bluuebunny/crossref_metadata_2025_split huggingface dataset:
Estimation of Frigate Tuna (Auxis thazard) resource potential from Sibolga Waters
Authors: Fadhilah A , Juniyanti D , Soemaryono Y , Susetya I E 
Published: April 2020

Abstract
Frigate Tuna (Auxis thazard) is one of commercial production of large pelagic fish fisheries in Sibolga Waters. The high demand for this fish has led to large-scale fishing practices that can disrupt the balance of fish populations in nature. Therefore, the objectives of the present study were to determine the maximum sustainable potential (Maximum Sustainable Yield), optimum effort (fopt), and to find out the level of utilization, effort and catch of Frigate Tuna allowed. The secondary data analysis was using the Fox model. The results showed that the sustainable potential (MSY) of Frigate Tuna resources from Sibolga Waters amounted to 7,664.108239 kg/year with fopt value was 2, 539.025526 trips/year. utilization rate over the past 5 years has an average value of 153.2106% and an effort rate of 123.01%. It is concluded that the utilization resource level of Frigate Tuna from Sibolga Waters has been overfishing.
Analysis of community structure of grouper fish catches (Serranidae) in Medang Deras District, Batubara Regency
Authors: Fadhilah A , Setiani T P , Susetya I E , Soemaryono Y , Yusni E 
Published: April 2020

Abstract
Grouper fish is the catch of traditional fishermen in the district of Medang Deras, Batubara Regency, Sumatera Utara Province. Sampling was carried out at two landing stations located in the District of Medang Deras, Batubara Regency. This study aims to determine the value of diversity indices, evenness indices and dominance of grouper catches. The catch of Grouper fish landed in Medang Deras District, all come from the Serranidae family of nine species, and two genera. The Diversity Indices value of grouper at Station I 1.62 and Station II 1.38. The Evenness Indices value at station I 0.74 and at station II 0.71. The Dominance Indices value at station I 0.26 and at station II 0.30. While the temporal indices value of grouper diversity in May 1.74 and in June 1.60, the Evenness Indices in May 0.79 and in June 0.77. The Dominance Indices value in May 0.22 and in June 0.25.
Analysis of heavy metal of copper (Cu) and lead (Pb) at Siombak Lake North Sumatera Province
Authors: Yusni E , Ifanda D 
Published: April 2020

Abstract
This research to knew heavy metal concentrate of copper (Cu) and lead (Pb) in the water and sediment. From this results showed indicated physics chemical parameter of Siombak Lake stilled in the normal range. The concentrations heavy metal copper (Cu) in the water column all the stations in sequence 0.525 mg/l, 0.54 mg/l, 0.51 mg/l and then the concentration heavy metal lead (Pb) in the water column 0.00165 mg/l, 0.0156 mg/l, 0.0148 mg/l. While heavy metal concentration of copper (Cu) in the sediment all the stations in sequence 2.68 mg/kg, 2.47 mg/kg and 21.54 mg/kg and then concentration of heavy metal lead (Pb) of 6.045 mg/kg, 7.17 mg/kg and 4.77 mg/kg. This result indicated the concentration of heavy metal copper and lead in the water column had exceeded the quality standard and concentration of copper and lead in sediment had not exceeded the quality standard.
Spatial distribution of mangroves in tidal lake ecosystem
Authors: Muhtadi A , Yulianda F , Boer M , Krisanti M 
Published: April 2020

Abstract
Siombak Lake is a tidal lake whose waters are affected by Belawan tidal in the Malacca Strait. The characteristics of the waters are dynamic, especially its salinity. The existence of salinity causes the lake and the surrounding area growth by mangrove. This study aims to map the distribution and condition of mangrove forests in Siombak Lake. This research was carried out in Siombak Lake, Medan City, North Sumatra Province in August 2019. The data were collected of mangrove vegetation and density at the study site. The results of research on Siombak Lake found 14 species of mangrove. There are 2 species of mangrove that is rarely found before, that is found at the research location, namely the powder-puff tree and looking glass tree. Nipa palm and mangrove apple are mangrove species that have the highest distribution and density in the Siombak Lake ecosystem. The condition of mangroves at the Siombak Lakeside is in damage to good condition, while in the Siombak Lake ecosystem can be said in good condition.
Relationship between substrate characteristics and abundance of Polychaeta in Tanjung Tiram Waters, Batubara Regency, Sumatera Utara Province
Authors: Susetya I E , Fadillah P , Leidonald R , Fadhilah A 
Published: April 2020

