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All Journal Jurnal Ilmu Pertanian Indonesia Bioma : Berkala Ilmiah Biologi Planta Tropika JURNAL BIOLOGI INDONESIA Jurnal Biologi Tropis Biosaintifika: Journal of Biology & Biology Education Manilkara: Journal of Bioscience Berita Biologi
Dewi, Tirta Kumala
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Immunology & microbiology Medicine & Pharmacology Neuroscience Veterinary

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MERAH DAN PENGARUHNYA TERHADAP BIOKIMIA TANAH PADA PERCOBAAN POT MENGGUNAKAN TANAH ULTISOL Antonius, Sarjiya; Sahputra, Rozy Dwi; Nuraini, Yulia; Dewi, Tirta Kumala
JURNAL BIOLOGI INDONESIA Vol 14, No 2 (2018): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jbi.v14i2.3744

Abstract

ABSTRACTUltisol dominated about 25% of the total land area in Indonesia. It has the potential to be used as agricultural land and shallot plants have a considerable prospect to be cultivated in ultisol soil.  Ultisol generally has not been handled properly. It needs some specific treatments due to the low nutrient contents, caused by the intensive leaching process. One of the effort to overcome the soil quality problems that occur in ultisol soils (high soil acidity, average pH <4.50, high Al saturation, and low macronutrient content such as P, K, Ca, Mg, and organic material content) is treated by the using the soil conditioner such as the supplying of organic materials in the form of compost and biochar. In this work, the biological organic fertilizer was also applied to increase microorganism activity in the soil. The experimental design used in this work was completely random design which has 8 combinations of soil treatment, compost, biochar and bio-organic fertilizer. Soil parameters measured were pH, C-Organic, P-Available, total bacterial population, soil respiration, and phosphomonoesterase enzyme activity. The agronomy parameters of shallot were also measured. The results showed that treatment of compost, biological organic fertilizer, and biochar have significant effect to increase soil microorganism activity in the form of total population of bacteria, soil respiration, P-Available and pH. The treatment also had a significant effect on supporting plant height at 2 and 6 MST, number of leaves at 2 MST, wet weight and dry weight of tubers. Keywords: biochar, bio-organic fertilizer, soil microorganism activity, shallot, ultisol 
Isolation, Screening and Identification of Plant Growth-Promoting Endophytic Bacteria from Theobroma cacao Simarmata, Rumella; Widowati, Tiwit; Dewi, Tirta Kumala; Lekatompessy, Sylvia J. R.; Antonius, Sarjiya
Biosaintifika: Journal of Biology & Biology Education Vol 12, No 2 (2020): August 2020
Publisher : Department of Biology, Faculty of Mathematics and Sciences, Semarang State University . Ro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/biosaintifika.v12i2.21280

Abstract

Cacao (Theobrama cacao) is one of the main plantation commodities in Indonesia which has an important role for the national economy. The low productivity of cacao plants in Indonesia is due to the condition of old plants, pests and diseases attacks which affect the quality of the fruit and decrease the plant’s productivity. The objective of this study was to isolate and identify of endophytic bacteria from stem, flower, leaf and fruit of T. cacao by using 16S rRNA gene as genetic marker. Twenty seven endophytic bacterial isolates were collected from local plantation in Yogyakarta area.  From this study, 8 endophytic bacterial strains exhibited the higher PGP traits. The isolates produced Indole Acetic Acid level by 0.3 to 5.21 ppm/hour. All of isolates had nitrogen fixation activity but have not phosphate solubilization activity. Among them, isolates CSDT 4 and CGKBH 4 showed promising potential as PGP bacteria. Based on the 16S rRNA gene sequences, those bacterial strains were identified as Brevibacillus brevis (CSDT 4) and Pantoea sp. (CGKBH 4). We propose that the B. brevis and Pantoea sp. which is reported for the first time for their PGP potential in cacao, exerts its beneficial effects on cacao crop through combined of activities. The potential PGP bacteria from the Cacao plant was used to make a specific bio-fertilizer formula for the Cacao plant, because of the different needs and condition that every plant requires.
Isolasi dan Karakterisasi Plant Growth Promoting Rhizobacteria dari Perakaran Kelapa Sawit pada Lahan Gambut Ariyani, Mei Dwi; Dewi, Tirta Kumala; Pujiyanto, Sri; Suprihadi, Agung
Bioma : Berkala Ilmiah Biologi Vol. 23, No 2, Tahun 2021
Publisher : Departemen Biologi, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/bioma.23.2.159-171

