Abstract
A soil water retention curve determination method is developed based on the use of gipsblock and capacitance sensors. The objective of the research was to provide a simple and quick method in characterization of soil water retention in the laboratory based on resistance and capacitance sensors. Undisturbed soil sample collected using stainless steel ring sampler 8cm in diameter and 6cm height. Digital gipsblock and capacitance sensors connected to personal computer detected periodically water tension and volumetric water content of the sample. To test the reliability of collected data, measurement using pressure plate apparatus was also conducted. Result of the experiment for soil samples textural classes loam to clay loam leaded well compromise with result from pressure plate. However, significant deviation of soil water content has been detected as the soil water suction exceeded 15,000hPa. Deviation of measured water content increased with the reducing water content up to 0.300cm3.cm-3. Implication of this result showed a further finer standardization assesing water tension above 10.000hPa is needed.
Highlights
Laboratory Determination of Soil Water Retention Curve using Resistance and Capacitance Sensors
A soil water retention curve determination method is developed based on the use of gipsblock and capacitance sensors
quick method in characterization of soil water retention in the laboratory based on resistance and capacitance sensors
Summary
Tensiometer digital dibuat dari bahan dasar gipsum, dan higrometer dari kapasitans keping jajar logam tahan karat (Bowo et al, 2006). Sampel tanah dalam ring sampler diameter 8 cm tinggi 6 cm disisipi sensor tensiometer dan higrometer yang terhubung ke komputer Pentium-II lewat kabel RS232. Timbangan digital kapasitas 3.000 g dengan ketelitian 0,1 g diletakkan di bawah sampel untuk tujuan perbandingan ketelitian. Keterangan: a: sample tanah dalam ring dengan evaporator, b: tensiometer, c: higrometer, d: logger, e: komputer. Penggunaan Tensiohigrometer di laboratorium (ukuran gambar tidak proporsional). Evaporator berupa kipas angin kecil dilengkapi lubang kontrol digunakan untuk mempercepat proses evaporasi (Gambar 1). Data disimpan dalam komputer dan diambil lewat disket untuk pengolahan lebih lanjut. Sampel tanah dikumpulkan dari beberapa wilayah di sekitar Jember dengan ring sampler tahan karat diameter 8 cm dan tinggi 6 cm.
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