Abstract
The existence of polychaeta in water is very important to support the life of organisms and illustrate the fertility of the waters. This study aims to measure the content of C-organic in the substrate and determine the relationship of substrate characteristics to the diversity of polychaeta. This research was conducted in the waters of Tanjung Tiram, Batubara Regency, North Sumatra Province in June-July 2019. Determination of the location of sampling using a purposive sampling method at three stations. Intake of C-organic and Polychaeta by placing 3 plots horizontally at each observation station. The results obtained by an average of C-organic content with a range of values of 0.56% - 2.48%, found 12 species of polychaeta and diversity values ranging from 0.52 to 1.92, including the medium category. Pearson’s correlation between polychaeta diversity and C-organic has a negative relationship.
The role of shallot extract concentration application on soybean varieties production
Authors: Hasanah Y , Sitepu F E , Yanti D 
Published: April 2020

Abstract
The application of natural plant growth regulator (PGR) is one treatment that plays a role in increasing soybean production. One of the natural PGR that can be used is shallot extract. The objective of the research was to evaluate the role of shallot extract application on soybean production. The research was done at the Faculty of Agriculture Experimental Field, Universitas of Sumatera Utara using a Factorial Randomized Block Design with two factors and three replications. As the first factor were soybean varieties (Devon-1, Dering-1 and Anjasmoro). The second factor was the concentration of shallot extract (0%; 25%; 50% and 75%). The results indicated that Dering-1 has the highest number of filled pods, while Anjasmoro and Devon-1 soybean varieties produced a higher harvest index and dry weight of 100-seeds compared to Dering-1. The application of shallot extract concentration at 75% has produced the highest number of filled pods, seed dry weight per plant and harvest index. The interaction between Dering-1 variety and the concentration of 75% shallot extract produced the highest number of filled pods, while application of 50% shallot extract in Devon-1 variety produced the highest harvest index and dry weight of 100 seeds.
Appropriate stimulant application to determine latex physiology character and production of clone RRIM 921 in Regency of Deli Serdang
Authors: Purwaningrum Y , Asbur Y , Rambe R D H , Hanum C 
Published: April 2020

Abstract
Physiological characteristics of rubber trees are closely related to the ability to form latex. Sucrose, inorganic phosphate, and thiol levels in latex are physiological characters. The purpose of this study was to determine the correlation between physiological characters and latex production of clone RRIM 921 and proper stimulant application without disturbing the health of rubber trees. This research was conducted at PT. Perkebunan Nusantara III (Persero), Sei Putih Farm, and Physiology Laboratory of Sungei Putih Research Institute in 2018. The clones tested in this study were 17 years old of clone RRIM 921. This study uses correlation statistical analysis and regression test. Correlation analysis show that Pi level has negative significant correlation with Thiol latex, where high level of Pi will be followed by low level of thiol and vice versa. Latex production of clone RRIM 921 in May, June and July were not affected by latex physiology. The right stimulant application after leaf fall for RRIM 921 is in May.
Individual selection of roselle plant m4 generation (Hibiscus sabdariffa l.) based on anthocyanin, vitamin c and water content
Authors: Nasution S A , Sembiring M , Siregar L A M , Hanafiah D S 
Published: April 2020

Abstract
Mutation of a plant is included to be one of the most effective methods to create a high genetic diversity in plants. This study aimed to get the selected individuals of M4 generation of Roselle (Hibiscus sabdariffa L.) in rows through gamma-ray irradiation based on the flower calyx production, the content of anthocyanin and vitamin C. This research used Roselle seed of Roselindo 2 variety (control) as many as 16 numbers selected selection. The study was conducted at the Agrotechnology field Universitas Sumatera Utara (± 25 m asl) starting from December 2018 until April 2019 with the germination date of December 7, 2018. The data obtained were tested using a t-test analysis and presented descriptively. Results showed that the observation of all the average dry weights of plants−1 did not show any significant effect between one and other plants (control and number of selected plants). The average wet weight of plant−1 showed a significant effect in plant numbers of R141 and R148 compared to the other sample numbers. Levels of plants−1 parameters of anthocyanin and vitamin C showed a significant effect between one plant to another in all plant numbers (control and number of selected plants).
The roles of FMA in increasing growth and effectiveness of soybean roots on dry land supporting sustainable agriculture in Deli Serdang District
Authors: Nasution L Z , Hanum C , Delvian  
Published: April 2020

