Programme Study of Soil Science, Faculty of Agriculture, University of Sebelas Maret

Email: anggastyad@gmail.com

In Indonesia, there are various types of soil. Every soil type has different properties and characteristics as a result of its forming and uses factors. The nature and characteristics of soil formed in paddy fields affect the fertility status of soil on rice fields. In Indonesia, there are three management systems, namely organic, semi-organic and conventional. The research aims to determine the fertility index of paddy fields with different management systems (Organic, Semi-organic, Conventional) on several soil types (Vertisol, Ultisol, Inceptisol). Each combination of the management system and soil type is taken 3 soil sample points as a replay so that 27 soil samples are obtained. The soil parameters analyzed were pH H2O, N-total, available-P, available-K-, exchangeable-Ca, exchangeable-Mg, Soil Organic Carbon (SOC), Aluminum Saturation, Cation Exchange Capacity (CEC), Base Saturation (BS). The soil fertility index is determined based on an indicator of selected chemical properties called the Minimum Soil Fertility Index (MSFI). Data analysis uses Pearson’s Correlation Analysis and Principal Component Analysis (PCA) to determine MSFI. MSFI values are derived from indicators that have high scores on correlation analysis and PCA. The results showed that the fertility index value of paddy fields from 3 types of soil ranged from 0.46 to 0.57. Vertisol rice fields have the highest Soil Fertility Index value (0.57) and significantly different from Ultisol and Inceptisol rice fields. The organic management system is the best management because it has a higher soil fertility index value (0.54). Vertisol rice fields with an organic management system with a soil fertility index value of 0.57 are the most ideal rice field management system.