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irfan rifani
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PENGARUH PEMBERIAN DOSIS PUPUK KALIUM DAN MACAM PUPUK KANDANG TERHADAP PERTUMBUHAN DAN HASIL TANAMAN UBI JALAR (Ipomoea batatas L.) irfan rifani
AGRONISMA Vol 8, No 1 (2020)
Publisher : AGRONISMA

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Abstract

This study aims to determine the effect of potassium doses and types of manure on the growth and yield of sweet potato (Ipomea batatas L). In this study using a factorial randomized block design. Factor 1 is a dose of potassium (K) consisting of three levels, namely: K1 = 50 kg.ha- KCl, K2 = 100 kg.ha- KCl, and K3 = 150 kg.ha- KCl. Factor 2 is a type of manure (N) consisting of three levels, namely: N0 = without manure, N1 = cow manure, and N2 = chicken manure. Each treatment was repeated 3 times with samples of each 3 sweet potato plants. The results of this study indicate that the administration of KCl dosage and types of manure do not provide a significant interaction effect on growth, namely plant length, number of leaves, and leaf area as well as yield of sweet potato and KCl dose giving the best growth and yield of sweet potato production at the dose KCl of K3 treatment that is 150 kg.ha- as much as 2744.44 g and the provision of various kinds of manure gave the best growth and yield of sweet potato in N2 fertilizer namely chicken manure as much as 2733.33g.
PENGARUH PEMBERIAN DOSIS PUPUK KALIUM DAN MACAM PUPUK KANDANG TERHADAP PERTUMBUHAN DAN HASIL TANAMAN UBI JALAR (Ipomoea batatas L.) irfan rifani; Abdul Basit; Mahayu Woro Lestari
AGRONISMA Vol. 8 No. 1 (2020)
Publisher : AGRONISMA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study aims to determine the effect of potassium doses and types of manure on the growth and yield of sweet potato (Ipomea batatas L). In this study using a factorial randomized block design. Factor 1 is a dose of potassium (K) consisting of three levels, namely: K1 = 50 kg.ha- KCl, K2 = 100 kg.ha- KCl, and K3 = 150 kg.ha- KCl. Factor 2 is a type of manure (N) consisting of three levels, namely: N0 = without manure, N1 = cow manure, and N2 = chicken manure. Each treatment was repeated 3 times with samples of each 3 sweet potato plants. The results of this study indicate that the administration of KCl dosage and types of manure do not provide a significant interaction effect on growth, namely plant length, number of leaves, and leaf area as well as yield of sweet potato and KCl dose giving the best growth and yield of sweet potato production at the dose KCl of K3 treatment that is 150 kg.ha- as much as 2744.44 g and the provision of various kinds of manure gave the best growth and yield of sweet potato in N2 fertilizer namely chicken manure as much as 2733.33g.
SUATU STUDI TENTANG PARTISIPASI MASYARAKAT DALAM USAHA PELESTARIAN LINGKUNGAN DI DESA KOROLOLAMA KECAMATAN PETASIA KABUPATEN MOROWALI UTARA PROVINSI SULAWESI TENGAH Arief, Dian Vitaduri; Karwur, Hermon Maurits; Poli, Ellen Eva; Grace Feibe Evangelista Suoth; Irfan Rifani
Jurnal Social Science Vol. 13 No. 1 (2025): Juni
Publisher : Fakultas Ilmu Sosial dan Hukum

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53682/jss.v13i1.10153

Abstract

He main research problem is "how is community participation in environmental preservation efforts in the Korololama Village area, District Petasia” The aim of the research is to determine community participation in environmental conservation efforts in Korololama Village. Qualitative research methods, data collection techniques namely observation, documentation and interviews. Sample data collection was carried out purposively sampling and snowball, with research informants namely community leaders, village government and residents totaling 9 informants. The research results show: 1) Forms of community participation in business conservation carried out in Korololama Village, Patasia District, Regency Morowali, Central Sulawesi Province, namely: Taking part in carrying out cleanliness environment, take part in social work to organize the environment, plant trees for reforestation, and provide suggestions regarding conservation and donation efforts monetary donations, 2) factors driving community participation in business conservation is carried out because of the role of community leaders, there are benefits activities, and there is population awareness for environmental preservation, and 3) Business government measures carried out by the government to increase community participation in conservation efforts, namely: providing guidance, motivation and providing funds for environmental conservation activities.
SEISMIC SITE QUALITY ASSESSMENT IN NORTH SUMATRA USING SPECTRAL DENSITY ANALYSIS AND MACHINE LEARNING-BASED CLUSTERING Triya Fachriyeni; Katherin Indriawati; Kevin W. Pakpahan; Irfan Rifani; Anne M. M. Sirait; Yusran Asnawi; Hendro Nugroho; Andrean V. H. Simanjuntak
Jurnal Geosaintek Vol. 11 No. 3 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v11i3.8972

Abstract

Seismic noise strongly influences the accuracy and reliability of earthquake monitoring, particularly in tectonically active regions such as North Sumatra. This study investigates the quality of seismic stations by analyzing noise characteristics using Power Spectral Density (PSD), Probability Density Functions (PDFs), and machine learning clustering. PSD was computed through the Fast Fourier Transform (FFT) and compared against the New High Noise Model (NHNM) and New Low Noise Model (NLNM) benchmarks. Noise variability was further quantified using PDFs, while fuzzy c-means (FCM) clustering was applied to classify temporal noise patterns. Results from the MUTSI seismic station demonstrate strong diurnal and weekly variability, with horizontal components (SHE and SHN) exhibiting significantly higher noise levels and fluctuations than the vertical component (SHZ). Noise amplitudes peaked during morning hours (06:00–09:00 UTC), correlating with anthropogenic activity, and decreased substantially at night, indicating that optimal recording conditions occur during late evening to early morning. FCM clustering identified five dominant noise regimes, separating stable low-noise baselines from sporadic high-noise anomalies likely associated with human activity or instrumental disturbances. These findings highlight the importance of integrating spectral analysis with clustering techniques to evaluate seismic station performance, improve real-time monitoring, and guide optimal site selection and operational scheduling for earthquake detection.
Co-Authors Abdul Basit Andrean V. H. Simanjuntak Anne M. M. Sirait Arief, Dian Vitaduri Ellen Eva Poli Grace Feibe Evangelista Suoth Hendro Nugroho hermon karwur Katherin Indriawati Kevin W. Pakpahan Mahayu Woro Lestari Triya Fachriyeni Yusran Asnawi