Geographia Technica, Vol 17, Issue 2, 2022, pp. 208-219
MAPPING OF SUBAK AREA BOUNDARIES AND SOIL FERTILITY FOR AGRICULTURAL LAND CONSERVATION
Ida Bagus Putu BHAYUNAGIRI 
, Moh SAIFULLOH
ABSTRACT: Soil fertility is the most crucial aspect of the sustainability of agricultural land productivity. As an agricultural country, Indonesia is closely related to agricultural activities and soil fertility. This scientific paper analyzed the boundary of subak, soil fertility condition, which will later be used as a guide for agriculture land conservation. Subak is a traditional Balinese farmer organization that aims to manage water irrigation and rice cropping patterns in paddy fields. Boundary subak agricultural land is determined by participatory mapping method, involving farmers. Soil fertility data were analyzed through field and laboratory surveys. The condition of the limiting factors for soil fertility in each mapping unit is then used as the basis for managing and conserving agricultural land. The result showed that area of subak in agriculture land is 2,177.33 ha divided into 65 Subaks. Soil fertility status in each Subak is grouped into two soil fertility statuses (medium and high). Therefore, it is necessary to carry out integrated soil conservation, such as returning plant residues into the soil periodically and adding organic matter and fertilizers containing P and K elements in single fertilizers and compound fertilizers. Adding P and K compound fertilizers is needed to support optimal land productivity and increase the CEC value of the soil. Types of organic matter can be applied to the soil by returning crop residues, manure, and composting.
Keywords: GIS, Conservation, Mapping, Soil Fertility, Subak, Bali-Indonesia.
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