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Dedy Prasetyo
Department of Agrotechnology, Faculty of Agriculture, Sebelas Maret University
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Law, Crime, Criminology & Criminal Justice Medicine & Pharmacology Social Sciences Other

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Journal : Journal of Tropical Soils

 1 
Effect of the 32nd-year Soil Tillage and Nitrogen Fertilization on the Population and Biomass of Earthworm under Zea mays L. Prasetyo, Dedy; Imaria, Dwi; Niswati, Ainin; Yusnaini, Sri
JOURNAL OF TROPICAL SOILS Vol. 26 No. 2: May 2021
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2021.v26i2.105-113

Abstract

The abundance and biomass of earthworms are affected by soil tillage and fertilization. This research aimed to study long-term 32nd-year soil tillage and nitrogen fertilization on the population and biomass of earthworms under Zea mays L. The research was conducted using a randomized block design (RBD) which consisted of two factors. The first factor was the soil tillage that was Intensive Tillage (IT), Minimum Tillage (MT), and No-Tillage (NT). The Second factor was nitrogen fertilization that was N0 = 0 kg N ha-1 and N1= 200 kg N ha-1. Data of earthworm population and biomass were tested using analysis of variance and continued with the least significant difference (LSD) test at the 95% significant level. The population and biomass of earthworms at MT or NT were higher than IT. The population and biomass of earthworms in the plots without fertilization were higher than those at 200 kg N ha-1. There was an interaction between the soil tillage and N fertilization on earthworm biomass observed 60 days after planting at a 0-10 cm depth. There was a positive correlation between soil pH and earthworm population and biomass before the tillage phase.
Changes of Soil Chemistry Characteristics of Tephra Mount Anak Krakatau-Indonesia, Through Leaching Experiment Setiawati, Astriana Rahmi; Lumbanraja, Jamalam; Kurnia, Ananda Ika; Hidayat, Manarul; Aini, Septi Nurul; Prasetyo, Dedy
JOURNAL OF TROPICAL SOILS Vol. 28 No. 2: May 2023
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2023.v28i2.57-70

Abstract

Studying the weathering process in pristine volcanic materials is crucial as this process will determine further soil characteristics. Mount Anak Krakatau is reported as one of the fastest-growing volcanoes. This volcano erupted powerfully in December 2018, ejecting tons of volcanic materials. These materials are considered pristine and unweathered tephra. Hence, a leaching experiment can be one of the crucial methods to predict further soil characteristics formed as climatic factors. Tephra sampling was conducted on 13 Augustus 2019 or eight months after the massive eruption of Mount Anak Krakatau in December 2018. Tephra samples were leached by deionized water (H2O), oxalic acid (H2C2O4) 0.02 M, and citric acid (C6H8O7) 0.02 M (solvents) for 90 days. pH of tephra increased approximately from  (3.95– 4.99 ) to (5.12–8.11). Organic-C rose about 0.2 to 1 point higher than organic-C of tephra before the leaching experiment. The increasing value of organic-C was predicted to increase CEC (Cation Exchange Capacity) (2.13–5.36 cmolc kg-1). After the leaching experiment, the tephra’s surface was weathered clearly as an impact of solvents and the growing of algae.
Co-Authors Afandi Afandi Ahmad Yonanda Aini, Septi Nurul Ainin Niswati, Ainin Aisyah, Dhanis Resty Amrizal Arif, M.A. Syamsul arjuana, danang Ashari, Femilia Anggun Dermiyati, Dermiyati Diana Rahmawati Ditia, Jihan Ixora Dwi Kusuma Wahyuni Eva Fatimah Fembriarti Erry Prasmatiwi Gistiani, Twine Levia Harmen Hasan, Vina Sheisya Hasana, Ummi Uswatun Heri setiawan Hidayat, Manarul Imaria, Dwi Jamalam Lumbanraja Kurnia, Ananda Ika Kusumawati, Indah Martinus Minggu, Desiderius Pranata, Andi Yudha Prasetyo, Adnan Dwi Purnomo, Joko Agung RAHMAT GUNAWAN Rahmawanty, Adisty Rika Anggraini Rinawati Rinawati Riszal, Akhmad Riza Alfita Rusdi Evizal Saibun Sitorus Samsi, Intan Maharani Sanjaya, Purba Saputra, Ahmad Reza Sari, Arsita Permata Septiana, Liska Mutiara Setiawati, Astriana Rahmi Setyawan, Nugroho Ari Sri Yusnaini Sucipto Hariyanto Sudi Pramono . Sugiatno Sugiatno Tri Nur Wahyudi