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All Journal Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Jurnal Ilmu Pertanian Indonesia Jurnal Ilmu Tanah dan Lingkungan (Journal of Soil Science and Environment) Journal of Tropical Soils Biota: Jurnal Ilmiah Ilmu-Ilmu Hayati Jurnal Tanaman Industri dan Penyegar JTSL (Jurnal Tanah dan Sumberdaya Lahan) Journal of Degraded and Mining Lands Management MAJALAH ILMIAH GLOBE SAINS TANAH - Journal of Soil Science and Agroclimatology Caraka Tani: Journal of Sustainable Agriculture Jurnal Penelitian Kelapa Sawit Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Jurnal Entomologi Indonesia Jurnal Tanah dan Iklim BIOVALENTIA: Biological Research Journal

Gunawan Djajakirana

Departemen Ilmu Tanah Dan Sumber Daya Lahan, Fakultas Pertanian, IPB University, Kampus IPB Darmaga Bogor 16680

Author-ID : 2546177

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Economics, Econometrics & Finance Education Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Medicine & Pharmacology

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ANALISIS DAERAH RAWAN KEBAKARAN HUTAN DAN LAHAN DALAM PENATAAN RUANG DI KOTA PALANGKA RAYA, PROVINSI KALIMANTAN TENGAH Mapilata, Eko; Gandasasmita, Komarsa; Djajakirana, Gunawan
MAJALAH ILMIAH GLOBE Vol 15, No 2 (2013)
Publisher : Badan Informasi Geospasial

Di Kota Palangka Raya, kejadian kebakaran hutan dan lahan merupakan kejadian yang hampir terjadi setiap tahun pada musim kemarau. Kondisi ini mengakibatkan kerusakan dan kerugian ekonomi, sosial dan lingkungan yang akan menghambat laju pembangunan dan pengembangan wilayah Kota Palangka Raya. Tujuan utama penelitian ini adalah mengidentifikasi daerah rawan kebakaran hutan dan lahan berdasarkan lokasi kebakaran dan faktor-faktor yang mempengaruhi kebakaran hutan dan lahan. Daerah rawan kebakaran hutan dan lahan digunakan sebagai bahan masukan dan pertimbangan dalam upaya pencegahan kebakaran hutan dan lahan. Berdasarkan analisis regresi logistik, aktivitas manusia merupakan faktor utama yang mempengaruhi kejadian kebakaran hutan dan lahan. Secara spasial aktivitas manusia terdiri atas: jarak dari jalan, tutupan lahan dan kepadatan penduduk. Composite Mapping Analysis (CMA) digunakan untuk memetakan daerah rawan kebakaran hutan dan lahan berdasarkan lokasi kebakaran dan faktor-faktor yang mempengaruhi kebakaran hutan dan lahan. Hasil analisis daerah rawan kebakaran hutan dan lahan menggunakan CMA dengan tiga variabel yang mempengaruhi kebakaran hutan dan lahan menghasilkan akurasi model sebesar 80,00% dengan luas daerah dengan tingkat kerawanan tinggi seluas 33.824 ha. Pada akhirnya, pemanfaatan lahan pada daerah rawan kebakaran hutan dan lahan dengan tingkat kerawanan tinggi memerlukan pengelolaan ruang atau adaptasi teknologi dalam upaya pencegahan kebakaran hutan dan lahan.Kata Kunci: Kebakaran Hutan dan Lahan, Daerah Rawan, Penataan Ruang.ABSTRACTIn the city of Palangka Raya, land and forest fires is an event that occurred almost every year during the dry season. These conditions resulted in damage and economic loss, socially and environmentally that will inhibit the rate of development and regional development in Palangka Raya City. The main objective of this study is to identify land and forest fires hazard zonation based on fire location and the factors that influence the occurrence of land and forest fires. Land and forest fires hazard zonation is used as an input and consideration in land and forest fire prevention. Base on logistic regression analysis, human activites are the main factor that influence the occurrence of land and forest fires. Spatially human activities consisted of distance from the road, land cover and population density.Composite Mapping Analysis (CMA) is use to map the hazard zonation of land and forest fire based on fire location and factors that influence land and forest fires. The results of the analysis of land and forest fire hazard zonation using CMA with three variables that influence land and forest fires produce model accuracy by 80 % with high hazard area covering 33.824 ha. In the final result of the area to be cultivated in land and forest fires hazard zonation with high hazard area requires spatial management or adaptation of technology to make the area as intended in an effort to prevent land and forest fires.Keyword: Land and Forest Fires, Hazard Zonation, Spatial Planning.

