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INDONESIA
Journal of Tropical Crop Science
ISSN : 23560169     EISSN : 23560177     DOI : -
Core Subject : Agriculture,
Journal of Tropical Crop Science is an international journal publishing research related to tropical crops. Articles in the journal focus on in-vivo and in-vitro production and production environment, breeding, seed technology, physiology, postharvest, pest and pathology of cereals, vegetables, fruits, ornamentals, medicinal and plantation crops; soil, landscape, turf and agro ecology management under tropical conditions.
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Articles 114 Documents
The Roles of Asystasia gangetica (L.) T. Anderson and Ridge Terrace in Reducing Soil Erosion and Nutrient Losses in Oil Palm Plantation in South Lampung, Indonesia Asbur, Yenni; Yahya, Sudirman; Murtilaksono, Kukuh; Sudradjat, Sudradjat; Sutarta, Edy Sigit Sutarta Sigit
Journal of Tropical Crop Science Vol 3 No 2 (2016): Journal of Tropical Crop Science
Publisher : Journal of Tropical Crop Science

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Abstract

Asystasia gangetica (L.) T. Anderson is a weed commonly found on oil palm plantations and can be used as cover crop for mature oil palm plantations due to its tolerance to shading. The use of cover crop is  a soil conservation technique to support sustainable availability of soil nutrients by reducing erosion and nutrients loss, particularly during the rainy seasons. This research aims to determine the roles of A. gangetica as cover crop for measures against erosion and nutrients loss in mature oil palm plantation. This research was conducted in oil palm plantation, Unit Rejosari, PT Perkebunan Nusantara (PTPN) VII, District of Natar, South Lampung Regency from August 2014 to April 2015. The research used split block design in randomized complete block design with two factors and six replications. The main plots were ridge terrace, namely with and without ridge terrace. The sub plots were cover crops, namely with and without cover crops A. gangetica. The results show that using A. gangetica as cover crops in mature oil palm plantations effectively minimized erosion and loss of organic C, N, P, and K by 95.7%, 93.4%, 96.0%, and 90.0 %, respectively. The use of cover crop became more effective when combined with ridge terrace and reduced erosion by 94.1% and loss of organic C, N, P and K by 99.1%, 99.2%, 90.0% and 98.5%, respectively.
Estimation of Genetic Parameter for Quantitative Characters of Pepper (Capsicum annuum L.) Syukur, Muhamad; Rosidah, Syaidatul
Journal of Tropical Crop Science Vol 1 No 1 (2014): Journal of Tropical Crop Science
Publisher : Journal of Tropical Crop Science

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Abstract

The research was conducted at Leuwikopo Experimental Field and Plant Breeding Laboratory of IPB, Dramaga, Bogor, West Java, Indonesia from October 2012 to April 2013. Crossing population between C15 and C2 genotype were used to study genetic parameters for quantitative characters in pepper. All the characters were not controlled by maternal effect, except fruit length. Broad-sense heritability were high for plant height, stem diameter, dichotomous height, days to flower, days to harvest; and medium for fruit length and diameter. Narrow-sense heritability was high for stem diameter, dichotomous height, days for flowering; medium for plant height, days to harvest; and low for fruit length and diameter. The ratio of additive variance was high for all the characters, except for fruit length and fruit diameter.Keywords: heritability, heterosis, heterobeltiosis, additive variance, dominant variance
Effect of Film Packaging on the Quality of Tomato Fruits under Ambient Conditions Edusei, Vida; Cornelius, Eric William
Journal of Tropical Crop Science Vol 2 No 3 (2015): Journal of Tropical Crop Science
Publisher : Journal of Tropical Crop Science

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Abstract

Polyethylene bags of different permeability were tested to extend the life of tomatoes (Lycopersicon esculentum) under ambient conditions. Tomato fruits at Breaker stage of ripening were packed in low density polyethylene bags (thickness 0.0046 mm) with four different types of perforation, i.e. without pinholes, bag with 10, 15 and 20 pinholes. All bags were stored for 21 days at 28ºC and 74% relative humidity. Fruits were evaluated for changes in colour, physical appearance, firmness and weight loss. Soluble solids content was determined at the end of storage. All unwrapped tomato fruits were red ripe 6 days after storage and after 21 days of storage fruits were soft, appeared deep red, shriveled and dusty. Fruits sealed in bags delayed red colour development, appeared glossy after 21 days of storage. Fruits sealed in polyethylene bags were significantly (p<0.05) firmer and had low weight loss than fruits stored unwrapped. Fruits sealed within polyethylene bag with 20 pinholes had the highest soluble solids content after 21 days. This study shows that storage of tomatoes in polyethylene bag under ambient condition is a promising alternative to refrigeration to reduce wastage and consequently increase the marketable life of harvested tomatoes in tropical countries.Keywords: tomatoes, storage, low density polyethylene bags, ambient conditions
In Vitro Adventitious Shoot Proliferation of Three Basil Species (Ocimum sp. L.) by Addition of Naphthalene Acetic Acid (NAA) and Benzyl Amino Purine (BAP) Wiendi, Ni Made Armini; Putri, Devina Daratyama
Journal of Tropical Crop Science Vol 4 No 3 (2017): Journal of Tropical Crop Science - available online January 2018
Publisher : Journal of Tropical Crop Science

