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Journal of Tropical Crop Science
Published by Institut Pertanian Bogor
ISSN : 23560169     EISSN : 23560177     DOI : -
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
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.
Arjuna Subject : -
Articles 24 Documents
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Search results for , issue "Vol. 12 No. 01 (2025): Journal of Tropical Crop Science" : 24 Documents clear
Genetic Variability of Echinochloa crus-galli Ecotypes from West Java, Indonesia, by RAPD Analysis Pasaribu, Pesta Maria Hotnauli; Rizqullah, Ramadaniarto; Ardie, Sintho Wahyuning; Guntoro, Dwi
Journal of Tropical Crop Science Vol. 12 No. 01 (2025): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jtcs.12.01.18-24

Abstract

Echinochloa crus-galli (Barnyardgrass: Poaceae), is one of the most detrimental weeds in rice fields globally. As one of the leading rice producers in Indonesia, controlling barnyard grass in rice fields in West Java province is of great importance. Information on the genetic variability of barnyard grass is necessary to determine proper weed control. A molecular marker is considered the most accurate tool in determining genetic variability as its profile is unaffected by the environment. The objective of this study was to evaluate the genetic variability of barnyard grass collected from seven sub-districts in West Java province, Indonesia, using RAPD markers. Genomic DNA of barnyard grass ecotypes from “Bayusari”, “Majalaya”, “Klari”, “Cugenang”, “Cianjur”, “Ciomas”, and “Ciampea” sub-districts were analyzed using eight RAPD primers and resulted in a total of 87 reproducible amplicons. Of these amplicons, 59 were polymorphic, and 28 were monomorphic, with a polymorphism percentage ranging from 37.5-92.8%. Polymorphism information content (PIC) values ranged from 0.21 to 0.41, indicating the used RAPD markers are highly informative. All seven ecotypes were divided into three distinct groups with a coefficient level of 0.77 in a dendrogram constructed following the UPGMA clustering method. Group 1 consisted only of the “Bayusari” ecotype. Group 2 consisted of “Majalaya”, “Klari”, and “Cugenang” ecotypes, while Group 3 consisted of “Cianjur”, “Ciomas”, and “Ciampea” ecotypes. This research indicated remote dispersal of E. crus-galli, since ecotypes from distant locations were found to be closely related
Knowledge, Attitudes, and Agricultural Practices of Coconut Farmers on the Impacts of Climate Change on Coconut Productivity and Sustainability in Barangay Capasnan, Manay, Davao Oriental, Philippines Bentayao, Chinna M.; Verzosa, Ricksterlie C.; Vilela, Eleanor M.; Nemenzo-Calica, Phoebe
Journal of Tropical Crop Science Vol. 12 No. 01 (2025): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jtcs.12.01.158-171

Abstract

Coconut, a vital tropical crop, and the Philippines’ leading agricultural export, particularly in Davao Oriental, the “Coconut Capital” of the country, is profoundly impacted by climate change, which disrupts its productivity and agricultural practices, thereby threatening its sustainability. This study evaluated the knowledge, attitudes, practices, perceived impacts, and preparedness of coconut farmers in Barangay Capasnan, a major contributor to Davao Oriental’s coconut production. A descriptive research design was employed, with 145 farmers (out of 227 registered) participating through purposive sampling. Data were collected through validated surveys, analyzed with descriptive statistics, and conducted under ethical guidelines. Results showed that most farmers (30%) were over 61 years old, with 59% male and 41% female participants. A majority (63%) had only elementary-level education, and most households (56%) comprised 1-4 members. Nearly all farmers (94%) owned their farms, but 59% had a monthly income below PHP 10,000 (~USD 170.24). Farmers demonstrated a high awareness of climate change, recognizing its effects on temperature, rainfall, seasonality, and its role in exacerbating extreme weather, pests, and diseases. They perceived climate change as a significant threat to agriculture, advocating for education and action, though engagement in community coping strategies remained moderate. Farmers implemented practices such as knowledge-sharing, exploring alternative income sources, investing in protective infrastructure, and planning for renewable energy use. However, moderate adoption was observed in water-saving irrigation, drought-resistant crops, soil conservation, and pest management practices. Climate change was perceived to have severe impacts on coconut yields, quality, soil fertility, seasonal patterns, and labor demands, while moderate impacts included extreme weather, water scarcity, and heat stress. Recommendations include providing emotional and mental support, financial assistance, access to resilient crop varieties, climate-smart agricultural training, affordable adaptive technology, and increased distribution of coconut seedlings by the Philippine Coconut Authority to address declining quality and productivity caused by weather changes.
Effect of Nitrogen on Intercropped Radish (Raphanus sativus L.) and Spinach (Spinacia oleracea L.) Productivity under Greenhouse Conditions Furqoni, Hafith; Mausbach, Jasmine; Fortner, Nathan; Chen, Xinzheng (Chris); Amori, Anthony Akpofure; Rystrom, Zachary
Journal of Tropical Crop Science Vol. 12 No. 01 (2025): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jtcs.12.01.116-123

