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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 5 Documents
Search results for , issue " Vol 3 No 2 (2016): Journal of Tropical Crop Science" : 5 Documents clear
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.
Study on Medicinal Plants Used by the Ethnic Mamuju in West Sulawesi, Indonesia Syamsiah, Syamsiah; Hiola, Siti Fatmah; Mu’nisa, Andi; Jumadi, Oslan
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

Indonesia is known as a country with very high biodiversity, within which are potential medicinal plants that have not been fully explored or utilized. The potential of this natural biodiversity for the health and welfare of  the Indonesian  community  is regarded as high, if it is properly utilized. An example of the potential benefits of these plants is reflected in the types of traditional medicinal plants used by the Mamuju ethnic in West Sulawesi. This research aims to describe the types of plants used as traditional medicines by the Mamuju ethnic group. The study is based on descriptive approach that used a combination of observations, interviews and taxonomy.  The results of the study revealed that there are 31 species of medicinal plants used as sources of traditional medicine by the Mamuju ethnic group, of which there are 33 medical herbs used for the treatment of 31 kinds of diseases. The health issues that are addressed through the use of medicinal plants include the treatment of some types of internal diseases, including cysts, cancer, tumors, high blood pressure, ulcers and diabetes; disease symptoms such as itching, swelling, myopic, new injuries and infections. Some traditional medicines are used in relation to onset of menstruation, and postpartum treatment. The plant components that are used for medicinal purposes include roots, stems, stem bark, leaves, flowers, fruit, seeds, rhizomes and tubers. However, the predominant plant component used for medicinal purposes is plant leaves.
Water Balance in Oil Palm Plantation with Ridge Terrace and Nephrolepis biserrata as Cover Crop Ariyanti, Mira; Yahya, Sudirman; Murtilaksono, Kukuh; Suwarto, Suwarto; Siregar, Hasril H.
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

The existence of oil palm plantations as a possible cause of drought in the surrounding areas in Indonesia is a critical issue. Therefore, information related to the effects of oil palm plantations on the surrounding environment in terms of soil water content (SWC) availability is needed. Soil and water conservation techniques in the form  of ridge terracing and cover crops,  such as Nephrolepis biserrata,  can be  expected to potentially improve soil water  reserves, especially in the dry-season, by accumulating water  in the rainy season.  This study aimed to study the effects of N. biserrata as cover crop, together with the potential effects of ridge terraces, on the water balance in mature oil palm plantations.  The research was conducted in mature oil palm plantations, Afdeling III block 375 (planted in 1996) and block 415 (planted in 2005), Rejosari Unit, PT Perkebunan Nusantara (PTPN) VII in Natar District, South Lampung Regency, Indonesia, from August 2014 to January 2015. The research was based on of setting up 15 m x 20 m experimental plots with the following treatments:  (i) without ridge terraces and without N. biserrata (G0T0); (ii) without ridge terraces but with N. biserrata (G0T1); (iii) with ridge terraces but without N. biserrata (G1T0); (iv) with ridge terraces and with N. biserrata (G1T1).   Hydrology parameter data were collected for each treatment plot; water balance was calculated using a water balance equation. The results showed that the use of the cover crop N. biserrata in combination with ridge terraces helped improving SWC reserves by approximately 71% and 12%, respectively.  The use of N. biserrata as a cover crop reduced the rate of water loss by percolation and run-off, by approximately 36% and 80%, respectively, in an area where the annual rainfall is above 2,400 mm per year.  The presence of N. biserrata shortened the period of SWC deficit by extending the period of a water surplus by 70 days when compared with ridge terracing alone (which reduced the period of SWC by 50 days).
A Unique ‘Chain Tree’ Bauhinia (Caesalpinioideae, Leguminosae) from Pagerwunung Darupono Conservation Park, Central Java, Indonesia Lianah, Lianah
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

A tree species having a unique stem morphology has been found to grow at Sam Poo Kong temple, Gunung Batu, Semarang city, and at Pager Wunung  Darupono Conservation Park, Central Java, about 30 km away from the temple. Based on plant key reference identification the name of this tree species is Bauhinia scandens Willd, a liana from Leguminosae family. This species has a local name of ‘pohon rantai’ due to the chain shape of the stems. It flowered in August and the fruits matured in October. In vitro germination of the seeds collected from the Conservation Park was not successful and only one out of 30 seeds germinated in vivo after 12 weeks. Further studies should be conducted on conservation and propagation of this unique species.
Radiosensitivity Levels of In Vitro Cultured Celosia cristata Planlets by γ - Ray Irradiation Hayati, Dhieni; Aisyah, Syarifah Iis; -, Krisantini
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

Plantlets of the ornamental plant Celosia cristata were irradiated with gamma rays to increase their genetic diversity. This study was aimed to establish  the lethal levels of gamma radiation  (LD20, LD30 and LD50) for  C. cristata plantlets.   The irradiation doses used were 0, 25, 50 and 75 Gy. The growth of irradiated plantlets was evaluated to the third generation. Irradiated C. cristata MV1 plantlets showed a decrease in growth, with plantlets irradiated at 75 Gy showing only 30% survival.   Abnormal growth characteristics observed  in the  third generation plantlets included  the shortening of internodes, and curling of leaves.  LD50, LD30 and LD20 of C. cristata were 68.73 Gy, 46.68 Gy and 35.65 Gy, respectively.

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