Spatial Variability in Soil Water under Adjacent Mature Oil Palm and Rubber Plantations: Application of a New Dielectric Method in Evaluating Soil Water

Hermawan, Bandi and Suhartoyo, Hery and Anandyawati, Anandyawati and Hasanudin, Hasanudin (2018) Spatial Variability in Soil Water under Adjacent Mature Oil Palm and Rubber Plantations: Application of a New Dielectric Method in Evaluating Soil Water. In: 7th International Conference on Integration of Science and Technology for Sustainable Development, 26-29 November 2018, Bali, Indonesia. (Unpublished)

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Abstract

Abstract. Oil palm plantations have commonly been addressed to release much more water from the ground by evapotranspiration compared to other crops. The current research aimed to compare the spatial variability in soil water content under adjacent oil palm and rubber plantations established in 2005 and 1995, respectively. Ten pairs of soil electrical impedance data (Z, in kΩ) were collected from the oil palm and rubber sites using a newly-developed electrical impedance meter, then converted to soil water content (θ, in g.g-1) using the equation of θ = 0.45.Z-0.2. The impedance measurements were conducted at 0-10 and 10-20 soil depths to allow the comparisons of actual soil wetness between two crops for the rooting zones. At the same time, disturbed soil samples were taken from the measurement points for the laboratory determination of soil water using the standard gravimetric method. Results showed that soils under oil palm plantation were consistently wetter than under rubber in all pairs of measurements. At the 0-10 cm depth, the average soil water content at the time of measurements was 0.04 g.g-1 higher for oil palm than for rubber. The field water content ranged from 0.310 to 0.384 and 0.268 to 0.318 g.g-1 for oil palm and rubber, respectively. The standard deviations of samples were about 0.02 g.g-1 for both crops indicating the statistical confidence that the oil palm site contained more water than the rubber site. Similar trends were found at the 10-20 cm soil depth suggesting the consistent benefit of the oil palm plantation in preserving soil water in the 0-20 cm rooting zone. Results in soil water variability gained from the dielectric method were similar to those obtained using the standard gravimetric method. Keywords: Electrical impedance, oil palm, rubber, soil water.

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 09:52
Last Modified: 02 Jun 2020 09:52
URI: http://repository.unib.ac.id/id/eprint/21183

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