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All Journal Agrotrop : Journal on Agriculture Science International Journal of Biosciences and Biotechnology Journal of Degraded and Mining Lands Management
NI NENGAH SONIARI
Program Studi Agroekoteknologi Fakultas Pertanian Universitas Udayana Jl. PB. Sudirman Denpasar 80362 Bali
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Environmental Science

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Pengaruh Dosis Urea terhadap Jerapan Ammonium dan Nitrat pada Biochar Sekam Chandra, Kartika Ferina; Kesumadewi, A.A. Istri; Soniari, Ni Nengah
Agrotrop : Journal on Agriculture Science Vol 14 No 1 (2024)
Publisher : Fakultas Pertanian Universitas Udayana

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Abstract

Effect of Urea Dosage on Ammonium and Nitrate Absorption by Rice Husk Biochar. Biochar is a biological charcoal which is rich in carbon and functional groups, thus it capable to absorb nutrients including nitrate and soil ammonium which comes from ammonification and nitrification of urea. Activated rice husk biochar enriched with urea doses of 0:100, 50:50; 25:75 (percentage of biochar:urea; w/w) was tested for its ability to adsorb ammonium and nitrate through laboratory research. Each measurement was carried out weekly from 0-35 days with 3 replications. The results showed that the activated rice husk biochar able to absorb ammonium. Higher absorption was obtained in urea treatment with higher doses, namely 75 and 100% urea. A better incubation time to enrich rice husk biochar was 14 days for urea levels of 50 or 75%. The optimal ammonium uptake for the 50% urea + 50% rice husk biochar treatments were 489.83 mg.kg-1 and 482.80 mg.kg-1 for the 75% urea + 25% rice husk biochar treatment. The absorbed nitrate levels in the two treatments were 251.85 and 189.62 mg.kg-1 respectively. These findings can be a reference for determining the time needed to enrich rice husk biochar with urea to reduce the potential loss of nitrogen from urea hydrolysis. It is recommended to study activation materials that are more environmental-sound and determine the optimal proportions of urea and biochar in biochar.
Pengaruh Jenis Biochar dan Kompos terhadap Aktivitas Mikroorganisme Tanah Soniari, Ni Nengah; Sutari, Ni Wayan Sri; Pradnyawathi, Ni Luh Made
Agrotrop : Journal on Agriculture Science Vol 13 No 3 (2023)
Publisher : Fakultas Pertanian Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/AJoAS.2023.v13.i03.p08

Abstract

The Effect of Biochar Types and Compost on Soil Microorganism Activities. This research was carried out at the plastic house of Pasraman Unud Jimbaran from January to June 2021. The type of biochar used come from waste materials such as bamboo, rice husks, coconut shells, and corn cobs, while the compost was selected according to Indonesian National Standards. The purpose of this study was to determine the biochar material from several wastes combined with compost in supporting the activity of soil microorganisms as well as the N, P, K, pH and C-organic soil. The experimental design used in this study was a Simple Completely Randomized Design with 9 treatments and 3 replications so that it became 27 experimental units. The experimental treatments consisted of: B0 (control); B1 (1.5% rice husk biochar/ha); B2(1,5% biochar bamboo/ha); B3 (1.5% corncob biochar/ha); B4 (1.5% coconut shell biochar/ha); B5 (0.75% rice husk biochar + 0.75% compost)/ha; B6 (0.75% bamboo biochar + 0.75% compost)/ha; B7 (0.75% corncob biochar + 0.75% compost)/ha; B8 (0.75% coconut shell biochar + 0.75% compost/ha). Monitoring of media humidity is carried every 2 days and stirring once a week. Observations were made at the end of the incubation period (35 days) on soil respiration, C-organic, N-total and pH. The results showed that the highest activity of microorganisms occurred in the B6 treatment (0.75% bamboo biochar + 0.75% compost)/ha. The addition of (biochar + compost) to the soil gave a significantly different effect on organic C and total soil N.
Evaluasi Kualitas Tanah dan Arahan Pengelolaan Tanah Sawah Berbasis Sistem Informasi Geografis di Kecamatan Sidemen Silitonga, Septia Ningsih; Arthagama, I Dewa Made; Soniari, Ni Nengah
Agrotrop : Journal on Agriculture Science Vol 14 No 1 (2024)
Publisher : Fakultas Pertanian Universitas Udayana

