Journal of Tropical Horticulture

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EISSN : 26228432
Total articles ≅ 26
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Editor Jthort
Journal of Tropical Horticulture, Volume 2; doi:10.33089/jthort.v2i2.31

Abstract:Cover, Journal Description, Editorial Team, Table of Content, Indexing
Editor Jthort
Journal of Tropical Horticulture, Volume 2; doi:10.33089/jthort.v2i2.32

Olivia Damayanti Putri, Dharmi Wimi Pertiwi, Bakti Wisnu Widjajani
Journal of Tropical Horticulture, Volume 2, pp 34-37; doi:10.33089/jthort.v2i2.19

Abstract:Pletekan (Ruelliatuberosa L.) is a flowering plant that grows wild. Pletekan has blue-purple flowers, containing the anthocyanin as its specific color. Anthocyanin is an organic material that can be used as an indicator of natural acid alkali, because the color of anthocyanin can ensure specific color changes when it reacts with materials at a certain pH as well. This research aimed to utilize anthocyanin extracted from pletekan as a determinant of soil pH. The used method was maceration extraction by soaking fresh pletekan flowers using maceration solvent (methanol acidified by HCl 1%) for 2-3 days. Concentrated anthocyanin extracts needed to be diluted with extracts that had not been concentrated so that the resulted color changes were more specific. The anthocyanin mixture was applied to pH 1-12 buffer solution and in acid and alkaline soil samples. The soil was dissolved using aquadest at a ratio of 1: 2, the soil was left to settle to get water. The color change in the tested water of soil sample was adjusted to the color of the buffer solution and pH meter. Results showed that color change of soil sediment-water which was dropped by natural pH indicators needed more indicator drops such as 2-3 levels than was color changes caused by the buffer solution.
Catur Hermanto, Rasiska Tarigan, Agustina E. Marpaung, Rina C. Hutabarat
Journal of Tropical Horticulture, Volume 2; doi:10.33089/jthort.v2i2.27

Abstract:The description of the agriculture success is inseparable from the level of knowledge of retailers and farmers on the effective use of pesticides in the field. This study aimed at evaluating the relationship between the level of knowledge of retailers and farmers on the distribution and use of pesticides in vegetable production centers in Karo Regency. The research was Berastagi Experimental Farm from August to September 2016. The research method used in the survey was a cross-sectional study approach. The selection of districts was done purposively based on the highest number of retailers, the largest horticultural planting area, and the number of vegetable farmers per district. The number of research samples was 10 respondents per district. To analyze the relationship between variables, we used Spearman's range correction coefficient calculation and validity test using SPSS correlation 17. The results exhibited that the level of knowledge of retailers and farmers in Karo regency is low about the functions, codes, and formulations of all pesticides that have been distributed. The level of knowledge of vegetable farmers on the use of pesticides in Karo district is low, seen from the high level of use, increasing concentration of pesticides and high frequency of spraying, as well as mixing fungicides and insecticides 2 types of pesticides with different codes and active ingredients. The relationship of farmers' knowledge with their age, education and the length of farming experience significantly influenced the perception and attitude of using pesticides to control pest attacks in their lands of cultivation.
Rizki Rizki, Nursyahra Nursyahra, Oki Fernando
Journal of Tropical Horticulture, Volume 2; doi:10.33089/jthort.v2i2.21

Abstract:Ethnobotanical study of weeds as traditional medicinal plants was conducted in West Pasaman, Indonesia. Weed is a type of wild plant that grows naturally without deliberately planted by humans. Weeds grow around housing residents or farmlands. Their existence is less desirable, but indigenous people in Luhak Nan Tigo, West Pasaman, utilize some types of weeds as traditional medicinal plants. This study was focused on identifying weeds as medicinal plants, disease treated, part of the weeds used, methods of preparation, and ingredients added. The descriptive survey method with observation and interview techniques was employed in this study. A total of 35 species of weeds belonging to the 23 plants family were identified. Weeds are used as traditional medicines to cure wounds, fever, bone pain, abdominal pain, back pain, itching, heartburn, asthma, and phlegm.
Rd. Selvy Handayani, Ismadi Yunus, M. Sayuti, Endri Irawan
Journal of Tropical Horticulture, Volume 2, pp 59-64; doi:10.33089/jthort.v2i2.23

Abstract:Durian (Durio zibethinus Murr.) is a tropical fruit grown in Southeast Asia and it has high nutritional and economic values and highly appreciated by consumers in Indonesia. Unfortunately, there are several obstacles in planting durian in Indonesia, specifically in Aceh. One of the abstacles is the scarcity of superior durian plants. Generally, plant conservations done conventionally through vegetative propagation. However, this technique has disadvantage such as harming the initial plants. Therefore, plant culture tissue has been used as a modern technique to develop durian plants. The objective of this research was to evaluate the effect of kinetin and 2,4 D on development of durian leaf explants through in-vitro bioassay. The research was conducted at Tissue Culture Laboratory, Faculty of Agriculture, Malikussaleh University from January to April 2019 using Completely Randomized Design (CRD) Factorial with 2 factors observed. The first factor was Kinetin (K): 0.0, 0.1 and 0.5 ppm. The second factor was auxin 2,4 D: 0.0, 0.5 and 1.0 ppm. The results showed that the in-vitro application of kinetin affected the induction of leaf callus. The application of 0.5 ppm of kinetin gave the best result compared to others. The in-vitro application of 2,4 D 0.5 ppm also possessed the best result compared to others. There was no interaction beween in-vitro application of kinetin and 2,4 D on the growth of durian leaf callus at all parameters observed.
Loekas Soesanto, Atsil Hiban, Woro Sri Suharti
Journal of Tropical Horticulture, Volume 2, pp 38-44; doi:10.33089/jthort.v2i2.20

