Abstract
Soil is one of the land resources that serves as a medium for plant growth, habitat for soil organisms, recycling systems for nutrient and organic matter and water supply mechanism. Soil qualities and characteristics will determine their ability as a land resource that could change at any time. Soil suitability evaluation conducted by soil survey, aimed to assess the characteristics of the soil, determine the limitation factors of land suitability, and alternatives cultivation to improve its productivity. This research aimed to determine land characteristics, land suitability classification, limitation factors of land suitability, and providing strategic directives for JPP teak cultivation on the research location at Ngawi and Surakarta FMU. The result of land evaluations are clay land texture, relief: flat (<3-8%) to mountainous (30-40%). Low soil infiltration rate, high water restrain ability, difficult to cultivate and high run-off potential in slope area. Soil acidity: slightly acid (6.11) to alkaline (7.81), C-organic: low (0.58) to high (3.49), N-Total: very low (0.07) to moderate (0.22), P2O5: very low (3.78) to very high (32,0), K2O: moderate (0.58) to very high (1.40), which were formed from 2,039.71 – 2,072.01 mm year-1 rainfall rate with isohypothermic soil temperature and ustic soil humidity regime. Current Land Suitability on sites is not suitable permanently (N2) due to rooting condition as limiting factor (soil effective depth). The potential land suitability to be improved is disassembling the land mechanically, application of organic substances and soil conservation implementation.
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