The Diversity and Abundance of Springtail (Collembola) on Forests and Smallholder in Jambi Widrializa, .; Widyastuti, Rahayu; Santosa, Dwi Andreas; Djajakirana, Gunawan
JOURNAL OF TROPICAL SOILS Vol 20, No 3: September 2015
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2015.v20i3.173-180

Harapan forests is the first restoration forest in Indonesia, includes several different ecosystems. Different ecosystems have different characteristic to affect the diversity and abundance of Collembola. In the ecosystem, Collembola have an important role in biocontrol, decomposition, soil nutrient distribution, stimulation of soil microbial activity and as an alternative feed for predators. This study was aimed to investigate the diversity and abundance of Collembola in four ecosystems at Harapan forest, i.e. secondary forest, rubber forest, rubber smallholder and oil palm smallholder. To achieve the objective, soil samples were taken at 48 observation points in the four ecosystem. The soil samples were then extracted by Kempson Extractor. The diversity and abundance of Collembola in four ecosystems were categorized as medium to high. The total of individual and population of Collembola in the secondary and rubber forest ecosystems were likely to be higher than in the rubber and oil palm smallholders. This study had also identified four orders, 14 families and 31 genera of Collembola, where Isotomiella and Proisotoma dominated the genus of Collembola in the four ecosystems. [How to Cite: Widrializa, R Widyastuti, DA Santosa and G Djajakirana. 2015. The Diversity and Abundance of Springtail (Collembola) on Forests and Smallholder in Jambi. J Trop Soils 20: 173-180. Doi: 10.5400/jts.2015.20.3.173]Â

Metode-Metode Penetapan Biomassa Mikroorganisme Tanah secara Langsung dan Tidak Langsung: Kelemaahn dan Keunggulannya(Direct and Indirect Methods of Soil Microbial-Biomass Determination: Weakness and Strength) Gunawan Djajakirana
Jurnal Ilmu Tanah dan Lingkungan Vol 5 No 1 (2003): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

Dalam dua dasawarsa terakhir ini telah terjadi peningkatan minat para pakar ilmu tanah dan lingkungan dalam menentukan jumlah total mikroorganisme dalam contoh tanah. Minat tersebut muncul karena para pakar menyadari pentingnya peranan mikroorganisme tanah di dalam berbagai proses biokimia yang terjadi di dalam sistem tanah, proses retensi dan pelepasan hara serta energi dalam tanah. Setiap usaha untuk menentukan aliran hara dan energi dalam sistem tanah harus mempertimbangkan peranan dari mikroorganisme tanah.

ISOLASI DAN UJI AKTIVITAS BAKTERI ASIDOFILIK PENGOKSIDASI BESI DAN SULFUR DAR! EKOSISTEM AIR HITAM DI KALIMANTAN TENGAH Nurseha Nurseha; Gunawan Djajakirana
Jurnal Ilmu Tanah dan Lingkungan Vol 6 No 2 (2004): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

The acidophilic iron and sulfur-oxidizing bacteria were isolated from the black water ecosystem, an 'extreme' ecosystem affected indirectly or directly by peatland Isolation and selection were done on minimal media (liquid and solid). All selected strain of bacteria (BB 179, OM 349, AH 41, TB 23, TB 27, TP 3, NN 323, and SI 188) were identified as Thiobacillus ferrooxidans. Biooxidation and bio-leaching tests were accomplished using the isolated bacteria. The results showed the capability of the isolated bacteria to oxidize ferrous-salt and to leach the low qualities of sulfide ores. Keywords: Acidophilic, bioleaching, biooxidation, Thiobacillus ferrooxidans

