10 m, lacation 3 (Sumberwojo) = 4 m, lacation 4 ( Susukan Tiga) = 6 m, lacation 5 (Susukan Dua) = 4 m, lacation 6 (Blarangan) = 4 m, lacation 7 (Pati-Genjahan) = 7 m, lacation 8 (Karang Duwet) = 1,5 m and lacation 9 (Pati-Genjahan) = 4 m. While from the soil physics and chemistry analyses taken from after pedogenesis process solum soil shows that, generally, soil in the research area consists of hara unsure and organic substance, so that it is suittable for planing. However, each location has different fertility weight. From 3 soil-sampling locations, it is obtained fertility weight as follows : profile 01 (Kerjo Satu-Genjahan) and profile 03 (Sambirejo- Sidorejo) weight 2 (the organic substance and hara unsure contents are low, but the soil support capacity is high), while profile 02 (Genjahan-Genjahan) weight 1 (the organic subtance and hara unsure contents are low, and soil supportcapacity is low to). It means that the fertility weight of the thick soil solum (northern part) is lower than the thin soil solum (southern part), or in other word, there is no relation between the soil thickness and its fertility degree."> 10 m, lacation 3 (Sumberwojo) = 4 m, lacation 4 ( Susukan Tiga) = 6 m, lacation 5 (Susukan Dua) = 4 m, lacation 6 (Blarangan) = 4 m, lacation 7 (Pati-Genjahan) = 7 m, lacation 8 (Karang Duwet) = 1,5 m and lacation 9 (Pati-Genjahan) = 4 m. While from the soil physics and chemistry analyses taken from after pedogenesis process solum soil shows that, generally, soil in the research area consists of hara unsure and organic substance, so that it is suittable for planing. However, each location has different fertility weight. From 3 soil-sampling locations, it is obtained fertility weight as follows : profile 01 (Kerjo Satu-Genjahan) and profile 03 (Sambirejo- Sidorejo) weight 2 (the organic substance and hara unsure contents are low, but the soil support capacity is high), while profile 02 (Genjahan-Genjahan) weight 1 (the organic subtance and hara unsure contents are low, and soil supportcapacity is low to). It means that the fertility weight of the thick soil solum (northern part) is lower than the thin soil solum (southern part), or in other word, there is no relation between the soil thickness and its fertility degree.">
Laporkan Masalah

Studi ketebalan tanah dengan metode geolistrik hubungannya dengan kesuburan tanah di Daerah Genjahan, Kecamatan Ponjong, Kabupaten Gunungkidul Daerah Istimewa Yogyakarta

WINARTI, Ir. Djoko Wintolo, DEA

2005 | Tesis | S2 Teknik Geologi

Secara administrasi daerah penelitian masuk dalam wilayah Kecamatan Ponjong, Kabupaten Gunungkidul, Daerah Istimewa Yogyakarta + 10 km ke arah timur Kota Wonosari, dengan luas + 15 km2. Sedangkan secara astronomis berada pada posisi 110o41’20” sampai 110o43’32” BT dan 07o56’46” sampai dan 07o59’30” LS. Berdasarkan pada pembagian fisiografi, daerah penelitian menempati Satuan Plato Wonosari (Wonosari Plateau), yang secara umum tersusun oleh litologi batugamping dari Formasi Wonosari. Pada bagian utara daerah penelitian, Formasi Wonosari berbatasan dengan Formasi Oyo dengan litologi batugamping, dan Formasi Semilir dengan litologi breksi lapili, breksi andesit serta batupasir karbonatan. Tujuan dari penelitian ini adalah untuk mengetahui ketebalan tanah, tingkat kesuburan, menentukan daerah yang tebal dan subur, serta mencari hubungan antara ketebalan dan kesuburan tanah di daerah penelitian. Metode yang digunakan untuk mengukur ketebalan tanah yaitu metode geolistrik aturan Wenner dengan skala mikro, elektroda yang digunakan dari jeruji dengan jarak elektroda sangat rapat (5, 7, 10, 15, 20, 25, 30 35, 45, 55, 65, 75, 85, 105, 125, 145, 165, 185, 215, 245, 275, 305, 335, 375, 415, 455, 495, 535 dan 580 cm). Dengan mengetahui harga resistivitas, maka akan diketahui lapisan tanah dan batuan dasar. Sedangkan untuk mengetahui kesuburannya, dilakukan analisis fisika tanah (tekstur), kimia tanah (pH, unsur N, P, K, Kapasitas Tukar Kation dan Kejenuhan Basa) dan kandungan bahan organik. Tanah yang diukur ketebalannya dengan geolistrik adalah tanah yang sudah mengalami proses pedogenesis dan bahan induk tanah. Sedangkan tanah yang diukur kesuburannya adalah solum tanah yang telah mengalami proses pedogenesis. Hasil pengukuran geolistrik di 9 titik menunjukkan ketebalan tanah sebagai berikut : lokasi 1 (Sumber Kidul ) = 2,5 m, lokasi 2 (Umbulrejo) > 10 m, lokasi 3 (Sumberwojo) = 4 m, lokasi 4 (Susukan Tiga) = 6 m, lokasi 5 (Susukan Dua) = 4 m, lokasi 6 (Blarangan) = 4 m, lokasi 7 (Pati-Genjahan) = 7 m, lokasi 8 (Karang Duwet) = 1,5 m dan lokasi 9 (Pati-Genjahan) = 4 m. Sedangkan dari analisis fisika dan kimia tanah yang diambil dari solum tanah yang telah mengalami pedogenesis menunjukkan bahwa secara umum tanah di daerah penelitian mengandung unsur hara dan bahan organik, sehingga layak untuk ditanami. Akan tetapi setiap lokasi mempunyai bobot kesuburan yang berbeda. Dari 3 lokasi pengambilan conto tanah diperoleh bobot kesuburan sebagai berikut: profil 01 (Kerjo Satu-Genjahan) dan profil 03 (Sambirejo-Sidorejo) berbobot 2 (kandungan bahan organik dan unsur hara rendah tetapi daya dukun tanah tinggi), sedangkan profil 02 (Genjahan- Genjaha) berbobot 1 (kandungan bahan organik dan unsur hara rendah dan daya dukung tanah rendah). Artinya solum tanah yang tebal (bagian utara) bobot kesuburannya lebih rendah dibandingkan solum tanah yang tipis (bagian selatan), atau dengan kata lain tidak terdapat hubungan antara ketebalan tanah dengan tingkat kesuburannya.