Abstract
Soybean cultivation in dry land is an agricultural intensification effort to increasing soybean production. The application of biological fertilizer like FMA contributes to increase growth and plant development, also supporting eco-friendly agriculture. The purpose of this research is to determine the role of FMA in the improving the growth and effectiveness of soybean rooting on dry land to support sustainable agriculture in Deli Serdang district. This research was conducted at BBI Tj. Selamat, Deli Serdang district in June-August 2019. Parameters observed were plant height, FMA colonization percentage, and soybean root volume. The results showed that the treatments of M0 (control), M1 (4 gr FMA), M2 (8 gr FMA), and M3 (12 gr FMA) did not significantly affect plant height and root volume, but significantly affected the FMA colonization percentage in the roots of soybean. The lowest FMA colonization percentage was obtained at M0 treatment (2.33%), while the highest was shown in M2 treatment (2.67%).
Morphological identification of local raru producing trees from Sibuluan Nauli, Central Tapanuli, North Sumatera
Authors: Susilowati A , Iswanto A H , Kusuma Y S , Rachmat H H , Elfiati D , Larengkeng S H , Ginting I M , Rangkuti A B 
Published: April 2020

Abstract
Raru is a local name referring to those of wild tropical trees belonging to the member of Dipterocarpaceae family which are targeted by illegal logger for its wood and bark. Raru wood is widely used for buildings and furniture, while its bark is used for medicinal purposes. Raru tree has disjunctive distribution in Sumatera and Kalimantan with different species variations. The high demand on raru wood has led to population decrease in their natural distribution, meaning that conservation is needed for this species. Species identification is the initial step to determine diversity and relatedness among raru species. The objective of this study was to identify the morphological character of local raru trees in Sibuluan Nauli and to determine their phylogenetic relatedness. Morphological identification was conducted by observing and measuring the stem, leaf, canopy, and resin characters. The results of morphological analysis showed that there were variations in morphological characters of local raru tree species. The phylogenetic identification of songal raru, dahanon raru, pulut raru, and jonggi raru showed that songal raru and pulut raru were not closely related, with genetic distance of 0.8473 while the n dahanon raru and jonggi were closely related, with genetic distance of 0.3878.
The role of Magnesium Sulphate in the formation of chlorophyll and density of stomata of soybean varieties (Glycine max (L.) Merril)
Authors: Hasanah Y , Mawarni L , Hanum H , Hanum C , Nasution M R 
Published: April 2020

Abstract
Magnesium is a very important nutrient for the formation of chlorophyll and affects the density of stomata. The aim of the research was to evaluate the role of magnesium in the formation of chlorophyll and stomatal density. The study was conducted in Deli Tua, Deli Serdang Regency, Sumatera Utara from May to August 2019. The experimental design used was a factorial randomized block design. As the first factor, soybean varieties consist of Demas, Devon-1, Anjasmoro, Dering-1. The second factor is dose of magnesium applied consisting of 0; 100; 200 and 300 kg MgSO4/ha. The research result indicated that the highest total chlorophyll was found in Dering-1 compared to other varieties. The highest of stomatal density was found in Demas variety. The highest of chlorophyll total was found in the treatment of 100 kg MgSO4/ha on Dering-1 variety, while the highest stomatal density was found in the control treatment (0 kg MgSO4/ha) on Demas variety.
Mapping bacterial leaf blight disease of rice (Xanthomonas oryzae pv oryzae) in North Sumatra
Authors: Safrizal  , Lisnawita  , Lubis K , Maathuis F J M , Safni I 
Published: April 2020

