Oslan Jumadi

Universitas Negeri Makassar | UNM · Department of Biology

In the agricultural trade, nitrogen fertilizer is one among the popular fertilizers within the world market. However, the high use of nitrogen fertilizers causes negative impacts within the type of environmental pollution, each in water, soil, and within the air. Nitrification inhibitor required to enhance the potency of nitrogen fertilizer use to...

Penelitian ini bertujuan untuk mengetahui pengaruh variasi formulasi pakan Black soldier fly (BSF) Hermetia illucens yang terdiri dari limbah ikan dan sayuran terhadap kandungan nutrisi larva BSF. Jenis penelitian ini adalah eksperimen dengan menggunakan 4.000 larva BSF yang telah memasuki fase instar dua. Pemeliharaan larva BSF dilakukan selama 15...

Background Diagnosis and management of latent tuberculosis (TB) infections are one of the challenges of eradicating pulmonary TB. A critical aspect of controlling pulmonary TB spread is early diagnosis. One TB biological marker type under evaluation is microRNAs (miRNAs). Mycobacterium tuberculosis infection causes epigenetic changes. The upregulat...

Slaughterhouses (RPH) produce large amounts of solid waste every day and have not been utilized optimally. RPH solid waste has great potential to be used as plant fertilizer through the composting process. Composting is expected to change the organic material composition of the abattoir solid waste to be more ideal to support plant growth. This stu...

The number and type of microorganisms in the soil indicate soil fertility. The use of fertilizers can affect the growth of microorganisms in the soil. Quantitative tests are conducted to evaluate how fertilizers affect the presence of bacteria, fungi, and algae. The number of bacteria and fungi is calculated using the standard plate count method, w...

Organic fertilizers contain complete nutrients needed by plants, such as humic acid and fulvic acid, that can promote plant growth and increase the population of beneficial microbes in the soil. Algae can be an organic fertilizer in extract preparations that can increase plant growth and improve soil composition. The calculated number of microbes f...

Tuber rot disease due to phytopathogen Fusarium oxysporum f. sp. cepae (Foc) infection is one of the main factors causing the decreasing global onions production. This study aims to find bacteria and fungi candidates with Foc antagonistic activity through in vitro tests using dual culture techniques. A total of three bacterial isolates and three fu...

In the past half-century, the production of crops and livestock is strongly driven by the increased use of irrigation, agriculture machinery, fertilizer, and pesticide. A balanced amount of fertilizer is needed to increase food production and to meet food security requirements by allowing a stable amount of staple food production. However, the amou...

The aim of this study was to isolate and characterize the Phosphate solubilizing bacteria from the rhizosphere of Zea mays L., Jeneponto Regency. This research was conducted in several stages; i.e, sampling, medium preparation, sample dilution, isolation, characterization in the form of gram staining, biochemical tests, and quantitative tests of ph...

The research aims is to determine the suitability of nitrogen fixing bacteria, namely Actinomycetes, Azospirillum and Azotobacter with upland rice seeds to the speed of radicle formation and growth of upland rice plants. Upland rice plant growth measurement parameters include; speed of formation of radicle length, upland rice plant height, number o...

The study aimed to find alternative substrates for growing spawn of oyster mushroom (Pleurotus ostreatus). The experiment was laid out in a completely randomized design with three compositions of substrates. The substrate compositions were: (1) Substrate A (corn 100%), (2) Substrate B (corn and sawdust mix in a ratio of (1:1, v/v)), and (3) Substra...

s Brown Algae Extract is one of the ingredients used in organic fertilizers that is more effective for maximizing the growth and production of corn plants. This study aims to determine the effect of fermented brown algae extract on the growth of corn. The research was conducted in Sokkolia Field, Gowa District. The treatments were arranged in a ran...

The evaluation of endophytic actinomycetes diversity, growth-promoting strain effects on cauliflower seeds germination, and in vitro organogenesis are the objectives in this study. Moreover, 15 strains from 125 isolates were determined to produce indole-3- acetic acid (IAA), where majority was obtained from roots (66.67%), followed by from branches...

