Pemetaan Status Unsur Hara N, P, dan K Pada Lahan Sawah di Kecamatan Tualang, Kabupaten Siak

Abstract

The need for nutrients in rice plants can be determined based on the available nutrient levels in the soil. With the Geographic Information System, farmers can easily find out about the distribution of nutrient criteria on the planted land. This study aims to survey and map the distribution of nutrients status of Nitrogen (N), Phosphorous (P), and Potassium (K) in paddy fields in Tualang District, Siak Regency. This research was conducted at the Research and Technology Laboratory, Faculty of Agriculture, University of North Sumatra and the Analytical Laboratory of PT. Socfin Indonesia (SOCFINDO) from March 2023 to May 2023. The method used is the survey method by observing the sample directly. Sampling was carried out using Purposive Sampling technique by combining composite samples. Soil sample analysis was carried out namely, N total using Kjeldahl method, P-available using Bray II method, and K- exchange using NH4OAC method. Then continue mapping using QGIS 3.16 (Quantum Geographic Information System) spatial analysis. The results of this study indicate that the distribution of N-total has 3 nutrient mixtures, namely medium area of 3.8 ha (11.08%), high area of 4 ha (11.66%), and very high area of 26.5 ha (77.26%). The available P distribution has very high criteria, namely 34.3 ha (100%). The K-exchange distribution has 2 nutrient criteria, namely medium area of 30.3 ha (88.34%) and hsigh area of 4 ha (11.66%).