Update Artikelilmiah: 3890

ANISSA ROSA SUGESTI

NIM

Judul Artikel

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.

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