TEMPORAL AND VERTICAL CHANGES IN VOLUMETRIC WATER CONTENT AT FOUR CONTRASTING-TEXTURED SOILS

Hermawan, Bandi and Agustian, Indra and Hasanudin, Hasanudin (2019) TEMPORAL AND VERTICAL CHANGES IN VOLUMETRIC WATER CONTENT AT FOUR CONTRASTING-TEXTURED SOILS. In: The International Conference-Sustainable Agriculture, Food and Energy (SAFE), 19-21 Oktober 2019, Phuket, Thailsnd. (Unpublished)

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Official URL: https://lppm.unand.ac.id/in/forum-ilmiah/lppm/foru...

Abstract

Abstract—Soil water content can be expressed as the ratio of water and dry soil on the volumetric or mass (gravimetric) basis. The profile of soil water content refers to the volume of water held in the soil profile between field capacity and permanent wilting point in a defined depth of soil. This research aimed to compare temporal and vertical changes in soil water content profiles on the volumetric basis at four soils with different texture classes during a discharged period. The research was conducted in North Bengkulu Region during a discharged period of May-to-July 2019. Four soil profiles were described to determine characteristics of soil layers up to the depth of 100 cm. Disturbed and undisturbed soil samples were taken from 10 cm intervals; therefore there were 40 soil samples were used for the laboratory analyses of bulk density, texture and organic carbon content. Soil electrical impedance values (Z, in k) were measured every week at corresponding depths using a dielectrometer device and converted into gravimetric soil water content (g, in g.g-1) using an equation of g, = 0.65.Z-2. Gravimetric water content was then multiplied by bulk density at each 10 cm interval to get volumetric water content (v, in cm3.cm-3). Results showed that volumetric water content profiles of sandy soils temporarily changed more significant during three-months of measurements compared to finertextured soils. Vertical changes in water content indicated that water more distributed at the uppermost 50 cm of clay soil, at the 80-100 cm of sandy soil, and uniformly throughout the profiles of loamy soils. For each 20 cm layer, equivalent heights of volumetric water profiles were highest at the bottom 80-100 cm depth for sandy soils and the uppermost 20 cm for loamy and clay soils. Keywords— electrical impedance, texture classes, water content profiles.

Item Type: Conference or Workshop Item (Paper)
Subjects: S Agriculture > S Agriculture (General)
Divisions: Faculty of Agriculture > Department of Soil Science
Depositing User: Mr. Bandi Hermawan
Date Deposited: 02 Jun 2020 09:51
Last Modified: 02 Jun 2020 09:51
URI: http://repository.unib.ac.id/id/eprint/21179

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