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All Journal BIOTROPIA - The Southeast Asian Journal of Tropical Biology KADIKMA Journal of Degraded and Mining Lands Management AGRIVITA, Journal of Agricultural Science PEDAGOGY Jurnal Pendidikan Islam Indonesian Jurnal Tanah dan Iklim Alifmatika: Jurnal Pendidikan dan Pembelajaran Matematika Jurnal Pendidikan LLDIKTI Wilayah I (JUDIK) Tematik: Jurnal Konten Pendidikan Matematika
Maswar Maswar
Indonesian Soil Research Instutute,The Agency of Agricultural Research and Development/AARD, The Ministry of Agriculture.
Religion Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Computer Science & IT Education Immunology & microbiology Languange, Linguistic, Communication & Media Mathematics Mechanical Engineering Physics Veterinary Other

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ENZYME ACTIVITY IN RELATION TO TOTAL K, Ca, Mg, Fe, Cu AND Zn IN THE OIL PALM RHIZOSPHERE OF RIAU’S PEATLANDS, INDONESIA Harianti, Mimien; Sutandi, Atang; Saraswati, Rasti; Maswar, Maswar; Sabiham, Supiandi
BIOTROPIA Vol. 25 No. 3 (2018): BIOTROPIA Vol. 25 No. 3 December 2018
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.2018.25.3.862

Abstract

Enzyme activity can be used as an indicator of peat decomposition in the oil palm rhizosphere of peatlands. Oil palm plantation management requires fertilization in the rhizosphere to provide nutrients for oil palm growth. The state of total nutrients in the rhizosphere can influence enzyme activity. This research aimed to study enzyme activity in relation to nutrient content in the oil palm rhizosphere of peatlands. Using the explorative method in Riau's tropical peatlands, an oil palm plantation was chosen as the main site, and a degraded forest as well as a shrubland were chosen as comparison sites. In the oil palm plantation, peat samples were taken from peat adhering to oil palm roots at depths of 0–25 and 25–50 cm and at distances of 0–1, 1–2, 2–3, and 3–4 m from the trees. In the degraded forest and shrubland, samples were taken from selected plant roots at depths of 0–25 and 25–50 cm. The triplicate peat samples were then composited for analysis of enzyme activity and total nutrient content. Results showed that enzyme activity (urease, phosphatase, β-glucosidase, and laccase) in the oil palm rhizosphere decreased as the distance from trees and the depth of the rhizosphere increased. The decline in enzyme activity was caused by low peat pH and increased water content as well as organic carbon content. Enzyme activity increased with increasing oil palm age and ash content. Total K and Zn contents showed no correlation with enzyme activities. However, total Ca and Mg contents showed a positive correlation only with β-glucosidase activity. Total Fe and Cu contents showed a significantly negative correlation with enzyme activities (urease, phosphatase, β-glucosidase, and laccase). Enzyme activity in the rhizosphere of the degraded forest and shrubland was mostly lower than in the oil palm rhizosphere.
The effectiveness of applying mathemagic as an alternative method of Joyful learning for junior high school students Qoyyimah, Annisaul; Maswar, Maswar
Alifmatika (Jurnal pendidikan dan pembelajaran Matematika) Vol 7 No 1 (2025): Alifmatika - June
Publisher : Fakultas Tarbiyah Universitas Ibrahimy

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35316/alifmatika.2025.v7i1.53-67

Abstract

This study aims to analyze the effectiveness of the mathemagic method as one of the alternatives to joyful learning methods for junior high school students. The objects of this study were students of State Junior High School 1 Situbondo, consisting of 30 students in the experimental class and 30 students in the control class. Data were collected through test instruments and questionnaires, then analyzed using descriptive and inferential statistics in the form of paired sample t-tests, and N-Gain tests. The results of the study showed that the application of the mathemagic method as an alternative joyful learning is effective in improving student learning outcomes on HOTS questions, with an average increase in scores from pre-test (68.80) to post-test (87.83) of 19.03 points in the experimental class compared to pre-test (63.23) to post-test (73.20) of 9.97 points in the control class, sig.t (p-value) 0.000 < 0.05. The N-Gain analysis was 61.71% (moderate category) in the experimental class, while the control class was 27.24% (low category). In addition, 85% of students gave a positive response to this method, especially in terms of motivation and interest in learning because it was considered interesting and enjoyable.
Co-Authors Agus, Fahmuddin Al Haddar, Gamar Anggraini, Fransisca Dyah Atang Sutandi Budi Mulyanto Dwi Putro Tejo Baskoro Harianti, Mimien Husnain, Husnain Iskandar Iskandar JUBAEDAH JUBAEDAH, JUBAEDAH M. Yogi Riyantama Isjoni Mujib Mujib, Mujib Neneng Laela Nurida Qoyyimah, Annisaul Rahmah Dewi Yustika, Rahmah Dewi Rasti Saraswati Solehuddin, Moh. Suprihartini, Yayuk Yoyo Soelaeman