MATHEMATICAL MODEL OF ACIDITY VALUE FOR NATURAL RESOURCES ACCOUNTING (NRA) IN PEATLANDS AGRICULTURE

Anisah Anisah, Agustan Agustan

Abstract


Geostatistics is a technique that is used in predicting or interpolating value of a spatially distributed variable. This technique is used in many spatial data processing such as in agriculture. The level of soil acidity is one of the important chemical properties to determine the availability, balance and soil nutrient retention as well as the basic fertilizer management and amelioration. Improper land management, especially in peatlands can lead to serious problem in future environmental aspect, so that advanced study is required. Kriging is a method in Geostatistics which gives Best Linear Unbiased Estimator (BLUE) from point value or average blocks. This paper proposes spatial data processing for predicting the value of acidity using Ordinary Kriging. The study area is in Siak District, Riau Province with fifteen data sample. According to the data analysis, it is found that the exponential model y(h) is the best model with sill value of 0,07950, range value of 41100, C value of 0,0398, and nugget effect of 0,0397. Bunga Raya Subdistrict namely Tuah Indrapura, Buantan Lestari and Jaya Pura Village has higher acidity value than other regions. Conversely, a low acidity value is found in Sungai Apit Subdistrict, Harapan Village and Sabak Auh Subdistrict, Sungai Tengah Village.
Keywords: geostatistics, ordinary kriging, peatlands

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