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Journal of Agronomy
eISSN: 1812-5417
pISSN: 1812-5379

Editor-in-Chief:  Francisco Fabian Fuentes Carmona
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Research Article
Effect of Harvest Time on Bioactive Compounds of Field-cultivated Centella asiatica (L) Urban
Noverita Sprinse Vinolina, Luthfi Siregar, Bilter Sirat, Nurhayati , Enny Adelina and Laila Nazirah
Background and Objectives: Pegagan, Centella asiatica (L) Urban is an important traditional herb and its wild population is currently heavily exploited due to commercial cultivation shortage. This study evaluated the content of different bioactive compounds in the leaves and roots of Pegagan, Centella asiatica (L) Urban cultivated in field condition and harvested at different times. Materials and Methods: The contents of centellosides in the leaves and roots of field-cultivated Deli Serdang Pegagan Accession were determined by using ultra fast liquid chromatography system. The levels of bioactive compounds in relation to harvest time were compared with an additional discussion on the dry/wet weight relationship. Results: The result showed that asiaticoside and madecassoside increased while asiatic acid decreased over time in both the leaves and roots of Pegagan. However, the leaves were shown to have significantly higher amounts of all centellosides compared to the roots in all harvest time treatments. Conclusion: This study concluded that a late harvest of Pegagan is best to maximize the production of asiaticoside and madecassoside. Conversely, early harvest was best to the maximum amount of asiatic acid in Pegagan.
Research Article
Productive Urban Landscape through Urban Trees on Roadside Greenery of Yogyakarta City
Siti Nurul Rofiqo Irwan, Retno Nur Utami, Ahmad Sarwadi and Alia Bihrajihant Raya
Background and Objective: Previous studies explained specifically about urban plant diversity and productive urban landscape. This study evaluated urban trees through the implementation of productive urban landscape concept in the tropical city of Yogyakarta. Materials and Methods: Field observation and investigation were conducted by survey method. Data collection was conducted at 27 locations of roadside greenery, i.e., 2 secondary arterial roads (SAR), 3 secondary collector roads (SCR) and 22 local streets (LS). Data were analyzed through tree diversity and evenness calculated by Shannon-Wiener (H) and Evenness (E) Indices. Urban trees were classified by tree size and productive values. Spatial distribution of trees was interpreted by detrended correspondence analysis (DCA). Results: The roadside greenery was identified by 1884 trees belong to 62 species. The tropical Mimusops elengi is overwhelmingly dominant (38,15%) followed by Polyalthia longifolia (10,3%) and Pterocarpus indicus (8,45%). The tree diversity index (H’) and Evenness index (E) showed a medium score of 2.48 and 0.59. The edible trees covered only 14.38% of the total trees dominated by fruit trees of Tamarindus indica, Gnetum gnemon, Mangifera indica, Muntingia calabura and Manilkara kauki. Most of them were in the local street of the settlement area. Conclusion: The greenery should be improved by increasing the number of trees, number of species, intensive maintenance and enhancing productive values of trees. Applying productive urban landscape at roadside greenery of Yogyakarta City has not been optimal yet at all types of roadside.
Research Article
Effects of Durian Wood Waste Biochar on Acid Sulphate Soil Properties and Rice Yield in Indonesia
Evy Setiawati, Sugeng Prijono, Diah Mardiana, Wahida Annisa and Soemarno
Background and Objective: Millions of hectares of acid sulphate soils in Indonesia have been cultivated with low yield. The study was carried out to analyze the rate of durian wood waste biochar to improve soil properties and rice yield on acid sulphate soil. Materials and Methods: The research was performed from September, 2017-July, 2018. Biochar was made by pyrolysis of feedstock at 550°C for 2 h and quenched with water. The treatments were biochar rates of 4, 8, 12, 16 and 20 t ha1 which added on the acid sulphate soil. Analyses of soil characteristics were made at the end of vegetative, generative and harvest phases. This study was used completely randomized design (CRD) with three replications. Results: Along with increasing biochar rate and planting periods, the properties of acid sulphate soils were significantly increased, except for exchangeable Mg. There was no significant difference in plant growth with different rate of biochars, meanwhile, increasing biochar rate significantly increased the filled grain weight of rice. Conclusion: At the end of vegetative, generative and harvest phases, biochar rate had positive effects on pH-H2O, SOC, available P, total N, total K, exchangeable bases of Ca, K, Na and CEC. Durian wood biochar provided the optimum weight of filled grain at a rate of 15.29 t ha1 and maximum plant height of 16.47 t ha1 in the acid sulphate soil.

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