Abstract
Bacterial leaf blight is the most important rice disease in Indonesia and other rice producing countries in Asia. Bacterial leaf blight disease, caused by the bacterial pathogen Xanthomonas oryzae pv oryzae, has a wide distribution in the tropics and sub-tropics. This research was aimed to determine the distribution of the disease in North Sumatera. The research experiment was conducted using the survey method to calculate the incidence and severity of disease in rice crops in seven locations. The highest disease incidence was found in Sumber Tani Village, Batubara District, and in Talawi Siabal Abal Village, Sipahutar District of North Tapanuli with a disease incidence of 100%. The highest percentage of disease severity was found in Siabal Abal Village, Sipahutar District of North Tapanuli, with a percentage of 82% severity.
Response of some soybean (Glycine max L. Merrill) varieties on flooded conditon with application of Benzyl Amino Purine (BAP) and Salicylic Acid (SA) in the R3 phase
Authors: Damanik R I , Manurung D , Bayu E S , Rahmawati N 
Published: April 2020

Abstract
Soybean production (Glycine max (L.) Merril) in Indonesia has fluctuation every year. The area of wetlands in Indonesia is about 24.5 million ha, but only about 8.5 million ha of wetlands are used as rice fields, the remaining 16 million ha have not been utilized. The study aims to determine the response of some soybean varieties on the application of benzyl amino purine (BAP) and salicylic acid (SA) in flooded conditions. The research initiated in research land of the Faculty of Agriculture Universitas Sumatera Utara, using the Randomized Block Design (RBD) with 3 treatment factors namely varieties consisting of 3 varieties (Demas 1, Dering 1 and Burangrang), the concentration of plant growth regulator consisting of 3 levels (control, 50 ppm BAP + 100 ppm of SA and 100 ppm of BAP + 200 ppm of SA) and the treatment of flooding stress consisting of 2 treatments (control and flooded). The results showed that the varieties had critical effect on the parameters of number of pods per plant and the weight 100 seeds. Synthetic plant growth regulator concentration had no effect on all the observation parameters, but flooding stress had significant induce on the parameter of number of pods per plant.
Polymorphism levels of some SSR markers (Simple Sequence Repeat) for parental line identification on low temperature tolerance
Authors: Dalimunthe S R , Siregar L A M , Putri L A P , Chairunnisa T , Hairmansis A 
Published: April 2020

Abstract
Breeding rice varieties suitable for low temperature areas is very important to support food self-sufficiency. Identification of polymorphic markers assumed to be associated with low temperature tolerant properties is essential for mark-based selection applications in the context of low temperature tolerant rice variety development. The study was conducted to identify 5 rice genotypes to be used as a low temperature tolerant donor hybrid using 11 SSR markers. PCR product amplification was separated using 3% agarose gel and 8% electrophoresis polyacrylamide gel (PAGE). The level of information of a mark can be determined by calculating the Polymorphic Information Content (PIC). The study was conducted in May - July 2017 at the Laboratory of Molecular Biology, Centre for Research and Development of Biotechnology and Genetic Resources of Agriculture, Bogor. The results showed that 6 SSR markers were polymorphic and 5 markers were monomorphic. CT234 and CT235 markers have the highest PIC value (0.375) compared to 9 other markers. SSR markers and specific gene markers used to identify low temperature tolerant rice show that Ciherang and Sigambiri Putih crossbreeding can be recommended as a crossing parents because it has the most distant genetic (0.431).
Adaptability of tissue-cultured Dendrobium orchid planlets on planting media and its position during acclimatization process
Authors: Nasution L Z , Hasibuan M , Manurung E D 
Published: April 2020

Abstract
The acclimatization process of cultured plants needs special attention because it is a critical period for adaptation to In-Vivo conditions. The environmental changes and the imperfection of planlet anatomy are important things that need to be considered to support the growth of Dendrobium orchid planlet. The aim of this study was to determine the effect of planting media type and its positioning on the Dendrobium orchid adaptability during acclimatization process. This study was conducted from March to Mei 2017 in AIAT North Sumatra tissue culture laboratory and screen house. The experimental design used in this study was a randomized group design with five replications. The treatment consisted of planting media and pot position model. The planting media combination were fern+wood charcoal (M0); fern+coconut fibre (M1); ferns+broken bricks (M2); fern+wood charcoal+coconut fibre (M3); and ferns+wood charcoal+coconut fibre+broken bricks (M4) while the pot position model were laying (P0) and hanging (P1) model. Morphological parameters observed were growing plant percentage, plant height, leaves number, roots number, and roots length. The results showed that the best planting media and pot position combination supported the Dendrobium orchid growth were found in ferns and wood charcoal (M0) and ferns and bricks (M2) with lying model (P0).
Key agronomic management factors for maximising oil palm (Elaeis guineensis Jacq.) yields on acid sulphate soils in Malaysia and Indonesia
Authors: Pupathy U T , Sundian N 
Published: April 2020

