Current Science Research Bulletin

This study examined land characteristics and the actual land suitability classifications reported in the source assessment for two land mapping units (LMUs) intended for avocado (Persea americana Mill.) cultivation in Naman Teran District, Karo Regency, North Sumatra, Indonesia. According to the availablestudy records, 13 land mapping units (LMUs) were delineated using GIS. Two units, LMU 1 in Sigarang-garang and LMU 2 in Sukanalu, were purposively selected for detailed assessment based on recommendations from the sub-district government. Laboratory resultsreported by SOCFINDO for the two traceable compositesoil samples revealedcontrasting soil properties. LMU 1 had a pH of 4.37, organic carbon content of 1.90%, cation exchange capacity(CEC) of 10.33 cmolc kg−1, base saturation of 14.81%, and a loamy sand texture. LMU 2 had a pH of 5.31, organic carboncontent of 0.47%,CEC of 11.04 cmolc kg−1, base saturation of 25.67%, and a sandy loam texture. The source assessment classified LMU 1 as not suitable (N) and LMU 2 as marginally suitable (S3). The findings should be interpreted as a preliminary assessment of two selected sites rather than as a definitive district-wide land suitability evaluation. These findings also identify priorities for further field verification and provide a cautious evidence base for subsequent land-use planning and site-specific management decisions concerning avocado cultivation in Naman Teran District.

avocado, land evaluation, land mapping unit, Mount Sinabung, volcanic soils

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