Administrativvely, the research area includes in the region of Ponjong Subdistrict, Gunungkidul Regency, Daerah Istimewa Yogyakarta, about + 10 km to the east of Wonosari Town. It is about + 15 km2 wide. While, astronomocally, it is lied in 110o41'20" to 110o43'32" East Longitude and is 07o56'46" to 07o59'30" South Latitude. Based on the physiographic division, the research area places Wononosari Plateau, which is generally formed of limestone lithology from Wonosari Formation. In the northern part of the research area, Wonosari Formation is adjacent to Oyo Formation with limestone lithology, and Semilir Formation with lapili breksi lithology, andesite breksi and carbonate andstone. The objective of the research is to find out soil thickness and fertility degree, to determine the thick and fertile areas, and to look for the relation between soil thickness and fertility in the research area. The method that is used to measure the soil thickness is arrangement Wenner micro-scale geolistric method. The used electrode is from trellis with a very close electrode distance (5, 7, 10, 15, 20, 25, 30 35, 45, 55, 65, 75, 85, 105, 125, 145, 165, 185, 215, 245, 275, 305, 335, 375, 415, 455, 495, 535 and 580 cm). By knowing the resistivity price, the soil layer and base rock will beliau detected. While to find out its fertility, soil physics (texture), soil chemistry (pH, N, P, K unsure, Kation-Exchange Capacity and Alkali Saturation) and organic substancecontent, analyses are executed. The soil to measure with geolistric is the soil was pedogenesis process and parent material soil. While, to find out the soil fertility, soil sampling taked from soil solum was pedogenesis process. The geolistric measuring result in 9 point shows the soil thickness as follows : lacation 1 (Sumber Kidul) = 2,5 m, lacation 2 (Umbulrejo) > 10 m, lacation 3 (Sumberwojo) = 4 m, lacation 4 ( Susukan Tiga) = 6 m, lacation 5 (Susukan Dua) = 4 m, lacation 6 (Blarangan) = 4 m, lacation 7 (Pati-Genjahan) = 7 m, lacation 8 (Karang Duwet) = 1,5 m and lacation 9 (Pati-Genjahan) = 4 m. While from the soil physics and chemistry analyses taken from after pedogenesis process solum soil shows that, generally, soil in the research area consists of hara unsure and organic substance, so that it is suittable for planing. However, each location has different fertility weight. From 3 soil-sampling locations, it is obtained fertility weight as follows : profile 01 (Kerjo Satu-Genjahan) and profile 03 (Sambirejo- Sidorejo) weight 2 (the organic substance and hara unsure contents are low, but the soil support capacity is high), while profile 02 (Genjahan-Genjahan) weight 1 (the organic subtance and hara unsure contents are low, and soil supportcapacity is low to). It means that the fertility weight of the thick soil solum (northern part) is lower than the thin soil solum (southern part), or in other word, there is no relation between the soil thickness and its fertility degree.

Kata Kunci : Geolistrik,Ketebalan Tanah,Kesuburan Tanah


    Tidak tersedia file untuk ditampilkan ke publik.