Abstract

Due to a rapidly increasing global population and limited arable land, there is a need to increase crop productivity per unit area and optimize resource utilization by plants. One strategy to achieve improved resource utilization is intercropping, whereby two or more crops are grown in mixed or alternating patterns within a block of land. This study aimed to evaluate the effect of nitrogen on radish (Raphanus sativus L.) and spinach (Spinacia oleracea L.) intercropping on crop growth parameters and yield. Intercropped radish and spinach grown in the greenhouse resulted in only one radish-spinach intercrop ratio (50:50) with the same or greater productivity as radish and spinach monocultures, and it did not include an addition of nitrogen. The LER value associated with this treatment was 1.06. However, adding fertilizer resulted in significantly different (P<0.05) leaf numbers, chlorophyll content, and dry biomass of intercropped radish and spinach compared to treatments without fertilizer, except for leaf number in radish. Radish and spinach’s replacement series response curves are concave and convex, respectively, in fertilizer and non-fertilizer treatments. The response curves imply that radish is more aggressive than spinach in intercropping systems. In the only intercrop treatment with an LER>1.0 (50:50 without fertilizer), radish was 2.9 times more competitive than spinach.
How Do Groundwater Levels and Soil Moisture Influence the Peat Fire Vulnerability Index in Oil Palm Plantations? Purnamayani, Rima; Tarigan , Suria Darma; Sudradjat, Sudradjat; Syahbuddin, Haris; Dariah, Ai; Kartiwa, Budi
Journal of Tropical Crop Science Vol. 12 No. 01 (2025): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jtcs.12.01.235-245

Abstract

Peatland fires are a significant environmental issue, impacting local ecosystems and contributing to global climate change. This study evaluates the Peat Fire Vulnerability Index (PFVI) for sapric and hemic maturity levels under oil palm plantations in Pangkalan Pisang Village, Riau Province. Data on groundwater level, soil moisture, rainfall, and maximum temperature were collected from December 2021 to December 2022. The PFVI, modified from the Keetch-Byram Drought Index (KBDI), was calculated and correlated with these variables. The groundwater level varied from 3 cm to 76 cm below the surface, with an average of 36.23 cm. In sapric blocks, 29% of the groundwater level was less than 40 cm, while 73% were deeper. In hemic blocks, 44% were less than 40 cm, and 56% were deeper. Soil moisture in the top 10 cm layer fluctuated between 32% and 55% (v/v) Results showed significant negative correlations between PFVI and groundwater levels (r = -0.173 to -0.889) and soil moisture (r = -0.835 to -0.808), indicating that lower groundwater levels and soil moisture increase fire risk. High PFVI values in July corresponded with the lowest rainfall (59 mm) and groundwater levels below 40 cm. The study highlights the importance of monitoring hydrometeorological conditions and soil properties to effectively predict and mitigate peatland fires. Our findings are crucial for developing strategies to manage peatland sustainability and reduce fire hazards, especially in tropical regions with prevalent oil palm cultivation.

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