Open AccessModification Model of Soil Fertility Evaluation FAO-UNESCO on the Slopes of Merapi Volcano, Indonesia
Author(s) -
E. A. Julianto,
Partoyo Partoyo,
Sri Suharsih
Publication year - 2021
Publication title -
rsf conference proceeding series. engineering and technology
Language(s) - English
Resource type - Journals
eISSN - 2809-6843
pISSN - 2809-6878
DOI - 10.31098/cset.v1i1.420
Subject(s) - akaike information criterion , volcano , soil fertility , quadratic equation , mathematics , fertility , environmental science , hydrology (agriculture) , soil science , soil water , statistics , geology , geotechnical engineering , seismology , population , geometry , demography , sociology
One of the mountains known as active volcanoes in the world was Merapi volcano. From the very active impact of Merapi activity, there was a continuous addition of volcanic material associated with soil fertility, which can be evaluated using the Soil Fertility Evaluation (SFE) system. This study aims to obtain a more adaptive SFE system to the southern slopes of Merapi volcano by modifying the FAO- UNESCO version of SFE system that still uses linear equations. In this research used system of quadratic equation, use of natural logarithm (ln), and modification of new parameter. From the evaluation of soil fertility is then connected with the production component of paddy rice (dry grains crop). There were several indicators that used to see the quality of the model or test the goodness of fit of the model we make, for example from its R2. In this study the quality of a model was seen from: Akaike Info Criterion (AIC) and Schwarz Criterion (SC), and the data was done by using EViews 9. The results showed the parameters that influence big in the model can be seen from the correlation and influence the parameters in single. Quadratic equations can improve the quality of a model over a linear equation. The standard SFE model which is modified by using the nat