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Abstract

Basils are mainly used as food flavoring and source of aromatic oil, but the leaves have also been used for herbals and cosmetics. Basil is propagated by seeds but the germination is often low in the field. This study aims to investigate the effect of different concentrations of NAA (Naphthalene Acetic Acid) and BAP (Benzyl Amino Purine) to induce the adventitious shoot proliferation of three species of basil (Ocimumsp. L.) in vitro. The research was conducted at the Tissue Culture Laboratory II of the Department of Agronomy and Horticulture, Bogor Agricultural University (IPB) from November 2016 till October 2017. This research consisted of three separate experiments with one basil species for each experiment, Lemon Basil, “Greek Minette”, and “Thai Siam Queen”. The experiments were organized in a completely randomized block design with two factors: NAA concentrations (0, 0.5, and 1 mg.L-1) and BAP (0, 1, 2, and 3 mg.L-1) using Murashige and Skoog (MS) medium supplied with 25 ml.L-1 coconut water. The three basil species responded differently to NAA and BAP in the media. The optimum concentration of NAA and BAP to induce callus growth in Lemon Basil was 0.5 mg.L-1 and 3 mg.L-1, respectively, with BAP alone showing the best effect on proliferation. In “Greek Minette”, however, the addition of NAA and BAP had no significant effect on the callus growth, proliferation, height, and number of leaf, node and root per explant. Media without growth regulators provide the best results in increasing height, explant proliferation rate, number of nodes and shoots, and percentage of proliferating shoots of “Thai Siam Queen”.Keywords: cytokinin, “Greek Minette”, Lemon Basil, “Thai Siam Queen”, synthetic auxin
The Potentials of Limau (Citrus amblycarpa Hassk. Ochse) as A Functional Food and Ornamental Mini Tree Based on Metabolomic and Morphological Approaches Budiarto, Rahmat; Poerwanto, Roedhy; Santosa, Edi; Efendi, Darda
Journal of Tropical Crop Science Vol 4 No 2 (2017): Journal of Tropical Crop Science
Publisher : Journal of Tropical Crop Science

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Abstract

Limau (Citrus amblycarpa (Hassk.) Ochse) is one of the native Citrus species of West Java that is grown in the local backyard, thus is easily found in local cuisines. Limau has great potentials for use as a potted plant in home gardens for its aesthetic value and fragrance. The objective of this research was to describe the metabolites fingerprint and morphology of Limau as a potential functional and ornamental mini tree. Methanol leaf extracts from one-year-old Limau originated from Bogor were analyzed using untargeted Gas Chromatography Mass Spectrometry (GCMS). Methanol leaf extract was dominated by vitamin E and composed of other 18 metabolites including phytosterols, fatty acids and terpenes. The major portion of fruit extract consisted of 6-octadecenoic acid, palmitate and various fragrance compounds such as alpha sinensal, alpha limonene, beta citronellal, citronellol, and sabinene. Limau fruits are also a functional food due to its rich antioxidant and aromatic content in the fruits. The morphology of limau tree is suitable as a potted ornamentals or mini-fruits tree for its small crown, sparse branching with unifoliate aromatic leaves and small spines, and plentiful aromatics mini fruits with the diameter of around 2-4 cm.  
Improving Performance of Coleus through Mutation Induction by Gamma Ray Irradiation Aisyah, Syarifah Iis; Marthin, Yodi; Damanik, M. Rizal M.
Journal of Tropical Crop Science Vol 2 No 1 (2015): Journal of Tropical Crop Science
Publisher : Journal of Tropical Crop Science

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Abstract

The objective of this study is to study the effect of gamma ray irradiation (15, 30, 45, and 60 gray (Gy) to determine Lethal Dose 50 (LD50) values, and to obtain new Coleus variances in a relatively short time. The study was conducted in a greenhouse at Cikabayan experimental field, Bogor Agricultural University, Darmaga, Bogor in May to July 2013. Gamma irradiation treatment significantly affected height, number of leaves, and number of nodes. Increasing the dose level of gamma irradiation tend to inhibit plant growth. LD50 for yellow/green, green/brown, variegated green/brown of Coleus blumei, and Coleus amboinicus Lour were 48.66, 65.2, 52.81, and 37.62 Gy respectively. C. amboinicus  irradiated at a dose level of 45 Gy had different leaf shapes compared to control. Keywords:  Coleus, gamma ray irradiation, LD50 values, ornamental plant, torbangun
Characterization of 13 Accessions of Purslane (Portulaca sp.) from Bogor, West Java, Indonesia Setiawan, Farensa Ikman Dedi; Aisyah, Syarifah Iis; Krisantini, Krisantini
Journal of Tropical Crop Science Vol 3 No 3 (2016): Journal of Tropical Crop Science
Publisher : Journal of Tropical Crop Science