Potensi Limbah Tahu untuk Menghasilkan Listrik pada Tiga Model Sistem Microbial Fuel Cell (MFC): Tofu Wastewater Potency for Generating Electricity Using Three Models of Microbial Fuel Cell (MFC) Amanda Kusuma Dewi; Gunawan Djajakirana; Dwi Andreas Santosa
Jurnal Ilmu Tanah dan Lingkungan Vol 22 No 1 (2020): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitl.22.1.29-34

Organic waste from tofu industries in general is only thrown into the surrounding river flow and not utilized by the community. Tofu liquid waste contains a lot of protein, so in the decomposition process it produces ammonia which is causes odor. A lack of researchers who understand that tofu waste can also be used as a substrate in Microbial Fuel Cells (MFC). MFC is a system or device that uses bacteria as a catalyst to oxidize organic and inorganic materials. Electrons are produced by bacteria from the substrate which is transferred to the anode (negative pole) and flowed to the cathode (positive pole), then connected by conductivity devices including resistors or operated under charge to produce electricity. The purpose of this study were knowing the effect of using tofu waste as a substrate in the anode on electric currents in MFC also knowing the most effective MFC modeling and providing electricity with the highest current. The result showed that MFC modeling which is considered the most effective and produces the highest voltage is the dual chamber system with Nafion. MFC dual chamber with Nafion isolate Staphylococcus saprophyticus was able to produce a voltage value of 3.74x105 mV and a power density value of 2.87x104 mW m-2.

Pengaruh Penambahan Kompos Kotoran Sapi dan FABA Terhadap Karakteristik Kimia pada Tanah Berpasir dan Pertumbuhan Tanaman Tomat: The Effect of Cow Manure Compost and Fly Ash-Bottom Ash (FABA) Addition on the Chemical Properties of Sandy Soil and Tomato Growth Nurul Faoziah; Iskandar; Gunawan Djajakirana
Jurnal Ilmu Tanah dan Lingkungan Vol 24 No 1 (2022): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitl.24.1.1-5

Sandy soil has a low: ability of water retention, aggregate stability, and nutrient content. To improve its quality a mixture of compost and fly ash-bottom ash (FABA) need to be added to this soil. This study was aimed to determine the effect of compost and FABA as an ameliorant on the chemical properties of sandy soil and plant growth of tomato (Solanum lycopersicum). The pot experiment was carried out at Cikabayan Greenhouse, IPB University using a Completely Randomized Design with seven treatments and two replications. Each 5 kg of sandy soil per pot were mixed with cow manure compost and FABA at various doses. The test plant was tomato variety SL 975. Parameters of soil chemical properties were observed for organic-C, total N, available P, CEC, and exchangeable bases. Plant growth was observed at five weeks after planting (WAP). The A6 treatment, i.e. addition of 1,950 gram compost pot-1 and 25 gram FABA pot-1, showed the highest organic-C content in the soil (3.83%) as well as the plant height, leaf number, and fresh weight by 54.4 cm, 21 sheet, and 68.7 gram.

Respons Benih Kakao Terhadap Amelioran, Mikrob Pelarut Fosfat, dan Pupuk Fosfat pada Tanah Masam Kurnia Dewi Sasmita; Iswandi Anas; Syaiful Anwar; Sudirman Yahya; Gunawan Djajakirana
Jurnal Tanaman Industri dan Penyegar Vol 7, No 1 (2020): Jurnal Tanaman Industri dan Penyegar
Publisher : Pusat Penelitian dan Pengembangan Perkebunan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jtidp.v7n1.2020.p39-52

The growth of cacao in acid soils is commonly limited by some problems such as low available P and pH, and high Al saturation. Therefore, research is needed to solve the problem of coffee cultivation in acid soil. This study aimed to determine the effect of ameliorant, phosphate solubilizing microbes (PSM), and phosphate fertilizers (P) on the growth and nutrient uptake of cacao seedlings, and some acid soil properties. The study used a randomized block design with 3 factors and 3 replications. The first factor was ameliorant applications (without ameliorant, 10% organic fertilizer, 4% rice husk biochar, 4% rice husk biochar + 10% organic fertilizer). The second factor was PSM applications: without PSM, Burkholderia ambifaria (BPF) inoculants, and Aspergillus niger (FPF) inoculants. The third factor was P fertilizers applications (without Phosphate Rock (PR), 100, 200, and 400 mg P/kg of PR, and 400 mg P/kg of SP-36). The results showed that the applications of 4% rice husk biochar + 10% organic fertilizer + BPF or FPF inoculants increase the number of leaves by 77.9% and 69.2%, respectively, and increase the dry weight of shoot by 93.6 % and 101.9%, respectively. Phosphate rock application in media without organic fertilizer increases dry weight of shoots and roots of cacao seedlings, and the uptake of P, Ca, and Mg in shoots linearly in line with the increase of PR dose to 400 mg P/kg. Application of rice husk biochar significantly increased the acid phosphatase activity of growing media. Meanwhile, organic fertilizer increased the soil pH, acid phosphatase and available P activity, and decreased Al-dd growing media.