Abstract

Peatlands have characteristics of low pH and lack nutrients. Oil palm is the main plant commodity in peatland management. Oil palm roots have been known to be a nutrition source for the growth of soil microbes, especially bacteria around their roots or PGPR. PGPR are a group of bacteria that play an important role in supporting plant growth and health. The purpose of this research was to obtain PGPR potential from oil palm roots which can be used as candidates for biofertilizer agents. In this study, the isolation and selection of PGPR isolate from oil palm roots on oil palm plantations in Central Kalimantan were carried out based on their plant growth-promoting traits, including the activity of producing Indole Acetic Acid (IAA), phosphate solubilizing, N-fixing, K solubilizing, siderophore production, ACC deaminase activity, proteolytic activity, cellulolytic activity, and ligninolytic activity. A total of 17 isolates were selected to be tested for their multiple activities ability. The final results of the PGPR characterization showed that of the seventeen isolates, all isolates had PGPR activity at least three different abilities. From the seventeen isolates, it was found that the SW 5.5 PK 3A isolate had the highest IAA production activity (58,50 ppm), SW 4.10 PK 1A isolate had the highest K solubilizing index (3,16), SW 8.5 PK 1A isolate had both the highest P solubilizing index (3,73) and the highest siderophore zone index (5,20), SW 4.11 PK isolate had the highest proteolytic index (4,80), and SW 4.10 PK 1A.P isolates had the highest cellulolytic index (5,11).
Analisis Kemampuan Produksi Auksin dari Bakteri Endofit dan Plant Growth Promoting Rhizobacteria (PGPR) dalam Akar Cabai Merah Keriting (Capsicum annum L.) Maulida, Nurdalila; Rahmawati, Arrum; Dewi, Tirta Kumala; Simarmata, Rumella; Widowati, Tiwit; Kartika, Titik; Guswenrivo, Ikhsan; Nugroho, Deddy Triyono; Supriatna, Ateng
MANILKARA: Journal of Bioscience Vol 3 No 1 (2024): Agustus
Publisher : LPPM Universitas Terbuka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33830/manilkara.v3i1.9817.2024

Abstract

Endophytic bacteria found in the roots, stems, and leaves of plants have potential as biocontrol agents and drivers of plant development, besides that in plant roots there are also plant growth promoting rhizobacteria (PGPR) with the same ability. The consortium of the two bacteria will produce Indole 3 acetic acid (IAA) compounds which are then converted into auxins that are beneficial to plants. The research aims to determine the ability of endophytic bacteria and PGPR from the roots of curly red chili plants in producing auxin hormones. The research work procedure includes rejuvenation of bacterial isolates, macroscopic and microscopic characteristics, measuring auxin levels using HPLC (High Performance Liquid Chromatography). The results showed that the consortium of 6 bacteria (3 endophytes and 3 PGPR) produced an auxin concentration of 46.122 ppm, a consortium of endophytic bacteria of 24.201 ppm, a consortium of PGPR bacteria of 162.723 ppm, and finally single endophytic bacteria and single PGPR bacteria produced auxin of A 158.913 ppm; B 64.882 ppm; C 93.923 ppm; CB1 240.817 ppm; CB2 186.807 ppm; and CMBC 11.689 ppm, while for the control 0 ppm. In conclusion, the highest auxin concentration was obtained from the single result of PGPR bacteria CB1 240.817 ppm.
The Effect of Arbuscular Mycorrhiza-Enriched Biocompost and Organic Fertilizer in Reducing Heavy Metal Absorption in Shallots Akib, Muhammad Akhsan; Antonius, Sarjiya; Kuswinanti, Tutik; Syatrawati, Syatrawati; Dewi, Tirta Kumala; Sutisna, Entis
PLANTA TROPIKA Vol. 13 No. 1 (2025)
Publisher : Department of Agrotechnology, Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/pt.v13i1.21684

