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All Journal Journal of Tropical Soils Jurnal Penelitian Pendidikan IPA (JPPIPA)
Basuki
Universitas Jember
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Environmental Science Materials Science & Nanotechnology Physics

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Volcanic Ash Deposition and Its Implications for Soil Biological Fertility: Insights from the Slopes of Mount Semeru, Indonesia Tri Candra Setiawati; Rifky Putra Verdiawan; Lolita Endang Susilowati; Basuki; Saddam Matovani; Bambang Hermiyanto; Syahrul Efendi
Jurnal Penelitian Pendidikan IPA Vol 12 No 5 (2026): In Progress
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v12i5.14865

Abstract

Volcanic ash from Mount Semeru can alter soil characteristics, including the biological properties. Microorganisms respond rapidly to changing environmental conditions, leading to the general consideration as sensitive indicators of soil health. In general, biological fertility status can be determined based on the Biological Fertility Index (BFI). Therefore, this study aims to assess the BFI and total population of soil microorganisms following the Mount Semeru eruption across four differently managed land-use systems, including monoculture and intercropping patterns. Field studies were conducted on the slopes of Mount Semeru, specifically in Pronojiwo Village, Lumajang Regency, at an elevation of 400-800 meters above sea level. The classification of the BFI was carried out through laboratory analysis of Soil Organic Matter (SOM), Microbial Biomass Carbon (MBC) by the fumigation extraction technique, Basal Soil Respiration (BSR), and Cumulative Soil Respiration (CSR) over a 25-day observation period, along with the total microbial population assessed using the agar plate method. The mineralization quotient (qCO2) and metabolic quotient (qM) were also calculated based on parameter measured. The results showed that BFI scores of 16.28 and 18.19 were obtained for monoculture and polyculture systems with volcanic ash cover exceeding 10 cm, showing an “intermediate” fertility status. In contrast, monoculture and polyculture land covered with volcanic ash <2 cm had BFI scores of 20.03 and 21.03, respectively, in the "Good" category. The total microbial count ranged from a medium of 4.8 x 105 cfu g-1 in the monoculture sugarcane, to significantly higher levels in intercropping leeks and chili at 5.4 x 107 cfu g-1.  
Land Suitability Evaluation for Sugarcane (Saccharum officinarum L.) Cultivation in the Rejoso Watershed, Pasuruan Regency Bambang Hermiyanto; Ani Acfiyatul Fardila; Cahyoadi Bowo; Basuki; Subhan Arif Budiman
JOURNAL OF TROPICAL SOILS Vol. 31 No. 2: May 2026
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts..v31i2.57-69

Abstract

Land suitability evaluation is essential for optimizing crop productivity and promoting sustainable land use. In the Rejoso Watershed, Pasuruan Regency, sugarcane production remains suboptimal due to limited integration of biophysical land characteristics into cultivation management. This study aims to assess land characteristics, classify land suitability, identify limiting factors, and provide land management recommendations for sugarcane cultivation. The analysis considered key variables including temperature, rainfall, drainage, soil texture, effective depth, cation exchange capacity (CEC), base saturation, pH (H2O), organic carbon, total nitrogen, available phosphorus (P2O5), available potassium (K2O), slope, erosion risk, and flood risk. Land suitability was evaluated using a matching approach based on the Buku Pedoman Penilaian Kesesuaian Lahan Komoditas Strategis Year 2016. The results showed that actual land suitability comprises class S3 (Marginally Suitable), covering 22.262 ha (64.3%), and class N (Not Suitable), covering 12.342 ha (35.7%). Potential land suitability includes class S2 (Moderately Suitable), covering 8.562 ha (24.7%); class S3, covering 13.701 ha (39.6%); and class N, covering 12.342 ha (35.7%). The main limiting factors identified were temperature, drainage, soil texture, effective depth, nitrogen, phosphorus, base saturation, slope, erosion risk, and flood risk. Recommended management strategies include improving drainage using the Reynoso system, applying dolomitic lime, and SP36 fertilizer. Overall, the Rejoso Watershed demonstrates substantial potential for sugarcane development through improved land management. contributing to national sugar self-sufficiency.
Co-Authors Ani Acfiyatul Fardila Bambang Hermiyanto Cahyoadi Bowo Rifky Putra Verdiawan Saddam Matovani Subhan Arif Budiman Syahrul Efendi Tri Candra Setiawati