Pengaruh Pupuk Organik dan Arang Hayati terhadap Kualitas Media Pembibitan dan Pertumbuhan Bibit Kakao Kurnia Dewi Sasmita; Iswandi Anas; Syaiful Anwar; Sudirman Yahya; Gunawan Djajakirana
Jurnal Tanaman Industri dan Penyegar Vol 4, No 2 (2017): Jurnal Tanaman Industri dan Penyegar
Publisher : Pusat Penelitian dan Pengembangan Perkebunan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jtidp.v4n2.2017.p107-120

Pemanfaatan tanah masam Ultisol untuk media pembibitan kakao dihadapkan pada kendala rendahnya tingkat kesuburan. Oleh karena itu, perlu penambahan amelioran agar kualitas kimia, fisika, dan biologi tanah menjadi lebih baik. Tujuan penelitian adalah mengkaji pengaruh pupuk organik kulit buah kakao dan arang hayati terhadap sifat kimia dan biologi tanah media pembibitan dan dampaknya terhadap pertumbuhan bibit kakao. Penelitian dilaksanakan di Laboratorium Bioteknologi Tanah dan Laboratorium Kesuburan Tanah, Institut Pertanian Bogor dan Kebun Percobaan Pakuwon, Balai Penelitian Tanaman Industri dan Penyegar (Balittri), Sukabumi, mulai Juni 2014 sampai Februari 2015. Rancangan yang digunakan adalah acak lengkap (RAL) dengan susunan perlakuan faktorial tiga faktor yang diulang tiga kali. Faktor pertama adalah pemberian pupuk organik (tanpa pupuk organik dan dengan pupuk organik 10%). Faktor kedua adalah jenis arang hayati (sekam padi dan kayu sengon). Faktor ketiga adalah dosis arang hayati (0%, 1%, 2%, 4%, dan 6% dari bobot media pembibitan). Pengamatan dilakukan terhadap sifat kimia dan biologi media pembibitan, serta pertumbuhan bibit kakao. Hasil penelitian menunjukkan bahwa pemberian pupuk organik atau arang kayu sengon nyata meningkatkan C-organik dan nisbah C/N. Peningkatan dosis arang hayati atau pemberian pupuk organik dapat meningkatkan pH, N total, dan respirasi mikrob, sedangkan tanpa pupuk organik dapat meningkatkan populasi jamur, tetapi tidak dapat meningkatkan bobot kering bibit. Kombinasi arang hayati dan pupuk organik memperbesar diameter batang dan bobot kering tajuk bibit kakao.

The contribution of organic acid on heterotrophic CO2 flux from tropical peat: a trenching study Siti Nurzakiah; Atang Sutandi; Gunawan Djajakirana; Untung Sudadi; Supiandi Sabiham
Journal of Degraded and Mining Lands Management Vol 9, No 1 (2021)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2021.091.3035