Tuber rot disease due to phytopathogen Fusarium oxysporum f. sp. cepae ( Foc ) infection is one of the main factors causing the decreasing amount of global shallot production. This study aims to find bacteria and fungi candidates which have Foc antagonistic activity through in vitro tests using dual culture techniques. A total of five bacterial iso...

This study aims to determine the type of isolates and the characteristics of nitrogen-fixing bacteria in the rhizosphere of corn (Zea mays L.) from Jeneponto regency, South Sulawesi. This research is an explorative study consisting of nitrogen-fixing bacteria isolation and identification using nitrogen free bromohymol blue (Nfb) medium, and an ammo...

This study aims to determine the effect of the application of algae Sargassum sp. extract on the growth of corn plants ( Zea mays L.) and the response of soil microbes through the use of the Randomized Group Design (RGD) consisting of 3 repeats. The algae Sargassum sp. extract had 3 concentrations namely algae 30%, algae 60% and algae 90%. Then the...

This research aims to determine the growth response of corn plants (Zea mays) given zeolite coated urea fertilizer as a nitrogen slow-release fertilizer. This research uses Randomized Group Design (RGD) with 3 repeats. The observation parameters are. Corn plant growth including corn cob weight (grams), corn cob length (cm) and corn kernel weight (g...

Typhoid fever is a infectious disease caused by Salmonella typhi (S.typhi), and is one of the leading causes of mortality and morbidity of deaths worldwide. New antibacterial sources can be obtained from bioactive compounds contained in a plant, one of which is from the seagrass Thalassia hemprichii contains bioactive compounds that have the potent...

Field and incubation experiments were conducted to determine the emission rate of greenhouse gases, nitrogen change, populations of AOB, NOB, and fungi as well as growth of corn in response to amendment of urea granulated with and without nitrification inhibitors and zeolite. The application of urea with neem, urea with zeolite, urea with zeolite +...

This research study aims to determine the production of nitrous oxide (N 2 O), carbon dioxide (CO 2 ), the rate of ammonium-nitrate, microbe responses in soil following the addition of urea coated by zeolite under soil incubated. The result showed that urea granulated with zeolite in soil sample had a significant effect on the production of CO 2 an...

This research was carried out to study the growth of maize fertilized with a composite of urea with slow release materials (polyacrylate polymer and zeolite) and nitrification inhibitors, Mimba ( Azadirachta indica ). Three times repetitions of Randomized Block design was used in this study. The parameters observed included biomass (g), the weight...

Plant Belajang Susu ( Scindapsus pictus Hassk.) is a species of the genus Scindapsus including Araceae family that has long been used by Mambi traditional communities as anticancer. Plant that include genus Scindapsus are generally used as ornamental plants, and there are also used as medicinal plants because they contain active compounds and can b...

This research was aimed to know the growth of corn plants (Zea mays) given composite urea fertilizer with slow release material (polyacrylic polymer and zeolite) and nitrification inhibitor (mimba). This study used Randomized Block Design (RAK) with 3 repetitions. The parameters studied were growth of corn plant comprise stem circumference (cm), le...

A field experiment was carried out to determine the emissions of nitrous oxide (N2O) and methane (CH4) and yield of rice grains under water management of continuously flooded (CF) and non-continuously flooded (NCF) systems and to find out those were affected by both input of water managements in combination with urea granulated with nitrification i...

This study is an experimental research that aims to find out how the response of corn growth (Zea mays) with urea-coated zeolite as nitrogen release slowly, implemented from April to December 2017. The making of fertilizer is done in Biology Laboratory of East III Floor Department of Biology Faculty of Mathematics and Natural Sciences of Makassar S...

The students’ learning results in Biology are influenced by two factors, namely internal and external factors. The internal factors that can influence learning results are learning style, learning independence, and learning interest. The research aims to discover the relation of learning style, learning independence and learning interest with Biolo...

