ABSTRAKAnalisis mengenai daya dukung lahan pertanian tanaman pangan sangat penting dilakukan untuk mengetahui sejauh mana kemampuan lahan pertanian dalam mendukung pemenuhan kebutuhan pangan penduduk di suatu daerah. Salah satu permasalahan di Daerah Aliran Sungai (DAS) Cibaliung adalah rendahnya kemampuan lahan dalam memenuhi kebutuhan pangan sehingga penduduk tidak bisa memenuhi kebutuhannya secara mandiri. Penelitian ini bertujuan untuk mengetahui tingkat daya dukung lahan pertanian tanaman pangan dalam mencukupi kebutuhan pangan masyarakat di DAS Cibaliung, Provinsi Banten. Secara spasial penelitian ini meliputi 2 kabupaten yang terdiri atas 15 kecamatan dalam lingkup DAS Cibaliung. Data yang digunakan adalah data sekunder yang diambil dari Badan Pusat Statistik dan Dinas Pertanian dan Peternakan Kabupaten Pandeglang dan Kabupaten Lebak. Hasil penelitian menunjukkan bahwa secara keseluruhan berdasarkan data 4 tahun (periode tahun 20132016) daya dukung lahan pertanian pangan DAS Cibaliung secara keseluruhan masih rendah. Selain itu, jumlah penduduk optimal yang mampu didukung kebutuhan pangannya oleh lahan yang tersedia masih lebih kecil dibandingkan dengan jumlah penduduk yang tercatat di masing-masing kecamatan di DAS Cibaliung. Hal ini menunjukkan bahwa wilayah DAS Cibaliung belum mampu berswasembada pangan dan belum mampu memberikan kehidupan yang layak bagi penduduknya. Oleh karena itu, perlu dilakukan upaya-upaya tertentu untuk meningkatkan daya dukung lahan pertanian pangan di daerah ini, misalnya dengan menekan jumlah penduduk dan memperbaiki kualitas sumber daya lahan pertanian melalui upaya pertanian konservasi dan diversifikasi jenis tanaman pangan. Kata kunci: daya dukung, DAS Cibaliung, lahan pertanian ABSTRACT Analysis of carrying capacity of agricultural land for food crops is very important to do to determine the extent of the ability of agricultural land in supporting the fulfillment of the food needs of the population in an area. One problem in the Cibaliung watershed is the low ability of land to meet food needs so that residents cannot meet their needs independently. This study aims to determine the level of carrying capacity of agricultural food crops in meeting the food needs of the community in the Cibaliung River Basin (DAS) of Banten Province. Spatially, this study covered 2 regencies consisting of 15 districts within the scope of the Cibaliung watershed. The data used were secondary data taken from the Central Statistics Agency and the Agriculture and Animal Husbandry Office of Pandeglang and Lebak Regencies. The results showed that overall based on 4-year data (for the period of 2013-2016) the carrying capacity of the Cibaliung watershed agricultural land as a whole was still low. In addition, the optimal number of populations that is able to be supported by the available food needs is still smaller than the total population recorded in each district in the Cibaliung watershed. This shows that the Cibaliung watershed area has not been able to be selfsufficient in food and has not be...

Land use has become one of the causes of watershed damage, resulting in complex physical, economic and social problems in both upstream and downstream. This study aims to determine the direction of land use planning for the development of agroforestry in the Upstream of Ciliwung River Watershed of West Java Province. The orientation of the land use planning for agroforestry development was conducted by determining the type of agroforestry to be developed, the land capability class, as well as soil and water conservation agroforestry techniques to be applied. The results of this study showed that the determination of the agroforestry land use planning in the Upstream of Ciliwung River Watershed of West Java Province is directed to the development of agroforestry. Plant recommended to be developed on agroforestry land use include the annual crops combined with seasonal crops, and the application of conservation techniques; including terrestrial, gulud terrace, mulching, and terrace strengthening-plant.

ABSTRAKPermasalahan sumberdaya air meningkat diantaranya berupa penurunan ketersediaan air akibat perubahan penggunaan lahan. Sementara kebutuhan air meningkat seiring bertambahnya jumlah penduduk dan peningkatan aktifitas ekonomi. Perubahan penggunaan lahan berdampak pada rusaknya keseimbangan tata air Daerah Aliran Sungai (DAS) Way Besai. DAS Way Besai seluas 44.720 ha mempunyai peranan penting dalam penyediaan sumber daya air ke wilayah sekitarnya sehingga perlu dipertahankan fungsinya. Tujuan penelitian ini adalah 1) mengkaji pasokan air (water supply) dan kebutuhan air (water demand) di DAS Way Besai, 2) mengkaji neraca pasokan dan kebutuhan air DAS Way Besai, 3) menyusun rekomendasi perencanan pengelolaan lahan yang terbaik. Penelitian dilaksanakan di DAS Way Besai pada tahun 2011. Berbagai persamaan matematik digunakan untuk menduga pasokan, kebutuhan dan neraca air DAS Way Besai. Model SCS (Soil Conservation Service) digunakan dalam penyusunan skenario perencanaan penggunaan lahan untuk memprediksi aliran permukaan. Hasil penelitian menunjukkan bahwa kebutuhan air di DAS Way besai sebesar 441.450.909 m 3 /thn dan pasokan air sebesar 460.452.600 m 3 /thn. Kebutuhan air masih dapat dipenuhi dari pasokan air yang ada namun distribusi air bulanan tidak merata, sehingga pada bulan-bulan kering terjadi kekurangan air. Penelitian menunjukan bahwa skenario-4 penggelolaan lahan HKm pola penanaman agroforestry, merehabilitasi kawasan hutan yang tidak ada ijin HKm dan merubah pengelolaan lahan kopi monokultur diluar kawasan hutan menjadi pola tanam kopi campuran merupakan skenario terbaik. Skenario-4 menghasilkan aliran permukaan 1.055,79 mm/tahun, koefisien total aliran permukaan 38,52 %, pasokan air tahunan sebesar 472.147.141 m 3 /tahun, simpanan air tahunan (storage) sebesar 7.911.616 m 3 /tahun, dan dapat memenuhi kebutuhan air pada bulan kering sebesar 58.48% dari kebutuhan yang ada.Kata kunci: Penggunaan lahan, aliran permukaan, pasokan air, kebutuhan air, DAS Way Besai. ABSTRACT