Quantification of CO2 flux from peat has been studied with various methods of measurement and data analysis. Several studies have applied regression analysis to assess carbon flux from tropical peatland as a function of groundwater level. Such an analysis simplified the complex nature of peat decomposition, which involved microbial activities. The study was conducted at Buatan Village, Siak Indrapura Regency, Riau Province, Indonesia. Soil sampling was done every month for a year observation, from July 2018 to June 2019. This study aimed to comprehend CO2 production from the respiration of heterotrophic components (Rh-CO2) as a function of soil properties determined by soil pH, N-NH4, N-NO3, available P, exchangeable-K, C-organic acids, and environmental factors that are determined by soil water content, and groundwater level. The study applied trenching experimentation to quantify Rh-CO2 flux by first removing plant roots from the trenching plot. The CO2 flux and groundwater level were measured for five consecutive days each month for a one-year period. Multiple regression analysis was performed to determine the main determinant for the Rh-CO2 flux. The results showed that seasonal fluctuation of Rh-CO2 flux, negatively correlated with available P (p = 0.037), and positively (p = 0.018) with C-substrate as C-organic acids but not with either of the speciated ones as acetic, lactic, citric, malic, nor oxalic acids. More specifically, the C-organic acids were found as the main determinant factor (p = 0.039) affecting the Rh-CO2 flux.

Pengamatan Karakteristik Strain Cordyceps militaris (L) tipe liar alam dari lima perkebunan kelapa sawit di Muara Wahau Kalimantan Timur Edwin Aprianda; Gunawan Djajakirana; Darmawan Darmawan
Jurnal Penelitian Kelapa Sawit Vol 29 No 3 (2021): Jurnal Penelitian Kelapa Sawit
Publisher : Pusat Penelitian Kelapa Sawit

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/iopri.jur.jpks.v29i3.141

Cordycep militaris (L) is known in oil palm plantations as a natural enemy of nettle caterpillars. This fungus infects the caterpillars that descend down to become pupae around the palm circle, so that the pupae do not develop into imago and the pest's life cycle will be interrupted. This fungus is one of the 3 main entomopathogenic fungi used as bioinsecticides to control pests in oil palm plantations. In this study, the characteristics of C. militaris were observed from 5 oil palm plantations cultured in vitro using two types of media and two incubation methods. The results showed that there were mycelium pigmentation in nutrient-rich media Sabouraud Dextrose Agar plus Yeast extract (SDAY) when incubated with lighting. Only one of five mycelium cultures using SDAY media showed pigmentation on the no-light incubation method. Pigmentation did not occur in nutrient-poor media such as agar (WA), either incubated with lighting or with no-light. The growth of isolates was generally higher on SDAY media than on WA media. This study showed that C. militaris is a facultative phagotrophic fungus. The highest growth of isolates cultured on SDAY media incubated with lighting was found in isolates A and C, with colony diameter 90 mm, high mycelium density (+++) and hairy texture like cotton at the end of the 3rd week after inoculation. In the no-light incubation method, the highest growth was found in isolates B and C with colony diameter 90 mm, high mycelium density (+++) and hairy texture like cotton at the end of the 3rd week after inoculation. Isolates A and C showed high virulence potential to be used as bioinsecticides.

Co-Authors , Suprihati . DARMAWAN . Suwardi . Suwardi Amanda Kusuma Dewi Atang Sutandi Basuki Sumawinata Darmawan Darmawan Darmawan Darmawan Darmawan Dewi, Tirta Kumala Dhanti Hanifa Muslimah DWI ANDREAS SANTOSA Edwin Aprianda Eko Mapilata, Eko Erwinda Erwinda Gunawan Sutio Gusti Z. Anshari Iman Rusmana Indri Hapsari Fitriyani Indriyani, Yohanna Anisa Indriyati, Lilik Tri Iskandar ISKANDAR Iskandar Iskandar Iswandi Anas Iswandi Anas Komarsa Gandasasmita Kurnia Dewi Sasmita Laksono Trisnantoro Lili Handayani, Lili Munoz, Canecio Peralta Nourma Al Viandari Nur Izza Faiqotul Himmah Nuriman, Muhammad Nurul Faoziah Oktariani, Putri Putri Handayani Sijabat Qonita Qurrota A’yun RAHAYU WIDYASTUTI Riki Ruhimat Sarjiya Antonius Sarjiya Antonius Septiana, Liska Mutiara Simbolon, David Ricardo Siti Nurzakiah Siti Nurzakiah Sudirman Yahya Supiandi Sabiham Suryawijaya, Putu Kevin Syaiful Anwar Taufiq Hidayat Untung Sudadi Widrializa, . Yayuk Rahayuningsih Suhardjono Yohanna Anisa Indriyani

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