Jaka Suyana

Kajian Tingkat Degradasi Lahan dan Kemampuan Lahan pada Usahatani Lahan Kering Berbasis Tembakau di Sub-DAS Progo Hulu

Title : The study of land capability and land degradation level on tobacco-based upland farming at Progo Hulu Sub-watershed. The recent and also the future problems for Indonesian concerning with agricultural environment resources are land degradation and water resources restrictiveness. Agricultural technique without awareness to concerning to soil and water conservation principles on steep and high rainfall area had caused severe erosion and land degradation at upland area of Progo Hulu sub-watershed. Land Degradation that promoted by erosion at Progo Hulu sub-watershed contributed negative effects at on-site and out-site area. The results showed that: (1) The degradation levels on upland farming area of Progo Hulu sub-watershed (7.398,54 ha) are classified as: low (708.71 ha or 9.58%), moderate (5,119.15 ha or 69.19%) and high (1,570.68 ha or 21.23%); (2) The land capability classes were dominated by Class IV (3,624.93 ha or 49.00%), followed with Class VI (2,488.82 ha or 33.64%), Class III (697.99 ha or 9.43%), Class V (450.73 ha or 6.09%), and Class VII (136.06 ha or 1.84%). Keywords: land capability, land degradation, Progo Hulu Sub-watershed

Studi Keragaan Agroekosistem untuk Pengembangan Potensi Pertanian di Kabupaten Sukoharjo Propinsi Jawa Tengah

Title : The Study of Habitual Agroecosystem to Develope Agriculture Potential at Sukoharjo Regency in Central Java. The research about habitual agroecosystem to develope agriculture potential at Sukoharjo Regency in Central Java. This research conducted from June until September, 2002. The results showed that Sukoharjo Regency regional base on the Schmidt-Ferguson climate have C-climate type (slightly wet) and D (moderate), can be separate into four (4) agroecosystem, e.i wet land, dry land, mixedfarm, and forest. Wet land agroecosystem grouped into types agroecosystem with parent rock Merapi Volcano, Aluvium, Lawu ejecta, and Wonosari-Punung formation. Dry land agroecosystem grouped into types agroecosystem with parent rock Lawu ejecta, Aluvium, and Mandalika-Wonosari-Punung formation. Mixedfarm agroecosystem grouped into types agroecosystem with parent rock Lawu ejecta, and Mandalika-Wonosari-Punung formation. Whereas forest agroecosystem exist on the Wonosari-Punung formation, and it management strategy toward as community based conservation regional. Keywords : Agroecosystem, Agriculture potential, Sukoharjo Regency

Erosion Prediction on the Agroecosystem Types at Serang Hulu Sub‐Watershed Catchment Area Kedung Ombo Reservoir in Central Java

Erosion Prediction on the Agroecosystem Types at Serang Hulu Sub‐Watershed Catchment Area Kedung Ombo Reservoir in Central Java. The research about erosion prediction on the agroecosystem types at Serang Hulu Sub‐Watershed catchment area Kedung Ombo reservoir in Central Java. The results showed that rain fall were classified slightly low‐high (1276‐2970 mm/year), rain erosivity index (R) 1546‐3894. The highest soil erosion value on the agroecosystem type of inhabitants forest is 166,56‐264,83 ton/ha/year. The lowest erosion value on the agroecosystem type irrigated paddy‐soil (1,74‐11,83 ton/ha/year), followed by rainfed field (7,28 ton/ha/year), forest protect (14,29 ton/ha/year), production forest (20,90 ton/ha/year), agroforestry (56,31 ton/ha/year), dryland ( 77,86 ton/ha/year), and mixed garden(134,34‐155,49 ton/ha/year). The efforts of soil and water conservation technique must be conducted especially for the agroecosystem inhabitants forest, mixed garden, dryland, and agroforestry to stabilize and sustainablize land productivity. Keywords: Agroecosystem, Erosion, Serang Hulu Sub‐Watershed