Agriculture 3.0 and Agriculture 4.0 requires appropriate agricultural practices, including soil data that are practical, accurate, and easy to understand. Using soil type maps and land suitability class maps for soil information not only challenges users but also does not provide soil quality information such as production potential and plant growth and production inhibitors. Other techniques that can provide more appropriate soil information for agricultural purposes are thus needed. This research suggests the soil assessment system Soil Quality Index Plus, which provides accessible information regarding soil conditions and plant growth and production inhibitors in the context of dryland farming. Field trials were conducted in 36 locations across five regencies in West Java, Indonesia. Soil Quality Index Plus accurately assessed soil quality by using 11 key parameters as a dataset: effective depth, texture class, bulk density, drainage, pH, cation exchange capacity, total organic nitrogen, available phosphate, exchangeable potassium, aluminum saturation, and total carbon organic. The majority of the soils studied were classified as medium soil quality, with low organic carbon being the most common limiting factor. Improved fertilizer management, especially the use of organic fertilizers, phosphate- and nitrogen-based fertilizers, and agricultural lime should be implemented in particular areas.

Soil hydraulic conductivity is one of the important soil characteristics that determines the amount and proportion of water that will be infiltrated into the soil column and flowing as surface runoff. It is strongly influenced by soil porosity and soil characteristics that affect the soil porosity such as soil texture and structure and soil organic matter content (internally factors) as well as land management and the intensity of plant canopy cover (external factors). This research is aimed to identify the character of soil hydraulics conductivity in different landuse that consist of forest, agricultural land (moor land, cacao plantations, intensive and conservation annual crops), and green open space areas. The results showed that: a) forest conversion into agricultural land led to the decline of soil quality such as decreased levels of soil organic matter, soil porosity and distribution of soil pores so that the conversion of forest land into agricultural land decreases the soil hydraulic conductivity of both for the initial value and saturated hydraulic conductivity; b) forets canopy cover density affects the soil quality and soil hydraulics conductivity, where high canopy cover has the higher value of soil hydraulics conductivity compared to medium and low canopy forest; c) Situgede tourism forest has the lowest soil hydraulics conductivity compared to other forest types; d) soil hydraulics conductivity in conservation annual crops is higher than intensive annual crops land and Situgede tourism forest and it’s not significantly different from the soil hydraulics conductivity in low canopy forest; and e) soil hydraulics conductivity in green open spaces area were strongly determined by the naturalness of landscape and human intervention level on its formation and management, where the UI city forest and Lembah Gurame city park which were function as ecotourism areas has the lower soil hydraulics conductivity compared to great forest park.

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Ciujung Watershed is the biggest and considered as one of major watershed in Banten Province related to floods that take place almost each year in the area. The study aimed to review the SWAT (Soil and Water Assessment Tool) Model performance in predicting flow discharge and sediment yield to determine the best management practice to reduce those parameters in Ciujung Watershed. There were some steps in running SWAT model, including: (1) delineate watershed; (2) create Hydrology Respon Unit (HRU); (3) HRU definition; (4) climate data input; (5) write SWAT input files; (6) run SWAT model; (7) calibration and validation; and (8) hydrological parameters simulation. The study showed that the model had a good performance in predicting flow discharge with R 2 and NSE values in calibration process of 0.83 and 0.65 respectively. Meanwhile the model resulted not satisfied performance in predicting sediment yield with R 2 value of 0.55 and NSE value of -193.62. Validation process in predicting flow discharge produced R 2 and NSE values of 0.78 and 0.63 respectively. Land management practices used in this study are reforestation, land degradation rehabilitation, soil and water conservation practice with vegetative and mechanical method, and all land management practice implementation. The last scenario is the best management practice that can be implemented in Ciujung watershed to maintain watershed condition. The scenario produced the best river regime coefficient by 65 (moderate), reduced direct runoff and sediment yield by 46% and 95% respectively, and increased lateral and return flow by 32% and 80% respectively. Keywords: Best management practice, flow discharge, hydrological parameters, sediment yield, SWAT model 157 91 65 Kategori J J J J S S

The practice of tin mining, especially in the Pedindang Sub-Watershed, Central Bangka Regency, Bangka Belitung Province was not carried out carefully and protectively because it produced soil damage or land degradation. The purpose of this study was to examine soil properties, particularly soil physical properties, and soil damage in the Pedindang Sub-Watershed with various land uses, namely tin mining, forests, dryland agriculture and thicket shrubs-bushes, on various slope classes. The properties of the soil studied were the content of organic matter, sand, silt, clay; bulk density; porosity, and soil permeability. Compared to other land use (forest, dryland agriculture and shrubs) in the Pedindang Sub-Watershed area, tin mining land use show the worst soil properties. Soils in tin mining land use were degraded, has very low organic matter content; the lowest clay content; the highest soil density as indicated by high bulk density and low soil porosity; and the highest sand content so that it can be understood if it has the highest and very fast soil permeability.