Artikel Ilmiah : A1H008019 a.n. ANISSA ROSA SUGESTI
| NIM | A1H008019 |
|---|---|
| Namamhs | ANISSA ROSA SUGESTI |
| Judul Artikel | PENGUKURAN KADAR AIR TANAH BERPASIR DENGAN KANDUNGAN BAHAN ORGANIK YANG BERBEDA BERBASIS SENSOR RESISTANSI MODEL PROBE EMPAT KAKI |
| Abstrak (Bhs. Indonesia) | Pengukuran kadar air tanah sangat penting untuk menunjang kegiatan pertanian. Penggunaan sensor blok gipsum merupakan salah satu pengukuran kadar air tanah berbasi resistansi listrik. Namun, penggunaan sensor blok gipsum kurang efisien, karena terlalu sensitif dengan kandungan larutan tanah. Penelitian ini bertujuan untuk mengetahui respon dari pengembangan sensor resistansiterhadap kadar air tanah berpasir dengan kandungan bahan organik yang berbeda. Sensor yang digunakan adalah sensor probe empat kaki berpelindung ( shielded) dan tanpa pelindung (unshielded) dengan perlakuan tanah berpasir tanpa penambahan bahan organik, penambahan bahan organik 5% dan 20%. Pelaksanaan penelitian dilakukan dengan pengambilan data resistansi listrik dan kadar air tanah gravimetrik. Pengukuran resistansi dilakukan dengan menanam sensor, kemudian dihubungkan dengan skuisisi dan komputer. Setelah pengukuran resistansi, dilakukan pengambilan sampel tanah untuk analisis kadar air tanah se cara gravimetrik. Data yang diperoleh diolah menggunakan analisis garis dan Root Mean Square Error.Hasil penelitian menunjukan bahwa resistansi listrik akan semakin besar dengan menutunnya kadar air tanah, tetapi semakin kecil dengan meningkatnya kandungan bahan organik. Hal tersebut disebabkan, karena bahan organik dapat meningkatkan kemampuan tanah mengikat air dan kapasitas tukar kation. Sensor tanpa pelindung memiliki persamaan kalibrasi dengan tingkat korelasi yang sangat kuat, sebesar 0,93 dan sensor berpelindung mamiliki nilai korelasi sebesar 0,85. Hasil perhitungan RMSE sensor tanpa pelindung dan berpelindung adalah 1,52 dan 1,82. |
| Abtrak (Bhs. Inggris) | Measurement of sandy soil water content is essensial for agricultural activities. Gypsum block sensor is one of the popular indirect methods for measuring soil water content based on electrical resistance parameter. However, the sensor are insufficeiently reliable to apply, due to over sensitive response upon soil solution. This research was aimed to identify the response of developed electrical resistance sensor with four point probe model against water content of sandy soil having various organic matter composition. There were two type of four point probe sensor, namely sehielded and unshielded sensor, used in this research. The sensor was applied into sandy soil having 0%, 5% and 20% organic matter added. Output resistance was recorded by personal computer with software inside. Each treatment was repeated two times, and then the water content was measured gravimetrically. The least square method was applied into the measured data to identify the relationship between electrical resistance of the sensors and gravimetric water content. The accuracy of predicted water content (by sensor) was analysed by root mean square error. The results showed that the electrical resistance increased with decreasing soil water content, but decreased with increasing organic matter content. The high capability of organic matter added to enhance water holding capacity and cations exchange capacity of sandy soil, might corroborated the above result. The calibration data produced by unshielded sensor was 2 higher in its correlation coeficient than shielded sensor, namely 0.93 and 0.85 respectely. The RMSE of predicted water content unshielded and shielded sensor, namely 1.52 and 1.82. |
| Kata kunci | kadar air tanah, tanah berpasir, resisansi listrik |
| Pembimbing 1 | KRISSANDI WIJAYA, S.TP., M.Agr., Ph.D. |
| Pembimbing 2 | Dr. ARDIANSYAH, S.TP., M.Si. |
| Pembimbing 3 | ARIEF SUDARMAJI, S.T., M.T. |
| Tahun | 2012 |
| Jumlah Halaman | 15 |
| Tgl. Entri | (belum diset) |