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Mantell, A., Division of Irrigation, Volcani Institute of Agricultural Research, Rehovot, Israel
Goldberg, D., Department of Irrigation, Faculty of Agriculture, Hebrew University, Rehovot, Israel
A study was conducted to examine the effect of water application rate on the structure of a clay soil with high aggregate stability. A rainfall applicator was constructed to produce uniform drops of 2·59 mm dia, falling from a height of 2 m onto soil samples located on a revolving turntable. Irrigation rates ranged from 1·7 to 20·7 mm/h. In all the treatments, an equal amount of water was applied, equivalent to a rainfall of 5·6 mm. The duration of the irrigation period varied accordingly. After water application, the air permeability of the wet soil crust was determined, as well as the strength required to drive a penetrometer into the soil to a depth of 0·5 cm. As the rate of water application increased, there was a significant reduction in air permeability of the crust, and a significant increase in the pressure required to penetrate the upper soil surface. The penetrometer appeared to be very sensitive to soil structure changes. © 1966, The British Society for Research in Agricultural Engineering. All rights reserved.
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Effect of water application rate on soil structure
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Mantell, A., Division of Irrigation, Volcani Institute of Agricultural Research, Rehovot, Israel
Goldberg, D., Department of Irrigation, Faculty of Agriculture, Hebrew University, Rehovot, Israel
Effect of water application rate on soil structure
A study was conducted to examine the effect of water application rate on the structure of a clay soil with high aggregate stability. A rainfall applicator was constructed to produce uniform drops of 2·59 mm dia, falling from a height of 2 m onto soil samples located on a revolving turntable. Irrigation rates ranged from 1·7 to 20·7 mm/h. In all the treatments, an equal amount of water was applied, equivalent to a rainfall of 5·6 mm. The duration of the irrigation period varied accordingly. After water application, the air permeability of the wet soil crust was determined, as well as the strength required to drive a penetrometer into the soil to a depth of 0·5 cm. As the rate of water application increased, there was a significant reduction in air permeability of the crust, and a significant increase in the pressure required to penetrate the upper soil surface. The penetrometer appeared to be very sensitive to soil structure changes. © 1966, The British Society for Research in Agricultural Engineering. All rights reserved.
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