Abstract:Application of Bio P60 and Bio T10 alone or in combination in suppressing stem rot of pakcoy and on pakcoy growth has been demonstrated. The research was carried out at the Plant Protection Laboratory and Screen House, Faculty of Agriculture, Jenderal Soedirman University. A split-plot design was used with application time (before and after inoculation of Sclerotium rolfsii) as main plot and Bio P60, Bio T10, and Bio P60 + Bio T10) as sub-plot. Observed variables were incubation period, disease intensity, crop height, number of leaves, and crop fresh weight. Results of the research showed that single and combined application of Bio T10 and Bio P60 did not differ in the suppression of stem-end rot in pakcoy. The combination of Bio T10 + Bio P60 was able to control the disease by delaying the incubation period and suppressing the disease intensity respectively by 37.48-39.16% and 54.77-6191% compared to controls. Combined Bio T10 + Bio P60 was able to improve plant height, number of leaves, and fresh weight of plants as 29.99-46.62, 24.39-35.07, and 71,17%, respectively, compared to controls. The results of this study suggest that the raw secondary metabolites of Bio P60 and Bio T10 either alone or in combination could be applied for the prevention or treatment of the diseases in pakcoy.
Meutia Zahara, Cho Cho Win
Journal of Tropical Horticulture, Volume 2, pp 65-69; doi:10.33089/jthort.v2i2.26

Abstract:Orchids are very famous for their beautiful and long-lasting flowers and variety among the most diverse family of flowering plants in the world, comprising thousand species and hybrids and very attractive. The research aimed to determine the morphological features of two local orchids Phalaenopsis amabilis L. and Dendrobium x Superbiens and the stomatal characteristics of both orchids. Plants were the only living organisms that are able to convert light energy/sunlight into chemical energy, and stomata is an important part of plants for CO­2 to enter the leaf and H­­2O to be released during the photosynthetic reactions. The results showed that Phalenopsis amabilis L. was monopodial orchid and Dendrobium x Superbiensis a sympodial orchid. A qualitative descriptive research method used to describe and interpreted the type of stomata of Phalaenopsis amabilis L and Dendrobium sp. stomatal density were counted on adaxial and abaxial part of the leaf, and the highest stomatal density was obtained on the abaxial part of Dendrobium x Superbiensleaf 290.81 mm­-2. The type of stomata was anomocytic for two local orchids.
Fitriana Nasution, Sri Hadiati
Journal of Tropical Horticulture, Volume 2, pp 50-53; doi:10.33089/jthort.v2i2.25

Abstract:Nine different accessions of water apples were evaluated at Indonesian Tropical Fruit Research Institute(ITFRI), Solok, West Sumatera from January 2013 to December 2014. This present study was aimed to evaluate the variability, heritability, genetic advance and its characters in nine different accessions to provide useful information in the improvement program of water apples. The research used Randomized Complete Block Design (RCBD) with two replications. The ANOVA results exposed significant differences at 5% probability level for all characters. Genotypic variance on fruit weight, fruit length, fruit diameter, leaf length were broad. However, the genotypic variance on total soluble solids, leaf width were narrow. The phenotypic variation for all characters was broad. The heritability estimation was categorized as low, moderate, and high. High heritability estimation was recorded for fruit weight, fruit length, fruit diameter, and leaf diameter. Moderate heritability estimation was noticed for total soluble solids. Leaf width had low heritability estimation. High heritability and high genetic advance were observed on fruit weight.
Odit Ferry Kurniadinata, Song Wenpei, Achmad Zaini, Rusdiansyah Rusdiansyah
Journal of Tropical Horticulture, Volume 2, pp 45-49; doi:10.33089/jthort.v2i2.24

Abstract:Kalimantan Island is rich in genetic resources and species diversity of Durio spp. Of the 27 durian species in the world, 18 species are found in Borneo. The large number of Durio species that grow in Kalimantan illustrates that this area is the most important distribution center for durian relatives. Two of the best-known edible durians in East Kalimantan are Durian (Duriozibethinus) and Lai (Durio kutejensis). However, as a plant with a cross-pollination mechanism, there are many results of natural crosses between the two. The study aimed to identify Durian x Lai plants in Loa Kulu, Kutai Kertanegara, East Kalimantan Province, Indonesia as the superior local fruit crops potentially agribusiness industry. This research was carried out by collecting data and information about the morphological characteristics of the plants and fruits from D. Zibenthinus x D. Kutejensis. The results of the study successfully identified 6 potentially superior plants that are believed to be the result of a cross between D. Zibenthinus x D. kutenjensis. The 6 potential superior plants were found to have different morphological characters. This is the initial identification and being a basis of the next research phase, which is to identify the morphology of trees, flowers, and fruit to obtain new cultivars crossing D.zibenthinus and D. Kutejensis which have superior potential as superior commodities from East Kalimantan.