ANALYSIS OF SOIL QUALITY INDEX AT POTATO PRODUCTION CENTER IN THE UPSTREAM OF LEMBANG WATERSHED

Aprisal, Ap (2021) ANALYSIS OF SOIL QUALITY INDEX AT POTATO PRODUCTION CENTER IN THE UPSTREAM OF LEMBANG WATERSHED. [Image]

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Abstract

Potato is considered as one of the primary agricultural commodities in the upstream of Lembang watershed. Rotation cropping system using shallots is occasionally adopted, due to market price influence and higher profitability. This cultivation process typically instigates soil degradation devoid of conservation measures. The land survey approach was employed as the research method, while proportional random sampling was used to select the sample. Subsequently, the soils were categorized into intact and disturbed portions to analyze the physical (texture, specific gravity, C-organic and permeability) as well as chemical (nitrogen, phosphorus, potassium, calcium, magnesium, pH, and CEC) properties, respectively, at the Soil Laboratory of Agriculture Faculty, Andalas University. These data were processed using Minitab 17 to determine the soil quality index. The results showed the existence of three primary components (PC) termed, PC1, PC2 and PC3, believed to influence the alternating index state by 80%. Furthermore, the dominant variables of these components include exchanged potassium, organic C and clay fraction texture. Based on the calculation of component factors and soil properties, the soil quality index (SQI) was classified into moderate, good and very good conditions

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