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All Journal Jurnal Silvikultur Tropika (JST) Jurnal Ilmu Tanah dan Lingkungan (Journal of Soil Science and Environment) Reaktor Sains Tanah Jurnal Sumberdaya Lahan Jurnal Tataloka SAINS TANAH - Journal of Soil Science and Agroclimatology Journal of Regional and Rural Development Planning Soil REns Jurnal Sumberdaya Lahan Jurnal Tanah dan Iklim

Darmawan

Departemen Ilmu Tanah Dan Sumberdaya Lahan Institut Pertanian Bogor, Jalan Meranti Kampus IPB Dramaga Kab. Bogor 16680 Indonesia

Author-ID : 2548767

Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Environmental Science Materials Science & Nanotechnology Social Sciences

Published : 15 Documents Claim Missing Document

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Karakteristik Andisol Berbahan Induk Breksi dan Lahar dari Bagian Timur Laut Gunung Gede, Jawa Barat Muhammad Giri Wibisono; Sudarsono Sudarsono; Darmawan Darmawan
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) Vol 40, No 1 (2016)
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v40n1.2016.61-70

The Potential Of Nickel Slag with Humic Substance Addition as Ameliorating Materials on Gajrug Red-Yellow Podzolic Febrianti Rosalina; Dyah Tjahyandari; Darmawan Darmawan
SAINS TANAH - Journal of Soil Science and Agroclimatology Vol 15, No 1 (2018): June
Publisher : Universitas Sebelas Maret

Nickel slag and humic substance have a strong potential for use as soil ameliorants in land remediation, owing to their chemical properties that can improve acidic soils. This study aimed to determine their effect on red-yellow podzolic soil. This greenhouse incubation study used a 2-factorial completely randomized design. Factor 1 was nickel slag at 4levels (0, 8, 12, and 16 ton ha-1), while Factor 2 was humic substance at 3 levels (0, 15, and 30 litre ha-1), with 3 replications. Statistical analysis of the data used analysis of variance, and whenever a significant difference was detected, further verification was tested using Duncan’s Multiple Range Test at a level of significance (α) of 5%. The results showed that the application of nickel slag and humic substance can increase the values of pH, total-N, available-P, and exchangeable-Mg of the red-yellow podzolic soil, but also decreased exchangeable-H. The interactive effects of nickel slag and humic substance can raise soil K-exchangeable only. The levels of heavy metals (Pb, Cd and As) in the soil after the application of nickel slag and humic substance remain within normal limits that is, they are environmentally safe for use as a soil ameliorant

Characteristics of Biochars from Plant Biomass Wastes at Low-Temperature Pyrolysis Liska Mutiara Septiana; Gunawan Djajakirana; Darmawan Darmawan
SAINS TANAH - Journal of Soil Science and Agroclimatology Vol 15, No 1 (2018): June
Publisher : Universitas Sebelas Maret

The effects of biochar as soil ameliorants depend on their characteristics that are influenced by the variation in biomass origin and pyrolysis process. In this context, the objective of this study was to determine the chemical and physical characteristics of seven biochar derived from different biomass wastes - rice husk, corn cob, empty oil palm fruit bunch, bagasse, and sawdust of albazia (Albizzia falcataria), maesopsis (Maesopsis eminii), and mahogany (Swietenia macrophylla) at two low-pyrolysis temperatures (250 and 350 oC). The results showed that the percentage of biochar yield decreased at higher temperature level. However, the increased thermal decomposition of plant biomass wastes (at 350 oC) resulted in higher pH, as well as ash, C, N content of the biochar; but it did not significantly affect nutrient availability. Biochar from wood waste had more C and Ca content. Biochar from rice husk produced the highest ash content, while biochar from empty oil palm fruit bunch yielded the highest pH value, and possessed more nutrients than all the others. Increasing pyrolysis temperature from 250 to 350 oC resulted in greater biochar surface area and total pore volume but produced smaller average pore radius.

