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All Journal Jurnal Biologi Tropis
Susanti, Hemalia
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology

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Long Periodism on the Speed of Nine O’clock Flowers (Portulaca grandiflora) Oktaviani, Intan; Agustina, Melinda; Susanti, Hemalia; Sundari, Muncar; Isnanto, Erliana Putri; Putri, Khalisah Nabila
Jurnal Biologi Tropis Vol. 25 No. 1 (2025): 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.v25i1.8344

Abstract

Long photoperiods can delay flower initiation and slow down the growth and formation of flower primordia, which can postpone flowering. This study aims to determine the photoperiodic response of the Nine O'clock flower (Portulaca grandiflora) to short light exposure. The research was conducted over one month (November-December 2024), with data collection specifically carried out on December 7, 2024, in Jombor Village, Bendosari District, Sukoharjo Regency, Central Java, from 05:08 AM to 10:00 AM. Observations were made on 19 plants to record blooming times, and data were analyzed descriptively and qualitatively. The results indicated that the blooming times of the Nine O'clock flower varied slightly among the observed plants, with an average blooming time of approximately 2 hours. In conclusion, while the Nine O'clock flower exhibits slight variations in blooming times, further research is recommended, particularly in locations with different altitudes. This study contributes to the understanding of the photoperiodic response of Portulaca grandiflora and its cultivation practices.  
Effect of AB Mix Concentration on Height and Leaf Number of Hydroponic Ipomea reptans Indriasari, Tyas; Susanti, Hemalia; Agustina, Melinda; Sabrina, Mutia Zakiyyatus; Suwarto, Suwarto
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.v26i1.11278

Abstract

Ipomoea reptans is a widely consumed leafy vegetable with high potential for hydroponic cultivation, which is greatly influenced by nutrient management. This study aims to determine the effect of various AB Mix solutions with different concentrations on plant growth and to identify the optimal concentration for plant development. The experiment was conducted in a greenhouse at Universitas Veteran Bangun Nusantara Sukoharjo using a completely randomized design (CRD) with three concentrations of AB Mix solution: high (5 ml/l), medium (3 ml/l), and low (1.5 ml/l), with five replicates for each treatment. Plant height and number of leaves were observed as growth parameters. Data were analyzed using one-way ANOVA at a 5% significance level, followed by Tukey's post hoc test. The results showed that various concentrations of AB Mix significantly affected plant height and number of leaves (P<0.05). The medium concentration (3 ml/l) showed the highest plant height and number of leaves compared to the other treatments. It can be concluded that a 3 ml/l AB Mix nutrient concentration is the most optimal for promoting the vegetative growth of Ipomoea reptans in hydroponic conditions and can be recommended as a practical guide for hydroponic cultivation to enhance plant vegetative growth.
Co-Authors Agustina, Melinda Indriasari, Tyas Isnanto, Erliana Putri Oktaviani, Intan Putri, Khalisah Nabila Sabrina, Mutia Zakiyyatus Sundari, Muncar Suwarto Suwarto