Minimum Soil Quality Determinant for Rice and ?Kayu Putih' Yield under Hilly Areas

摘要

Background and Objective: Soil quality indicator is an important instrument necessary to plan the sustainable forest management practices. This research aims to minimum soil quality determinant for rice and ‘Kayu Putih' yield under hilly areas. Materials and Methods: The survey-based research was conducted during February-August, 2015 in Menggoran Forest Resort, Playen Forest Section, Yogyakarta Forest Management District, Indonesia. The Stratified Random Sampling method was used during the survey-based research by stratifying soil type. Soil type was chosen as the factor consisting Lithic Haplusterts, Ustic Endoaquerts and Vertic Haplustalf. Physical, chemical and biological characteristics of the soil, rice and kayu putih variable were observed during the research. The determination of soil quality minimum data set was done by using one-way analysis of variance (ANOVA), multivariate analysis of variance (MANOVA), structural equation modelling (SEM) and standardized stepwise regression. Results: The results showed that root, stem and leaf dry weight of rice is the highest at Ustic Endoaquerts followed by Vertic Haplustalf and Lithic Haplusterts. No significant difference was observed in branch dry weight of kayu putih in each soil type. Leaves dry weight of kayu putih on Lithic Haplusterts and Vertic Haplustalf shows significantly higher (α<0.05) results than Ustic Endoaquerts. Conclusion: The study was concluded as the minimum soil quality determinant for rice and kayu putih yield under hilly areas are an amount of soil’s microorganism (SM), available phosphorus (Ave-P), exchange potassium (Ex-K) and soil respiration (SR) factor. The application of organic materials should be done as a strategy for rice-kayu putih sustainable management.