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Lalu Japa, Lalu
Program Studi Pendidikan Biologi Fakultas Keguruan dan Ilmu Pendidikan Universitas Mataran Jl. Majapahit No. 62 Mataram
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The Effect of Liquid Organic Fertilizer (LOF) from Rotten Fruit on the Growth of Chili Pepper Plants (Capsicum frutescens L.) Nafi'ah, Zidna Ilma; Sedijani, Prapti; Japa, Lalu
Jurnal Biologi Tropis Vol. 25 No. 4 (2025): Oktober-Desember
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v25i4.10408

Abstract

Fruit trash is a waste product that is typically dumped in the open without any additional handling, which can lead to illness, contamination of the air and water, and other issues. This study aims to analyze the effect and determine the right dose of using liquid organic fertilizer from rotten fruit on the growth of plant of cayenne pepper (Capsicum frutescens L.). This study was an experimental with a randomized design (CRD). There were 5 treatments, namely P0 (control/using 1000 mL water), P3 (300 mL LOF + 700 mL water or 30% concentration), P6 (600 mL LOF + 400 mL water or 60% concentration), P9: 900 mL LOF + 100 mL water or 90% concentration, and P12 (1200 mL liquid organic fertilizer or 100% concentration). Vegetative development (stem height, leaf area, and number of leaves) and generative growth (fruit fresh weight) were among the measurement criteria. The statistical test (ANOVA) was used to analyze the data at a significance level of 0.05. The outcome shown that the growth of cayenne pepper was considerably impacted by the usage of rotting fruit LOF. Following additional testing using the least significant difference test (LSD), the study's findings indicated that 60% (P6) of rotten fruit LOF was the ideal dosage for cayenne pepper's vegetative and generative growth, with an average plant stem height of 35.10 cm, leaf area of 53.90 cm2, number of leaves of 37 strands, and fresh fruit weight of 55.35 grams.
Water Quality Assessment of Bagek Kembar Mangrove Ecosystem Using Phytoplankton as A Bioindicators Setiawan, Yoszi; Japa, Lalu; Sedijani, Prapti
Jurnal Biologi Tropis Vol. 26 No. 1 (2026): Januari-Maret
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i1.11492

Abstract

Mangrove ecosystems are highly dependent on surrounding water quality, which can be effectively assessed using biological indicators such as phytoplankton communities. This study aimed to analyze the water quality of the Bagek Kembar Mangrove Essential Ecosystem, West Lombok, based on phytoplankton community. The research employed a descriptive exploratory design with purposive sampling at three mangrove ecosystem types: pond area, rehabilitated mangrove, and natural mangrove. Phytoplankton samples were collected using a plankton net and analyzed for abundance, species diversity, evenness, and dominance. Physical and chemical parameters including temperature, pH, and salinity were also  study fully identified 67 species of phytoplankton with a total abundance of 2,542.5 ind/L. Merismopedia elegans was a dominant species, particularly in the pond area. Diversity indices ranged from low to moderate, evenness valuew indicated relatively stable communities, and dominance indexs showed no species dominance. These results indicated that the waters of the Bagek Kembar mangrove ecosystem are generally in good condition with mild ecological pressure influenced by anthropogenic activities. This study provides baseline ecological data to support sustainable management and conservation strategies for mangrove essential ecosystems of Bagek kembar, West Lombok.
Community Structure of Gastropods in the Intertidal Zone of Tanjung Kelor Beach, Sekotong, West Lombok, Indonesia Febriyani, Lisa; Bachtiar, Imam; Japa, Lalu
Jurnal Biologi Tropis Vol. 26 No. 1 (2026): Januari-Maret
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i1.11679

Abstract

Tanjung Kelor Beach, located in Sekotong, West Lombok, is an intertidal area with high biological potential that supports coastal tourism development. However, information regarding the community structure of Gastropods in this area remains limited. This study aimed to analyze the abundance and species composition of Gastropods, family richness, and ecological indices: species diversity, evenness, and dominance indexs. Data were collected using the transect–quadrant method, with three transects placed perpendicular to the shoreline and a total of 30 quadrats measuring 1 × 1 m². The results revealed the presence of 17 Gastropod species belonging to 9 families, with a total of 1,209 individuals recorded. The community of Gastropod composition was dominated by the family Strombidae (43.09%) at the family level and Strombus urceus (15.72%) at the species level. Nerita undata (8.44%) wasa species consistently found at all stations across three substrate types: muddy, sandy, and seagrass beds. The diversity index (H’) was categorized as moderate (1.75–1.93), the evenness index (E) ranged from moderate to high (0.70–0.93), while the dominance index (C) indicated low values (0.17–0.20). These findings are expected to provide a scientific basis for coastal ecosystem conservation management and the development of educational tourism at Tanjung Kelor Beach.
Co-Authors A. Wahab Jufri Abdul Syukur Agil Al Idrus, Agil Al Ahmad Raksun Ahmad Raksun, Ahmad Arifin, Rizki Dewi Sativa Lestari Ario Kusuma, Dipo Astika, Leni Baiq Sri Handayani Budiawan Budiawan Dadi Setiadi Dianam DIDIK SANTOSO Didik Santoso Dining Aidil Candri, Dining Aidil Febriyani, Lisa Fidyantini, Findi Gito Hadiprayitno Gito Hadiprayitno Handayani, Sri Hariadi, Ismawan Hartiwi, Mei Hidayat, X Zardht Alex Hilman Ahyadi I WAYAN SUANA Ilhamdi, Mohammad Liwa Imam Bachtiar Jamiyyah, Shafro' Khuluq Karnan Karnan Khairuddin Kurniawan, Ramdani LALU ZULKIFLI Lestari, Tri Ayu Manisa, Safariyanti Mawaddah, Usratul Muazzasari, Fitra Muizzatissalmi, Hadyatul Munawaroh, Anggi Nurhardiyanti Nabila, Hesti Nadiyah, Nurfadhilah Nafi'ah, Zidna Ilma Nanisfi, Maulidatin Ni Luh Putu Pebri Artayani . Noviani, Echa Nur Hasanah Nurhidayati, Rosa PRAPTI SEDIJANI, PRAPTI Purnamawati, Rena Rahayu, Rachmawati Noviana Safarianti Manisa Sarnia, Saza Setiawan, Yoszi Shofiana, Dwi Auliya Sopiatuzza’rah Sopiyani, Nuzula Sukma, Izza Melati Suripto Suripto SUYANTRI, ENI Syafro’ Khuluq Jam’iyyah Syamsul Bahri Syazali, Muhammad Tri Wahyu Setyaningrum, Tri Wahyu Ulfaturrahmi, Martina Winata, I Gede Darma Yayuk Andayani Yusrianti, Rosita