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The Morphology Characteristics of Plant Gambir (Uncaria gambire Roxb.) in Pakpak Barat District Sebayang, Lukas; Afni Hardyani, Mieke
Jurnal Online Pertanian Tropik Vol. 7 No. 2 (2020): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Gambier (Uncaria gambire Roxb) is plantation sector sub commodity which was generally managed by people traditionally but that gambir is exporting commodity only some of consumed by small of society. Gambier plant type that exist in Pakpak Bharat generally not been known as morphology. It is caused by lack of knowledge of community resources Bharat Pakpak to know specifically the type of plants are planted gambier. For that survey gambir plant morphological characteristics in some areas as the center of the district gambir Pakpak Bharat in May-August, 2017. The purpose of this study was to obtain data and information about the types / varieties of gambier plants cultivated by farmers in Pakpak Bharat Regency. The results obtained from the characteristic aspects of plant morphology there are 4 types / types of plant gambier Pakpak contained in Bharat. 4 types of plant gambier it: (1) Type of reddish leaf , known as "siarang" (2) Type of leaf shape is wider and longer (3) Type of leaf is narrower and more short and (4) Type of leaf are thicker and greener leaf. Key words : Characteristic, type, gambier plant

Potato Cultivation Technology for Increasing Famers Income in Area Exposed to the Eruption of Mount Sinabung, Karo District Sebayang, Lukas; Mieke Afni Hardyani
Jurnal Online Pertanian Tropik Vol. 8 No. 2 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

The negative impact of land exposed to the eruption of Mount Sinabung can be improved through the provision of soil amendments and improvement of soil fertility so that the physical and chemical properties of the land are suitable for potato plants. This study aims to compare the potato cultivation technology package recommended by the North Sumatra AIAT with the farmer technology package on land exposed to the eruption of Mount Sinabung. The experiment was conducted in one of the potato production centers that experienced the impact of the eruption in Kutarayat Village, Naman Teran District, Karo Regency, located 3 km from the eruption center from January - December 2019. The treatment of the cultivation technology package studied were: 1). Recommended technology package: Soil processed twice, dolomite 2 tons/ha, manure sown in arrays 20 tons/ha, sawdust 5 tons/ha, NPK 500 kg/ha, urea 100 kg/ha, KCl 100 kg/ha; 2). Farmer's technology package: soil is processed once, manure in holes 10 tons/ha, NPK 250 kg/ha, urea 100 kg/ha, KCl 100 kg/ha. The results of the study showed that: (1) the growth of potato plants that received the recommendation package cultivation technology treatment was better than the farmers' technology package. (2) potato tuber production with the application of recommended technology resulted in the highest tuber production of 39.81 t/ha, while the farmer's cultivation technology package was 23.79 t/ha. (3) Likewise, the weight of large tubers (> 200 g/tuber ) was significantly higher and more abundant than the farmers' technology package. Potato planting with the recommendation package input resulted in the highest tuber production of 39.81 t/ha. Economically profitable with a B/C ratio of 2.69. Key words: Potato, eruption, mount Sinabung, technology package

CO2 MEASUREMENT IN PALM OIL PLANT IN PEATLAND Sebayang, Lukas; Marpaung, Imelda S
Jurnal Online Pertanian Tropik Vol. 9 No. 2 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Peatlands are one of the contributors to greenhouse gas emissions because it is estimated that the carbon stock stored in them is around 528 Giga tons (Gt) or equivalent to 75% of the total carbon (C) in the atmosphere, so that if peat is oxidized it will cause carbon to be released into the air. The conversion of forest land to agricultural land can be one of the causes, including the activity of making drainage channels. The construction of drainage channels causes a decrease in the water table so that the volume of peat under aerobic conditions increases while increasing the activity of microorganisms in decomposing peat. Peat decomposition and root respiration contribute to carbon emissions. This study aims to determine the CO2 concentration in several conditions of oil palm roots. CO2 measurement by survey method on oil palm plantations, using the IRGA (Infra Red Gas Analyzer). Measurements are carried out once per month from January to May 2020 for 3 minutes. The point of observation was determined by 2 factors with 3 treatments and 3 replications. Factor 1 is the observation point in the area of accumulation of midrib pieces and other litter (B1) and factor 2 is the observation point in the road area around the tree (B2). While the treatments were (A1) natural roots, (A2) roots were cut when the measurements were going to be taken and (A3) roots were cut and permanently restricted. The results of the measurement of the highest average concentration of CO2 changes from 0 minutes to 3 minutes in January were in treatment B1A3 (140.4 ppm), February in treatment B2A3 (103.9 ppm), March B1A3 (124.6 ppm) ppm), April B1A3 (143.8 ppm) and May B1A3 (110.7 ppm). Meanwhile, the lowest concentration of CO2 changes from 0 minutes to 3 minutes in January was in treatment B1A1 (71.5 ppm), February in treatment B1A1 (25.7 ppm), March B2A3 (40.2 ppm), and March B2A3 (40.2 ppm). April B2A1 (30.6 ppm) and May B1A1 (43.2 ppm). From the measurement results, it can be concluded that the highest concentration of CO2 and its changes was in treatment B1A3, namely in the treatment of cutting roots with permanent blocks, while the concentration of CO2 and its reduced changes was in the treatment of natural roots (A1) both in Blocks B1 and B2.

Land suitability Assessment Rubber Commodities ( Hevea brasiliensis) In Nias Selatan District Scale 1: 250,000 Sebayang, Lukas
Jurnal Online Pertanian Tropik Vol. 10 No. 2 (2023): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jopt.v10i2.12210

South Nias district was the new district developed of Nias district in 2003. South Nias was part of area hit earthquake and tsunami in 2004 and 2005. The district was the producer of rubber which second superiority commodities after coconut. There were 29,125 Ha of rubber area in South Nias (Statistic of Sumatera Utara Province. 2021). This research activity was carried out in 6 subdistricts in Nias Regency in January 2019 - November 2019. Assessment of land suitability was needed in order to know a directions of superiority commodities development area. This assessment was conducted by using ALES (Automated Land Evaluation System). SDPLE (Standard Procedure for Land Evaluation) data was imported to ALES program. Land evaluation result was show in spatial form. This form made by imported tabulation data to GIS (Geographical Information System) form. Suitability land maps (scale 1 : 250.000) present based on each commodities by ArcView program. Keywords : Suitability land; rubber; South Nias

Land Suitability Assessment Gambir Commodities (Uncaria gambir Roxb.) In Pakpak Bharat Distric Scale 1 : 50.000 Sebayang, Lukas
Jurnal Online Pertanian Tropik Vol. 11 No. 1 (2024): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jopt.v11i1.15868

Gambier (Uncaria gambier Roxb.) is a cultivated plant regeneration in Pakpak Bharat. Gambir extract benefits as well as the pharmaceutical industry and traditional is quite interested so that market opportunities gambier quite open for the domestic market and abroad. Land potential and development opportunities gambir high enough, it is in the use of plantation area of 1,225 ha and optimization of dry land area of 16.049,6 ha (Pakpak Bharat in Figures, 2022). Gambier development in Pakpak Bharat tends to increase, so it is necessary to study the suitability of land to see the direction of the development of the appropriate location. This assessment was conducted by using ALES (Automated Land Evaluation System). SDPLE (Standard Procedure for Land Evaluation) data was imported to ALES program. Land evaluation result was show in spatial form. This form made by imported tabulation data to GIS (Geographical Information System) form. Suitability land maps (scale 1 : 250.000) present based on each commodities by ArcView program. Key words : Land Suitability, gambier, Pakpak Bharat

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