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INDONESIA
BIOVALENTIA: Biological Research Journal
Published by Universitas Sriwijaya
ISSN : -     EISSN : 24771392     DOI : https://doi.org/10.24233/biov
Core Subject : Health, Science, Agriculture, Social,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Environmental Science Immunology & microbiology Medicine & Pharmacology
BIOVALENTIA: Biological Research Journal aims to review and publish the Biological research results from researchers. The range of articles which BIOVALENTIA: Biological Research Journal publishing is the research results in Biology science and applied Biology. Biology science is included Ecology, Biosystematics, Physiology, Developmental Biology, Microbiology, Genetics. Applied Biology is included Biotechnology, and the sciences derived from Biology science.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)
Articles 13 Documents
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Search results for , issue "Vol. 9 No. 2 (2023)" : 13 Documents clear
EVALUATION OF Bacillus thuringiensis-BASED BIOINSECTICIDE ON THE PRESENCE OF ARTHROPODS IN VEGETATIVE PHASE OF CARROT Novian Dwisatria; Yulia Pujiastuti; Chandra Irsan; Fitri Ramadhani
BIOVALENTIA: Biological Research Journal Vol. 9 No. 2 (2023)
Publisher : Biology Department, Faculty of Mathematics and Natural Sciences, Sriwijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24233/biov.9.2.2023.414

Abstract

Synthetic insecticides are still extensively used by farmers to control insect pests in carrots. The effects of excessive use of synthetic insecticides can damage agricultural ecosystems. This research aimed to examine Bacillus thuringiensis based bioinsecticide toward arthropods existence in vegetative growth phase of carrots The research was conducted in Pagar Alam City (700 m above sea level) and a relative humidity of 48–99%. The carrot plantations studied were planted in polyculture with mustard greens and sweet corn. This study used a completely randomized design (CRD) with 3 treatments and 9 replications. The treatments were bioinsecticide B. thuringiensis; synthetic insecticide (imidacloprid 200 g/l); and no-insecticide application (control). Agronomic observations were height of carrot and their number of leaves. Arthropods observations were carried out using sweep nets, pitfall traps, and direct visual observation. The results showed there was no significantly different on height of carrot plant and their number of leaves among three applications. Arthropods population in carrot plants treated with B. thuringiensis was lower than those in control carrot plants. In pitfall trap observations, the highest number of arthropod individuals obtained was belong to order Hymenoptera and had a moderate value of the Shannon-Wiener diversity index (H'). In addition, total insect population after application of B. thuringiensis observed using nets, tended to decrease from the second observation onwards. The category of insect diversity level trapped by Pitfall trap in B. thuringiensis bioinsecticide treatment was included in the medium category (H' = 1.75), while the treatment of imidacloprid (H' = 0.85) and control (H' = 0.81) was included in the low category.
SELECTION OF ANTAGONISTIC RHIZOBACTERIA POTENTIAL FOR BIOLOGICAL CONTROL OF Fusarium oxysporum Anggit Cahyani; Harman Hamidson; Suwandi Suwandi; Abu Umayah
BIOVALENTIA: Biological Research Journal Vol. 9 No. 2 (2023)
Publisher : Biology Department, Faculty of Mathematics and Natural Sciences, Sriwijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24233/biov.9.2.2023.416

Abstract

Fusarium oxysporum is a pathogen that causes wilt disease in many plants and can couse losses of up to fifty percent. Standard control is to use synthetic fungicides. However, continuous use of fungicides has a high environmental risk, so environmentally friendly and safe control efforts are needed. One way is by using rhizosphere bacteria or rhizobacteria. This research aims to obtain rhizobacteria isolates that can control the pathogen F. oxysporum, which causes fusarium wilt in vitro. This research was conducted from June to July 2023. The methods in this research included isolating rhizobacteria, observing the morphology of bacterial colonies, gram staining, gram reaction test, catalyst test, and in vitro antagonist test. Research data shows that of the thirty rhizobacteria isolates observed, all isolates had the potential to inhibit the growth of F. oxysporum. The KMTK2 showed the highest inhibitory ability isolate with an inhibitory ability of 73,99%, and the lowest inhibitory ability was shown by the TBA1 isolate with an inhibitory ability of 51,56%. Potential rhizobacteria isolates can suppress the growth of the pathogen F. oxysporum and can be used as a biological agent to reduce the use of pesticides in treating plant diseases.
GROWTH AND YIELD OF RUBBER TREE (Hevea brasiliensis) CLON PB260 FROM DIFFERENT OF WEED ECOSYSTEM Habibulloh; M. Umar Harun; Firdaus Sulaiman
BIOVALENTIA: Biological Research Journal Vol. 9 No. 2 (2023)
Publisher : Biology Department, Faculty of Mathematics and Natural Sciences, Sriwijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24233/biov.9.2.2023.421

Abstract

Community rubber tree plantations in Indonesia are the main source of national natural rubber production and a source of income for farmers. Low rubber price has limit farmers' ability to control weeds using herbicides and mechanically. This situation causes the formation of three ecosystem conditions based on the level of weed growth, namely well-maintained plantations, shrubs on rubber plantations, and forests on rubber plantations. Therefore, this research studied and compared tree growth and rubber yields from three of weed ecosystems. Field research was designed using a Randomized Block Design (RBD) with three ecosystems as treatments and three replications. Three plots of size (10 m x 10 m) were made for each weed ecosystem in the rubber plantation, and three sam-pling rubber trees were selected so that the number of rubber trees observed was 9 trees for each ecosystem. Based on ANOVA, it showed that the weed ecosystem had a significant effect on the yield of rubber trees. Trees maintained well had the highest lumps (537 kg/6monts/ha), not significantly different from forested rubber trees (478 kg/6monts/ha. The dominant weeds in each ecosystem were Hevea brasiliensis and Acacia auriculiformis. Forested plantations had higher yields relatively more stable, producing lumps per week of 107.55 g/tree to 188.15 g/tree.

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