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All Journal Journal of Tropical Soils Berkala Ilmiah Pertanian Agrovigor: Jurnal Agroekoteknologi Techno: Jurnal Penelitian Journal of Degraded and Mining Lands Management Jurnal Agro Jurnal Penelitian Pendidikan IPA (JPPIPA) Martabe : Jurnal Pengabdian Kepada Masyarakat PengabdianMu: Jurnal Ilmiah Pengabdian kepada Masyarakat Menara Perkebunan J-Dinamika: Jurnal Pengabdian Kepada Masyarakat Jurnal Pengabdian Masyarakat IPTEKS Jurnal Bioindustri Journal of Applied Agricultural Science and Technology Journal of Soilscape and Agriculture Warta LPM Jagur: Jurnal Agroteknologi Journal of Bioindustry
Tri Candra Setiawati
Department Of Soil Science, Faculty Of Agriculture, The University Of Jember Jl. Kalimantan 37, Jember-68121
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Physics Public Health Social Sciences

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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)
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.  
Influence of Light and Humidity on Infection Dynamics of Potential Entomopathogenic Fungus Against Spodoptera frugiperda Ambar Susanti; Suharto Suharto; Hardian Susilo Addy; Tri Candra Setiawati
Journal of Applied Agricultural Science and Technology Vol. 10 No. 3 (2026): Journal of Applied Agricultural Science and Technology
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55043/jaast.v10i3.591

Abstract

The effectiveness of entomopathogenic fungi (EPF) in suppressing insect pests is strongly influenced by environmental conditions, particularly light exposure and relative humidity. This study evaluated the effects of ambient light and relative humidity on the pathogenicity and infection dynamics of Simplicillium lanosoniveum against Spodoptera frugiperdalarvae. A completely randomized design factorial 2 x 2 was used, with light exposure (ambient light under open and dark under enclosed conditions) and relative humidity (45% RH and 80% RH) factors.  Second–third instar larvae were inoculated with EPF, and each treatment included 25 individually reared larvae, arranged into five biological replicates of five larvae each, with each larva maintained in a separate. Larval mortality was recorded daily for 10 days and analyzed using a generalized linear model (GLM) with a binomial distribution. Ambient light exposure, relative humidity, and their interaction had no statistically significant effects on larval mortality (p > 0.05). Goodness-of-fit statistics indicated that the model adequately fit the data, with deviance and Pearson chi-square values close to unity. Numerically, the highest mortality (92%) and the shortest median lethal time (LT₅₀ = 6.4 days) were observed under dark conditions at 80% RH, whereas the lowest mortality (72%) and the longest LT₅₀ (8.3 days) occurred under ambient light at 45% RH Although the observed numerical pattern suggested a tendency toward faster infection under higher humidity, it was not statistically significant. Overall, S. lanosoniveum maintained relatively stable pathogenicity across the tested environmental conditions, indicating its potential for development as a biological control agent against S. frugiperda.
Co-Authors Aisyah Valentini Sonia Almansyah Nur Sinatrya Ambar Susanti Arie Mudjiharjati Bambang Hermiyanto Bambang Hermiyanto Basuki Basuki, Basuki Farida Wahyu Ningtyias, Farida Wahyu HARDIAN SUSILO ADDY I Gusti Bagus Wiksuana I Indasah Indah Nurul Safitri Jayus Jayus Kartika Sholehatin Laily Mutmainnah Marinus H Pandutama Millatuz Zahroh, Millatuz Moh. Hasan Mohammad Jimmy KURNIATA NIKEN SULISTYANINGSIH Raden Soedradjad Rendy Anggriawan Rifky Putra Verdiawan Saddam Matovani Salsabila Alifia Widinda Sari, Retno Purnama Sari Sherly Meirdania Lestari Sigit PRASTOWO Sigit Soeparjono Sugeng Winarso Sugeng Winarso Suharto Suharto Sukron Romadhona Syahrul Efendi Taufik Kurrohman Tiara Rizky Oceananda Suharto Wachju Subchan Wachju Subchan Wiwik Hartatik