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All Journal Biocaster : Jurnal Kajian Biologi
Akhmad Akhmad
Program Studi Pendidikan Biologi, Fakultas Keguruan dan Ilmu Pendidikan, Universitas Mulawarman, Jalan Muara Pahu, Samarinda, Kalimantan Timur 75242, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Immunology & microbiology

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Pengaruh Ekstrak Daun Asian Ticktrefoil (Desmodium heterocarpon (L.) DC.) dan Bonggol Nanas (Ananas comosus (L.) Merr.) sebagai Pestisida Nabati terhadap Intensitas Serangan Serangga Hama pada Tanaman Sawi Hijau (Brassica juncea L.) Ainiyyah Nur Azizah; Sonja Verra Tinneke Lumowa; Dora Dayu Rahma Turista; Akhmad Akhmad
Biocaster : Jurnal Kajian Biologi Vol. 6 No. 3 (2026): July
Publisher : Lembaga Pendidikan, Penelitian, dan Pengabdian Kamandanu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/biocaster.v6i3.1328

Abstract

The study aimed to determine the effect of Asian Ticktrefoil leaf extract (Desmodium heterocarpon (L.) DC.) and Pineapple Weevil (Ananas comosus (L.) Merr.) as botanical pesticides on the intensity of insect pest attacks on Green Mustard (Brassica juncea L.) plants. This type of research is an experimental study conducted in the Agricultural Land of Jalan Jayakarta RT. 19, Rawa Makmur Village, Palaran District, Samarinda City. The research design used a Randomized Block Design (RBD) with 5 treatments, namely: T0 (control), T1 (detergent + water), T2 (50% Asian ticktrefoil leaf extract), T3 (50% pineapple weevil extract), and T4 (50% combination of Asian ticktrefoil leaf and pineapple weevil extract) with 5 replications. The data analysis results showed that the calculated F for each treatment, respectively, was (457.05) > F (4.77) at a significance level of 1%. This demonstrates a highly significant effect of the application of Asian Ticktrefoil (Desmodium heterocarpon (L.) DC.) leaf extract and Pineapple Weevil (Ananas comosus (L.) Merr.) as botanical pesticides on the intensity of insect pest attacks on mustard greens (Brassica juncea L.). These findings demonstrate the potential of locally sourced botanical pesticides as an environmentally friendly pest control alternative in mustard greens cultivation.
Analisis Kerapatan dan Ukuran Stomata Tumbuhan Dikotil pada Area Naungan dan Terbuka di Arboretum Sempaja (sebagai Bahan Ajar Materi Jaringan Tumbuhan Kelas XI SMA) Nuryani Nuryani; Herliani Herliani; Sri Purwati; Akhmad Akhmad
Biocaster : Jurnal Kajian Biologi Vol. 5 No. 4 (2025): October
Publisher : Lembaga Pendidikan, Penelitian, dan Pengabdian Kamandanu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/biocaster.v5i4.769

Abstract

Shading causes differences in light intensity that trigger physiological and morphological variations in leaves, including stomata density and size as a form of adaptation to balance photosynthesis and transpiration. This phenomenon is the basis for selecting the research, because it illustrates the adaptive ability of plants to changes in the microenvironment in their natural habitat. This study aims to analyze the density and size of stomata of dicotyledonous plants growing in shaded and open areas in the Sempaja Arboretum. This study uses a descriptive quantitative approach with samples of several dicotyledonous plant species growing in shaded and open areas. Data were obtained through microscopic observation of leaf epidermis preparations using direct section techniques, optilab, and image raster 3. Statistical analysis showed that the density of stomata in open areas was higher (480 stomata/mm²) than in shaded areas (323 stomata/mm²). However, the size of the stomata did not show a consistent pattern; The average length (25.21 µm) and width (18.45 µm) of stomata in the shaded area were slightly larger than those in the open area (24.16 µm and 17.18 µm). These results indicate that high light intensity encourages increased stomatal density as an adaptive mechanism to support photosynthesis.
Co-Authors Ainiyyah Nur Azizah Dora Dayu Rahma Turista Herliani Herliani Nuryani Nuryani Sonja Verra Tinneke Lumowa Sri Purwati