The aim of this research is to investigate the ability of nitrogen fixing bacteria isolates obtained from crop rhizosphere in the District of Maros, South Sulawesi province, Indonesia to excrete ammonium, to produce growth promoting substance called Indol Acetic Acid (IAA), to solubilize phosphate and their effect on plant growth. There were 43 pre...

Indonesia is known as a country with very high biodiversity, within which are potential medicinal plants that have not been fully explored or utilized. The potential of this natural biodiversity for the health and welfare of the Indonesian community is regarded as high, if it is properly utilized. An example of the potential benefits of these plant...

ABSTRAK Bahan penghambat nitrifikasi seperti Mimba (Azadirachta indica) dan DCD (Dicyandiamide) mampu menekan laju nitrifikasi. Kombinasi bahan penghambat nitrogen dan pupuk urea diharapkan dapat menekan pengubahan gugus amonia menjadi nitrit dan nitrat yang dapat mengurangi efisiensi aplikasi pupuk nitrogen. Penelitian dilakukan untuk mengetahui r...

Azolla microphylla Kaulf. (Azolla) biomass was composted to create a high nitrogen (N) organic matter amendment (Azolla compost). We examined the effect of this Azolla compost on carbon (C) and N mineralization and the production of biogenic gases, nitrous oxide (N2O) and carbon dioxide (CO2), in a soil incubation experiment. A pot experiment with...

Urea coated with neem fertilizer is one of the solutions to increase the efficiency of nitrogen fertilizer and reduce greenhouse gases emission. Inhibition of the nitrification rate of urea can reduce NO2- and N2O gas, and at the same time urea can be efficiently absorbed by the plants. Neem (Azadirachta indica) can suppress nitrification rate of 2...

Several options to reduce methane (CH4) emission from rice fields have been reported including straw management, soil amended with Fe(OH)3 and iron slag, encapsulated calcium carbide, and water management by drainage-flooding. In the present paper, field experiments were conducted to determine whether controlled water level below 3 cm and 6 cm migh...

The potential of methane and nitrous oxide productions and community structure of methanogenic archaeahas been characterized by incubation studies and PCR-DGGE approaches, respectively. The results showed thataddition of straw into the soil was the most important factor that influenced CH4 production in this incubation 4 experiment, while N2O produ...

The potentials of nitrous oxide (N2O) and carbon dioxide (CO2) production in acid tea soils from Indonesia and Japan were investigated in a laboratory incubation experiment, and the community structures of ammonia-oxidizing bacteria in these soils were characterized using PCR-DGGE approaches. The soils used were sampled from tea plantations in Shiz...

Field experiments were designed to quantify N2O emissions from corn fields after the application of different types of nitrogen fertilizers. Plots were established in South Kalimantan, Indonesia, and given either urea (200 kg ha−1), urea (170 kg ha−1) + dicyandiamide ([DCD] 20 kg ha−1) or controlled-release fertilizer LP-30 (214 kg ha−1) prior to t...

The influences of chemical fertilizers and a nitrification inhibitor on greenhouse gas fluxes (N(2)O and CH(4)) in a corn field in Indonesia were investigated using a closed chamber. Plots received 45+45 kg-N ha(-1) of nitrogen fertilizer by split applications of urea, a single application of controlled-release fertilizer (CRF-LP30) or urea+dicyand...

Incubation and field experiments were conducted to determine emission and production of nitrous oxide (N2O) and responsible microorganisms in an upland acid soil of Indonesia. The results showed that N2O productions in the soil samples were affected by ammonium and urea amendments compared with control. N2O production reached the highest peak at th...

When Acremonium sp. IMI 383068 was grown under chemostat conditions with scleroglucan as sole carbon source, the fungus produced four (1 → 3)-β-glucanases and a single (1 → 6)-β-glucanase. Production of the (1 → 3)-β-glucanase was growth rate related while the (1 → 6)-β-glucanase was growth rate unrelated. Specific activities of both were affected...