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All Journal El-Hayah : Jurnal Biologi JURNAL AGROTEKNOLOGI
Oksana Oksana
Universitas Islam Negeri Sultan Syarif Kasim Riau
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Environmental Science Immunology & microbiology Medicine & Pharmacology

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PERBANDINGAN KONSENTRASI HARA DAUN KELAPA SAWIT (Elaeis guineensis Jacq.) USIA 6 DAN 8 TAHUN Oksana Oksana; Hermansah Hermansah; Agustian Agustian; Syafrimen Yasin
Jurnal Agroteknologi Vol. 16 No. 2 (2026): Februari 2026
Publisher : Universitas Islam Negeri Sultan Syarif Kasim Riau

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Oil palm productivity is closely linked to the nutrient status of its leaves, which serve as a reliable indicator of plant health and fertilizer requirements. Comparing leaf nutrient levels at different ages, such as 6 and 8 years, provides valuable insights into the dynamics of nutrient uptake and the optimization of fertilization strategies for sustainable yield. This study was conducted to assessing the macronutrient adequacy status of oil palm leaves based on diagnostic standards, and knowing the differences in these nutrients at ages 6 and 8 years. Leaf samples were taken from Kampar District, Riau Province by systematic random sampling of 14 oil palm trees to represent 20 ha of each age class. Leaf samples are leaves located on the 17th leaf sheath in the oil palm leaf phyllotaxis system. Analysis of plant nutrient levels using the X-ray fluorescence (XRF) series PAnalitycal Epsilon 3 method except for N-total with Kjeldhal (% dry weight). Results revealed that 6-year-old oil palms had optimal amounts of N, K, Ca, and Mg, along with elevated P and S. Conversely, 8-year-old palms showed deficiencies in N, K, Mg, and S, but optimal level of Ca and high P levels. T-test analysis (P value < 0.05) indicated significant differences in N, K, and S between the two age groups, while P, Ca, and Mg did not differ significantly.
Screening of Bacterial Isolates from Cow Manure with Potential as Antagonist Agents against Alternaria porri (Ellis) Cif. Sherin Rizkina; Syukria Ikhsan Zam; Mokhamad Irfan; Irwan Taslapratama; Yusmar Mahmud; Siti Zulaiha; Oksana Oksana; Nida Wafiqah Nabila M. Solin
El-Hayah:Jurnal Biologi Vol 10, No 5 (2026): EL-HAYAH (VOL 10, NO 5 September 2026)
Publisher : Program Study of Biology, Science and Technology Faculty, UIN Maulana Malik Ibrahim Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/elha.v10i5.45721

Abstract

Environmentally friendly control of Alternaria porri (Ellis) Cif. can be carried out using antagonistic agents such as bacteria. Exploration of bacterial sources as antagonistic agents needs to be continuously conducted, one of which is from cattle manure. This study aimed to obtain potential antagonistic bacteria against A. porri. Samples were collected using a purposive sampling technique. Bacterial isolation was performed using the spread plate method from dilutions of 10⁻⁶ to 10⁻⁸. Antagonistic activity was assessed using the dual culture method. This research obtained four isolates—PKa, PKb, PKc, and PKd—with cell counts ranging from 0.12 × 10⁹ to 1.83 × 10⁹ CFU g⁻¹. All isolates belonged to the Gram-positive group. Isolate PKa exhibited no catalase activity, whereas isolates PKb, PKc, and PKd showed catalase activity. PKa was identified as Clostridium, while PKb, PKc, and PKd were identified as Bacillus. All isolates demonstrated potential as antagonistic agents, with antagonistic activity ranging from 82% to 90%.
Co-Authors Agustian Agustian Hermansah Hermansah Irwan Taslapratama M Solin, Nida Wafiqah Nabila Mokhamad Irfan Sherin Rizkina Siti Zulaiha Syafrimen Yasin Syukria Ikhsan Zam YUSMAR MAHMUD