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Abstract

Characterization is part of crop the breeding process aims to protect biodiversity and preserve local germplasm. Indonesia has two known species of Portulaca, Portulaca oleracea and P. grandiflora. Thirteen Portulaca accessions have been collected from Bogor area, comprising five accessions of Portulaca oleracea and eight accessions of Portulaca grandiflora. This study was aimed at the characterization of the 13 accessions and was undertaken at Indoflower BLST, Bogor, between October 2015 to February 2016. The results showed a significant difference in the color of flowers between the two species of Portulaca. The most significant difference is the overall appearance of P. oleracea species. Character color and shape of the flowers between the P. grandiflora white (GW) and P. oleracea are similar.  Significant differences between the species exist in relation to the root systems, but the root systems of accessions within each species are generally similar.  The branching characteristics between the two species and among accessions are generally similar, with branches emerging through the base of leaves or nodes.   However, there are differences in the leaf characteristics between the two species. This study has provided information on flower characteristics of P. grandiflora and P. oleraceae which will be valuable for future breeding efforts in Portulaca. 
Description and Ecology of Indonesian Species Tetrastigma glabratum (Blume) Planch, a host of Rafflesiaceae Lianah, Lianah
Journal of Tropical Crop Science Vol 1 No 2 (2014): Journal of Tropical Crop Science
Publisher : Journal of Tropical Crop Science

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Abstract

This article presents an overview of the currentknowledge of Tetrastigma glabratum (Blume) Planch, ahost of Rafesiaceae, by providing information onbotany and ecology of T. glabratum, and conservationstatus by propagating the plants vegetatively andmonitoring its growth in-situ and ex-situ. The study wasconducted in the protected rainforests at Mount Prau,Candiroto, North Kedu, Central Java between 2009-2014. Shoot growth and expansion in stem diameterwere faster in-situ than ex-situ whereas the number ofleaves was similar in both locations. Ex-situconservation and cultivation is very important to protectthese rare, unique, and endangered species fromextinction.
Increasing Production of Chilli (Capsicum annuum L.) through Foliar Fertilizer Application Sugiyanta, Sugiyanta; Kartika, Juang Gema
Journal of Tropical Crop Science Vol 5 No 1 (2018): Journal of Tropical Crop Science - available online July 2018
Publisher : Journal of Tropical Crop Science

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Abstract

Chili is one of the most important spices in Indonesia; the demand for chili is increasing along with the growth of the population. Chilli is generally grown under intensive culture which includes addition of fertilizers to improve crop growth and increase crop productivity.  A study was conducted to examine seven different rates of an inorganic foliar fertilizer HF at 0.5, 0.75, 1, 1.25 and 1.5 of the recommended rate, with no foliar fertilizer and a standard foliar fertilizer GD as control. The results showed that spraying foliar fertilizer HF generally improved the growth and yield of chilli compared to without fertilizer. Plant height, number of branches and number of fruits per plant, weight per fruit, weight per 10 fruits, yield per plant, yield per plot, and yield per ha of chilli treated with inorganic fertilizers was significantly higher than the without foliar fertilizer. Foliar fertilizer HF at 0.5 of the recommendation rate, or 1 kg.ha-1 foliar fertilizer applied at 4, 6, 8, 10, and 12 week after planting in addition to the basic fertilizers of 400 kg.ha-1 of urea, 200 kg.ha-1 of SP-36, 250 kg.ha-1 of KCl applied to the soil, was effective to obtain the maximum chilli fruit yield.
The Use of Bokashi to Enhance Agricultural Productivity of Marginal Soils in Southeast Sulawesi, Indonesia. Karimuna, La; Rahni, Nini Mila; Boer, Dirvamena
Journal of Tropical Crop Science Vol 3 No 1 (2016): Journal of Tropical Crop Science
Publisher : Journal of Tropical Crop Science

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Abstract

The yield of agriculture crops tends to be decreasing in many parts of world including in Indonesian farmers’ land.  One of the causes of the decreased yields is the reduction of organic matter in the soil. Peanut is one of the important crops in southeast Sulawesi and is usually intercropped with maize. However, the yield of peanut and maize crops were low as they were grown in marginal lands that have low nutrient contents, low CEC, high acidity, and low organic matter. The objectives of this paper were to summarize the results of our studies on the use of bio fertilizer bokashi plus fertilizer to improve peanut yields grown in marginal soil in southeast Sulawesi, Indonesia. The study also examined the agronomical performance of several local peanut varieties which had high adaptability to the local conditions and marginal lands. The results of this study demonstrated that application of mulch and bokashi increased maize and peanut production, seed dry weight and 100-seed weight. This practice has potentials to be applied in other agricultural lands of southeast Sulawesi region with similar soil and climatic condition to increase peanut yield, and promote the sustainable agriculture production of the region.

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