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All Journal Jurnal Pijar MIPA
I wayan Merta
Biology Education Study Program, University of Mataram
Biochemistry, Genetics & Molecular Biology Chemistry Mathematics Physics

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The Effect of vermicompost and NPK fertilizer on tomato (Solanum lycopersicum) growth Ahmad Raksun; Mohammad Liwa Ilhamdi; I wayan Merta; I Gde Mertha
Jurnal Pijar Mipa Vol. 16 No. 5 (2021): November 2021
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (147.251 KB) | DOI: 10.29303/jpm.v16i5.2874

Abstract

Tomato is a plant of solanaceae family, has short stems, and grows well in tropical climates. Tomatoes have vegetative and generative growth phases. The availability of nutrients largely determines the vegetative growth phase. The purpose of the study is to determine: (1) the effect of vermicompost on tomato growth, (2) the effect of NPK fertilizer treatment on tomato growth, (3) the interaction effect of vermicompost and NPK fertilizer on tomato growth. The research was conducted using experimental methods. The research was carried out from April to July 2021. The research design was a 4 x 5 complete random factorial design with three repetitions. NPK fertilizer consisted of 4 levels of treatment doses, while vermicompost consisted of 5 levels of treatment doses. The research finding shows that the application of NPK fertilizer of 0.8 grams per plant significantly affected stem diameter, the number of compound leaves, leaf length, and stem height of tomatoes. Treatment of vermicompost of 1.8 kg of vermicompost resulted in the best stem diameter, number of compound leaves, leaf length, and stem height. The combination of vermicompost and NPK fertilizer had no significant effect on stem diameter, the number of compound leaves, leaf length, and stem height of tomatoes.
Effect of the Problem-Based Learning Model on Critical Thinking Skills and Biology Learning Outcomes Risma Yanti; Jamaluddin Jamaluddin; I Wayan Merta
Jurnal Pijar Mipa Vol. 21 No. 1 (2026)
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v21i1.11311

Abstract

Biology learning requires the development of critical thinking skills and learning outcomes through meaningful and contextual processes; however, classroom instruction is often still dominated by conventional approaches. This study aimed to analyze the effect of implementing the Problem-Based Learning (PBL) model on the critical thinking skills and Biology learning outcomes of Grade XI students at SMA Negeri 4 Praya. This research employed a quasi-experimental design with a pre-test–post-test control group. The participants were Grade XI students, divided into an experimental and a control class. The research instruments included a critical thinking skills test based on Ennis' (1996) indicators and a Biology learning outcomes test based on curriculum competencies. The results showed that students in the experimental class achieved significantly higher improvements in both critical thinking skills and learning outcomes compared to the control class. Statistical analysis indicated that implementing the Problem-Based Learning model had a positive, significant effect on student performance. These findings suggest that the PBL model promotes active and meaningful learning, making it an effective approach for enhancing critical thinking skills and Biology learning outcomes among Grade XI students.
Co-Authors Ahmad Raksun I Gde Mertha Jamaluddin Jamaluddin Mohammad Liwa Ilhamdi Risma Yanti