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All Journal JURNAL PERBENIHAN TANAMAN HUTAN Journal Corner of Education, Linguistics, and Literature
Nurmawati Siregar, Nurmawati
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Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Education Languange, Linguistic, Communication & Media Social Sciences Other

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PENGARUH NAUNGAN, ZAT PENGATUR TUMBUH , DAN TANAMAN INDUK TERHADAP PERAKARAN STEK JABON (Anthocephaus cadamba) Pramono, Agus Astho; Siregar, Nurmawati
Jurnal Perbenihan Tanaman Hutan Vol 3, No 2 (2015): Jurnal Perbenihan Tanaman Hutan
Publisher : Balai Penelitian Teknologi Perbenihan Tanaman Hutan

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Abstract

Teknologi pembiakan vegetatif perlu dikuasai dalam perbanyakan masal terhadap klon terseleksi yang akan meningkatkan kualitas dan kuantitas produksi hutan tanaman. Penelitian ini bertujuan untuk mengetahui pengaruh intensitas naungan, dosis IBA dan tanaman induk terhadap perakaran stek jabon. Intensitas naungan yang diuji adalah: tanpa naungan, naungan (25%), dan dosis IBA yang diuji adalah: 0 ppm, 750 ppm, 1500 ppm, dan 3000 ppm. Asal tanaman induk yaitu: bibit berasal dari biakan stek, dan bibit berasal dari biakan biji. Hasil penelitian menunjukkan bahwa penggunaan IBA dari konsentrasi 0 sampai 3000 ppm tidak berpengaruh secara nyata terhadap kualitas perakaran stek jabon. Faktor yang berpengaruh nyata terhadap perkaran stek adalah perlakuan naungan. Perlakuan naungan mampu meningkatkan kualitas perkaran stek jabon. Stek yang ditanam pada media dengan naungan 25% mampu meningkatkan keberhasilan hidup stek dari 57,5% menjadi 74,38% dan nilai panjang akar meningkat dari 9,75 cm menjadi 16,37 cm. Pucuk jabon dari bibit yang dibiakkan secara stek mampu meningkatkan keberhasilan stek dibandingkan dengan pucuk dari bibit biakan generatif.
The Effectiveness of Practice, Presentation-Demonstration, and Presentation-Discussion (PPDP) Learning Strategies Toward Students’ Conceptual Understanding Kadir, Dalimawaty; Nuzalifa, Yossie Ulfa; Siregar, Nurmawati; Rhamadona, Fitria
Journal Corner of Education, Linguistics, and Literature Vol. 5 No. 2 (2025): November
Publisher : CV. Tripe Konsultan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54012/jcell.v5i2.636

Abstract

Biology is one of the scientific fields that was born and developed through the steps of observation, problem formulation, making hypotheses based on experiments, drawing conclusions, and discovering concepts and theories. Biology learning will not be separated from laboratory or practical activities. Understanding the concept plays a very pivotal role in learning activities and has become the basis for achieving the learning outcomes. One of the instructional strategies is called PPD (Practice, Presentation and Discussion). This study aimed to determine the effect of the PPD strategies in enhancing students' conceptual understanding. This study applied a pre-experimental research method with One Group Pretest-Posttest Design. The subjects were twelfth grade high school students. These subjects were randomly selected with the number of 35 students. The results showed that the application of the PPD strategies has proven to be influential in enhancing students’ mastery of photosynthesis concepts. The increase in concept mastery could be viewed from the level change of students' comprehension as the mean score of 43.18, where the students’ initial knowledge (pretest) was 38.12, significantly increasing after the implementation of the PPD strategies (posttest) as of 81.30. Based on the standard of minimal accomplishment criteria, the effectiveness of the PPD strategies on students’ concept mastery was between 71-85 which was stated in the high category.
Co-Authors Agus Astho Pramono Kadir, Dalimawaty Nuzalifa, Yossie Ulfa Rhamadona, Fitria