Nutrient Release Performance of Starch Coated NPK Fertilizers and Their Effects on Corn Growth Nur Izza Faiqotul Himmah; Gunawan Djajakirana; Darmawan Darmawan
SAINS TANAH - Journal of Soil Science and Agroclimatology Vol 15, No 2 (2018): December
Publisher : Universitas Sebelas Maret

One way to control or slow down the nutrient release rate from fertilizer is by coating technique. Nowadays the use of biodegradable coating materials for slow-release fertilizer (SRF) is preferable because of environmental issues. This research was aimed to make SRF using starches and cellulose as the coating materials and to test the release rate of the nutrients. Five kinds of starches (cassava, corn, sago, wheat, and glutinous rice) and carboxymethyl cellulose (CMC) were used as coating material for granulated NPK fertilizer. The coated fertilizers (NPK SRF) were tested for their leaching rate in the soil by percolation experiment. The results showed that the kind of starch used influenced the release rate of the NPK SRFs. The NPK SRF coated with sago starch exhibited slow release rate and low leached nutrients which also resulted in slow growth of corn plant, as expected of SRF. The use of starch and CMC as biodegradable coating materials in this research has a possibility to affect the microbial activity in the soil so that the nutrient release became faster than the uncoated NPK fertilizer.

The Role of Terraced Paddy Fields and Its Critical Issues in Sustaining a Mountainous Tropical Monsoon Rural Community: Case Study of Malasari Village, Bogor Regency, Indonesia Kenta Tsuchiya; Ernan Rustiadi; Darmawan; Shinya Funakawa
Journal of Regional and Rural Development Planning (Jurnal Perencanaan Pembangunan Wilayah dan Perdesaan) Vol. 5 No. 2 (2021): Journal of Regional and Rural Development Planning (Jurnal Perencanaan Pembangu
Publisher : P4W LPPM IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jp2wd.2021.5.2.91-100

Terraced paddy fields play an important role not only in the food production function, but also in flooding control, water source recharge, and soil erosion and landslide prevention in mountainous area. Abandonment has been occurring in many countries due to natural condition climate, low-productive, less economic condition, depopulation, aging, and poor work efficiency. However, the terraced fields in Malasari village, Bogor Regency are relatively sustained and constantly maintained by traditional local farmers. Therefore, this study aims to seek keys to how to maintain of the terraced paddy fields by local farmers in Malasari village. The survey was conducted from October 2019 to January 2020 on Malasari village (6°40’S and 106°31’E) by using primary and secondary data with a sample of 28 households. Questionnaire survey was conducted to elicit primary data on farmer’s basic information. Verification of land cover in Malasari village was carried out by visual interpretation land cover in images obtained from drone image in 2019. The terraced paddy fields have been maintained by local farmers contentiously. Two factors are discovered maintained the terraced paddy fields, namely: (1) the local wisdom technique is an act that has direct influences on the physical structure of terraced paddy fields for maintaining, especially land management which is plowing and making levee are playing an important role, and (2) social capital is an act that has indirect influences on the terraced paddy fields. These factors interact with each other to maintain the terraced paddy fields.

Co-Authors Apong Sandrawati Baba Barus Boedi Tjahjono Budi Mulyanto Cahyana, Destika Destika Cahyana Dyah Tj. Suryaningtyas Dyah Tjahyandari Dyah Tjahyandari Suryaningtyas Ernan Rustiadi Gunawan Djadjakirana Gunawan Djajakirana Gusti Z. Anshari Iis Rismawati Iskandar Iskandar Juniska Muria Sariningpuri Kenta Tsuchiya Muhaimin Muhaimin Muhammad Giri Wibisono Nur Izza Faiqotul Himmah Nuri Nursjahbani Nuriman, Muhammad Omo Rusdiana Permana, Mirza Rosalina, Febrianti Santun R.P Sitorus Santun Risma Pandopatan Sitorus Septi Nurul Aini Septiana, Liska Mutiara Shinya Funakawa Sudarsono Sudarsono Yiyi Sulaeman

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