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Evaluation of Soil Quality and Directions for Paddy Field Management Based on Geographic Information Systems in Sidemen District. Soil quality assessment is a crucial component of agricultural land management, as it provides valuable information about the condition of soil and its limiting factors, which in turn influences crop productivity and sustainability. Understanding the quality of soil is essential for making informed decisions related to land management practices, such as fertilization, irrigation, and crop rotation, to optimize agricultural production and protect the environment. The research was conducted in agricultural lands Sidemen District, Bali Province. The aim of the study was to analyse the physical, chemical, and biological factors to evaluate the spatial distribution of soil quality. Method for this research is integrated for Geographic Information System, field survey, laboratory soil analysis, and quantification soil quality based on Lal (1994). Soil quality indicators, such as soil texture, unit weight, porosity, moisture content, field capacity, pH, C-organic, CEC, base saturation, nutrients (N, P, and K), and C-biomass, were measured as a minimum data set (MDS). This study showed that the soil quality have a moderate to good category. The limiting factors in the study area encompassed texture, water content, N, P, and C-biomass. The proposed land management recommendations include utilizing tractors and implementing organic fertilizers, urea, and SP-36 in the paddy fields of the Sidemen District.
Exploring soil erodibility: integrating field surveys, laboratory analysis, and geospatial techniques in sloping agricultural terrains Soniari, Ni Nengah; Trigunasih, Ni Made; Sumarniasih, Made Sri; Saifulloh, Moh
Journal of Degraded and Mining Lands Management Vol. 12 No. 1 (2024)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2024.121.6533

Abstract

The escalating trend of land degradation poses a significant challenge, especially in sloping agricultural terrains, driven by the increasing global demand for food and the limited availability of flat arable land. In response to these challenges, farmers are compelled to shift their focus towards cultivating sloping terrains. This research aimed to employ a comprehensive methodology that integrates on-site field surveys, meticulous laboratory soil analyses, and geospatial data for mapping soil erodibility. The parameters under scrutiny encompass various crucial aspects, including soil texture (ranging from coarse sand to very fine sand, silt, and clay), soil structure, organic matter content, and permeability. The meticulous examination of these factors serves as the foundation for calculating soil erodibility, utilizing the well-established Wischmeir and Smith formula developed in 1978. The research findings present a nuanced understanding of soil erodibility in the study location, revealing a spectrum spanning low to very high erodibility. Specific units, such as Unit 1, Unit 2, Unit 3, Unit 7, Unit 9, Unit 10, Unit 13, and Unit 16, exhibit very low to low erodibility. In contrast, Unit 4, Unit 6, Unit 14, and Unit 15 showcase moderate erodibility, while units like Unit 5, Unit 8, Unit 11, Unit 12, Unit 17, and Unit 18 are characterized by moderately high to very high erodibility. These insightful results shed light on the diverse erodibility levels within the studied locations and provide valuable guidance for formulating sustainable land management practices.
Number and Activity of Microorganisms in Organic and Conventional Soil in Subak Blongyang Tabanan, Bali, Indonesia Avianto, Rio Jonathan; Kartini, Ni Luh; Soniari, Ni Nengah
International Journal of Biosciences and Biotechnology Vol 11 No 1 (2023): International Journal of Biosciences and Biotechnology
Publisher : Central Laboratory for Genetic Resource and Molecular Biology, Faculty of Agriculture, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/IJBB.2023.v11.i01.p05

Abstract

Microorganisms are most broadly used as an indicator of soil fertility and quality. Organic farming is an agricultural technique that does not use synthetic pesticides or fertilizers, believed to be a solution to the negative impacts of conventional farming systems. This study aimed to compare soil microbial numbers and activities in organic and conventional paddy fields and determine their influencing factors in Subak Blongyang, Tabanan, Indonesia. The research methods comprised literature study, field survey, soil sampling, and soil analysis in the laboratory, with soil respiration as a measure of microbial activity. Afterward, the data derived were tabulated and analyzed descriptively. Results show that the total microorganisms (19.16x106 cfu/g) and soil respiration (8.58 mgC-CO2/kg/day) in organic paddy fields were higher than in samples collected from conventional paddy fields (2.46 x106 cfu/g; 5.82 mgC-CO2/kg/day). Similarly, the laboratory tests of various supporting variables indicate that soils in the former were always more favorable for microbial growth and activities than the latter, as seen from total-N, organic-C, organic matter, C/N ratio, and soil pH.
Co-Authors Avianto, Rio Jonathan Chandra, Kartika Ferina I DEWA MADE ARTHAGAMA Kesumadewi, A.A. Istri moh saifulloh, moh Ni Luh Kartini NI LUH MADE PRADNYAWATHI NI MADE TRIGUNASIH Ni Wayan Sri Sutari Silitonga, Septia Ningsih SUMARNIASIH, MADE SRI