Abstract

Shallots have physiological and pharmacological effects on the human body and have been cultivated intensively using biocompost, which may be contaminated with heavy metals. Enrichment of arbuscular mycorrhizal (AM) fungi in biocompost and the addition of biological organic fertilizer (BOF) to reduce the absorption of heavy metals in shallot bulbs is the main objective of this research. The study used a Randomized Block Design with five treatments, namely: shallots cultivation method by indigenous farmers/control(B0); Dose of biocompost enriched with AM fungi 100kg plot-1(B1); 200kg plot-1(B2); 100kg plot-1+BOF(B3); 200kg plot-1+BOF(B4), has been carried out in Enrekang district, South Sulawesi by observing the components of heavy metal content in plant organs and the level of infection of AM fungi in plant roots. Results showed that a dose of biocompost enriched with AM fungi 200 kg plot-1, and 100kg plot-1+BOF could increase Cr, Cu, and Pb accumulation in roots and leaf, as well as reduce metal accumulation in shallot bulbs, with level AM fungi infection classified as very high. The novelty of this study is that organic fertilizer enriched with AM fungi can reduce the absorption of heavy metals that accumulate in shallot bulbs and is essential information for farmers.
Isolation and Characterization of Propoxur-Degrading Bacteria, Brucella pseudintermedia LED 6 from a Pineapple Plantation in Lampung Hidayat, Taufiq; Widyastuti, Rahayu; Djajakirana, Gunawan; Antonius, Sarjiya; Dewi, Tirta Kumala
Jurnal Ilmu Pertanian Indonesia Vol. 30 No. 4 (2025): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18343/jipi.30.4.725

Abstract

Propoxur is a non-systemic carbamate insecticide that is widely used in Indonesia to control insect pests. However, its persistence and toxicity pose environmental concerns. Bioremediation with bacteria is a viable method for mitigating the detrimental effects of propoxur residues. The goal of this work was to isolate and characterize bacterial strains that can degrade propoxur. Isolation by enrichment culture procedures, utilizing propoxur as the sole carbon source. The isolates' morphological and physiological features were examined, and their degradation potential was determined. Six bacterial samples were isolated from a pineapple plantation in Lampung, Indonesia, and one strain, known as LED 6, showed great potential for propoxur breakdown. Molecular identification with 16S rRNA gene sequencing identified the isolate as Brucella pseudintermedia. Growth characterisation revealed that the isolate performed best at 28 °C and pH 7. After 72 hours of incubation with 500 ppm propoxur, LED 6 had deteriorated around 26% of the starting concentration. Keywords: bioremediation, Brucella pseudintermedia, pineapple, propoxur
Improving Fertilization Efficiency through Biochar Application and the Development of Superior Varieties of Red Chili Peppers Permana, Indra; Intan Nurcahya; Abdul Hakim; Romy Faisal Mustofa; Dewi, Tirta Kumala
Jurnal Biologi Tropis Vol. 24 No. 4 (2024): Oktober - Desember
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v24i4.7937

