Land Suitability on Degraded Soils of Unda Watershed at Karangasem, Bali, Indonesia

Land suitability on degraded Soils of Unda watershed at Karangasem, Bali, Indonesia aims: providing a database of land suitability for land use planning in support of sustainable agricultural development, providing spatial information such as land suitability maps, and provides guidance/recommendations in accordance with the land use plan of inhibiting factors that exist. Identification of characteristic data/land quality evaluation survey carried out by the method of land with exploration area of research followed by soil sampling at some sample of land units, and the analysis of soil samples in the laboratory. Land suitability classification using the criteria of the Technical Guidelines for Evaluation of Land For Agricultural Commodities of Soil Research Institute (2003) is by way of matching/ matching between the qualities/ haracteristics of the land with the requirements of growing plants was evaluated. Types of agricultural crops that are evaluated include plantation crops (coconut, cocoa, clove, coffee robusta) and food crops hotikultura fruits (bananas, citrus, durian, jackfruit, snake fruit, rambutan, mangosteen and mango). Suitability actual land (land suitability based on survey data) are mostly classified as not suitable (N), and marginally suitable (S3). Qualities/characteristics as the land that is the main limiting factor, among others: quality of land erosion, slope, water availability (rainfall and dry months), temperature, rooting media (soil texture and coarse material). Based on the assumption of business improvements that can be made to the quality/ characteristics of the land is an inhibiting factor, land suitability classes potential to: a). Plantation crops (coconut, cocoa, clove, and robusta coffee) ranged from not match (N), is quite appropriate (S2), marginally suitable (S3). Quality land is a limiting factor is: the quality of land erosion, slope, temperature, availability of water (rainfall and dry months), and the rooting medium (soil texture, and coarse material); b). Horticultural crops fruits (bananas, citrus, durian, jackfruit, snake fruit, rambutan, mangosteen and mango) ranged from not match (N), is quite appropriate (S2), marginally suitable (S3), and is very suitable (S1). The quality of land that is a limiting factor for the development of horticultural crops of fruit are: quality of land erosion, slope, land quality water availability (rainfall, dry months), temperature, rooting media (soil texture and coarse material). Recommendations/referrals sustainable land use planning can be recommended with agroforestry (agroforestry), accompanied by vegetative conservation measures because it is cheaper and easier to be carried out by farmers. Recommended cultivation effort is a combination of timber plants with horticultural crops of fruits with the provisions of at least 40% must be enclosed timber. Plant timber that can be developed between the other plants that are not too heavy canopy like gempinis, Jabon, or species of forest plants such as flowering butterfly sengon and ect. Some types of plants preventing erosion and landslides land that has a taproot in and root branches of many that could be recommended according to the local biophysical conditions are: Aleurites moluccana (Pecan), Vitek pubescens (Laban), Lagerstroemia speciosa (Lagerstroemia), Melia azedarach (Mindi) , Cassia siamea (Johar), Acacia villosa, Eucalyptus alba, Leucaena glauca. On the cliffs of the gorge land / river can be recommended either side of the bamboo plant.