| Summary: | This study aims to develop agricultural land management strategies to reduce the
impact of volcanic ash Bromo Volcano. Volcanic ash hazard mapping of Bromo
was conducted to identify areas affected by the eruption of the Bromo Volcano in
2010. Field surveys and GIS (Geographic Information System) analysis were
performed to create hazard maps of volcanic ash. Land suitability assessment was
conducted to determine the characteristics and land quality after the eruption of
Bromo Volcano. Matching by weighting technique using AHP (Analytic Hierarchy
Process) is used to determine the land suitability for agriculture. Land
management strategies were analyzed by identifying areas affected by volcanic
ash eruption and land characteristics analysis.
The research results showed that 8665.20 hectares or 12.77% are vulnerable to
the threat of volcanic ash Bromo Volcano. There are three main factors that
caused the area to be very vulnerable to the hazards of volcanic ash, the wind
direction, the shape of the crater of Bromo, and the elevation and location of the
caldera of Sukapura. Land suitability in Tengger Mountain dominated by crops of
potatoes and cabbage. The main limitation factors such as low pH and CEC
(Cation Exchange Capacity), too high rainfall, as well as slope and intensive
erosion. Land management strategies that can be applied is organic materials and
phosphate addition to increase soil pH and CEC as well as land conservation
action.
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