Abstract

Soil quality improvement can be achieved through the application of soil ameliorants such as Biochar. Developing superior varieties that are efficient in fertilization is also an effort to reduce the use of chemical fertilizers. This study aims to improve fertilization efficiency through the application of Biochar and the development of hybrid large red chili varieties at Siliwangi University. The research method used a Split-split plot design, consisting of large red chili varieties as the main plot, Biochar dosage treatment as the sub-plot, and different doses of inorganic fertilizers as the sub-sub plot. The main plot treatment consisted of four levels: Baja Variety (V1), UNSIL-01 (V2), UNSIL-02 (V3), and UNSIL-03 (V4). The sub-plot had two levels: without Biochar (B0) and 10 tons/ha of Biochar (B1). The inorganic fertilizer treatment consisted of three levels: 25% (P1), 50% (P2), and 75% (P3) of the standard dose. Each treatment was repeated three times, resulting in 72 research plots. The slow pyrolysis of coconut shell produced biochar with an average efficiency of 33.7% based on the dry weight of the feedstock. Optimal pyrolysis conditions, with temperatures ranging between 275°C and 485°C over 6 to 9 hours. Among the tested chili varieties, UNSIL-03 (V4) and Baja (V1) showed the highest growth performance, particularly in height and stem diameter, in biochar-amended soil. The application of 25% of the standard inorganic fertilizer dose, in combination with biochar, was sufficient to achieve optimal plant growth across most varieties, especially Baja (V1) and UNSIL-03 (V4).
POTENSI RHIZOBAKTERI DALAM MENDUKUNG PERTUMBUHAN STEK BATANG SINGKONG (Manihot esculenta Crantz) [The Potential of Rhizobacteria in Supporting the Growth of Cassava (Manihot esculenta Crantz ) Stem Cuttings] Nugroho, Agung Adi; Agustiyani, Dwi; Sutisna, Entis; Mulyani, Nani; Dewi, Tirta Kumala; Nditasari, Achirul; Antonius, Sarjiya; Purwaningsih, Sri
Berita Biologi Vol 22 No 3 (2023): Berita Biologi
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/beritabiologi.2023.120

Abstract

Cassava (Manihot esculenta Crantz) is an important food plant in Indonesia, particularly as a carbohydrate source. We require a plan to increase production and quality. The use of Plant Growth Promoting Rhizobacteria (PGPR) in organic fertilizers is one option. The aim of this study is to isolate, characterize, and evaluate potential microbial candidates for cassava greenhouse growth. K solubilizing, P solubilizing, N fixing, IAA production, protease production, ACC-deaminase, and siderophore production were investigated in 15 tuber root rhizobacteria isolates. The bacterial isolates' ability to grow cassava stem cuttings was then assessed. The rhizobacterial inoculation treatments in this study included fifteen single isolates, a combination of isolates, and controls. With three replications, the experimental design was completely randomized. Five P-solubilizing bacterial isolates (PK AL.2.2, PK LAS 4A.4, PK 4.1, PK Al.2.6, PK Kbm 6.1), two protease-producing isolates (Pro LAS 4B.6 and Pro LAS 5A.3), and one IAA-producing isolate (TSB LAS 1A.6) increased wet plant weight by 20-41% as compared to controls. The results of molecular identification of the six excellent isolates were Burkholderia sp. (PK AL.2.2), Paenarthrobacter nicotinovorans (Pro LAS 4B.6), Burkholderia territorii (PK 4.1), Burkholderia cenocepacia (Pro LAS 5A.3), Burkholderia territorii (PK LAS 4A.4), and Kocuria rhizophila (TSB LAS 1A.6).
Co-Authors Abdul Hakim Achirul Nditasari Agung Adi Nugroho, Agung Adi Akib, Muhammad Akhsan Ariyani, Mei Dwi Ateng Supriatna Dwi Agustiyani Entis Sutisna Gunawan Djajakirana Guswenrivo, Ikhsan Hapzi Ali Indra Permana, Indra Kartika, Titik Lekatompessy, Sylvia J. R. Maulida, Nurdalila Mulyani, Nani Mustofa, Romy Faisal Nugroho, Deddy Triyono Nurcahya, Intan RAHAYU WIDYASTUTI Rahmawati, Arrum Rumella Simarmata, Rumella Sahputra, Rozy Dwi Sarjiya Antonius Sri Pujiyanto Sri Purwaningsih Syatrawati Taufiq Hidayat Tiwit Widowati, Tiwit Tutik Kuswinanti Yulia Nuraini