Identification of Soil Chemical Properties in Producing Oil Palm Plants in Kota Pinang District (Barumun Watershed Case Study)
Keywords:
Identification; Soil Chemical Properties; Productive Oil Palm; Limiting Factors; Barumun Sub-Watershed; Pinang CityAbstract
Identification of soil chemical properties is the scientific basis for efficient and sustainable fertilizer management in oil palm plantations. This study aims to identify the status of soil chemical properties and determine the main limiting factors in a productive oil palm plantation (Mature Stage/MS) in the Barumun Sub-Watershed, Kota Pinang District. The method used was a survey with composite soil sampling at a depth of 0-20 cm from 20 sample points determined by purposive random sampling. Samples were analyzed in the laboratory for parameters of pH H?O, organic-C, total N, available P (Bray I), exchangeable K, Ca, Mg, Cation Exchange Capacity (CEC), and Base Saturation (BS). The results show that the soil at the research location is very acidic to acidic (average pH 4.6) with very low exchangeable Potassium status (average 0.15 me/100g) and low Base Saturation (average 22.5%). Organic-C and total N content were classified as moderate, while available P varied greatly from very low to moderate. In conclusion, the main limiting chemical factors are a triad of problems: (1) high soil acidity, (2) acute Potassium deficiency, and (3) low Base Saturation, which are interrelated and limit nutrient availability. The proposed suggestions are the immediate implementation of a lime application program based on analysis, increasing the dose and frequency of split Potassium fertilizer application, and adopting site-specific soil fertility management approaches for plantation productivity sustainability.
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