about 0.5 m depth in an area where the annual precipitation occurs mostly in the summer season. The water in the sand-filled permeable layer could be used as capillary water for plants in the dry spring season. A special machine was developed to create the artificial perched watertable. This paper deals with the field operation testing of this machine.<BR>The results showed that when the soil water content was more than the plastic limit (PL) and the soil penetration resistance of the field was less than 2 MPa, the penetrating velocity of the injector into ground was constant at about 50 mm s<SUP>−1</SUP> and a insert of 0.5 m in depth was obtained. A perfect underground cavity was produced due to the horizontal rupture fracture of the soil, when the soil water content was more than 25% d.b. Hence, when this machine is operated in a field, in order to obtain the perfect insert of the injector and the perfect underground cavity production, the soil water content should be more than the plastic limit. Charging air into the charge tank and charging sand into the sand tank occupied 98% of the total time. Charging air into the charge tank required 93% of the total operating energy.
Asian Agricultural and Biological Engineering Associationの論文