Abstract
In Malaysia, approximately 110,000 ha of acid sulphate soils are estimated to occur mostly along the west coast, while about 102.80 million ha are under acidic nature in Indonesia. Acid sulphate soils generally have significant amounts of free and absorbed sulphate, pale yellow mottles of jarosite along old root channels and on ped surfaces with pH (in water) below 4. These soils are high in Aluminium (Al) and phosphorus (P) fixation capacity, contributing towards their low fertility which limits the normal growth of oil palm (Elaeis guineensis Jacq.). However, Fresh Fruit Bunch (FFB) production in oil palm was improved significantly when water level in the field drains was maintained up to 60cm from soil surface mainly to cover jarosites and pyrite layers. Application of organic fertiliser mainly of Empty Fruit Bunches (EFB) and Palm Oil Mill Effluents (POME) to oil palm land proved to be beneficial as significant FFB yield up to 35 ton/ha/year was obtained in field trials. Maintaining water table in the drains to cover the pyritic horizon in order to inhibit further oxidation would be an important management tool for managing oil palms on acid sulphate soils.
The effect of oyster mushroom baglog compost on the growth and production some local genotypes of purple sweet potato (Ipomoea batatas L.)
Authors: Prabowo H , Rahmawati N , Sitepu F E T 
Published: April 2020

Abstract
The use of compost is effective to improve the physical, biological and chemical structure of the soil, which makes plant growth and yield better. The purpose of study was to determine the effect of oyster mushroom baglog compost on the growth and production of several local purple sweet potato genotypes (accessions of Dolok Perdamean with purple tuber, accessions of Silimakuta with purple tuber, accessions of Sumbul with purple tuber, and accessions of Parbuluan with purple tuber) on the various doses of oyster mushroom baglog waste compost application (0, 10, 20, 30 ton/ha). This research was conducted at Jl. Idi Gang Eka Dewi, Medan Johor Subdistrict, from the end of December 2018 to June 2019. The results showed that the administration of oyster mushroom baglog compost gave a good influence on the growth and production of some local purple sweet potato genotypes. The accession of Sumbul with purple tuber had produces the highest growth plant stem length, while the Dolok Perdamean accession with purple tuber had produces the highest on B class tuber grading. The application of oyster mushroom baglog waste compost markedly improves on A class tuber grading. The best dose of oyster mushroom baglog waste compost was 30 tons/ha.
The production of sugarcane (Saccharum officinarum L.) bud sett at the various ages of planting material and storage time
Authors: Meiriani  , Sitepu F , Siahaan L 
Published: April 2020

Abstract
The best age and storage time of planting material sugar cane bud sett need to be known for sending of planting material bud sett that usually far from nurseries. This study aimed to determine the production of sugar cane (Saccharum officinarum L.) using bud sett planting materials at the various ages (6 months, 7 months, and 8 months) and storages (3 days, 6 days, 9 days, and 12 days). This research was carried out on the land of the Faculty of Agriculture, Universitas Sumatera Utara, Medan, starting in July 2018 - July 2019. The results showed that the best production was obtained from the use of bud sett aged 7 months and stored for 3 days. The use of bud sett aged 6 and 7 months can be stored up to 9 days, while the use of bud sett aged 8 months can be stored up to 6 days where the results were not significantly different with the use of 7 months planting material and storage for 3 days.
Grain yield and yield attributes response of four upland rice (Oryza sativa L.) promising lines to shade stress
Authors: Sadimantara G R , Febrianti E , Suliartini N W S , Sutariati G A K , Yusuf D N , Muhidin  
Published: April 2020

Abstract
The purpose of this research was to investigate a response of four promising lines of upland rice (Oryza sativa L.) on low-light environments. The study was carried out at the Agronomy Field Laboratory, Faculty of Agriculture, Halu Oleo University Kendari and arranged on split plot design on two factors. The different shade level placed as the main plot and different promising lines as subplot. The observed variables were number of productive tillers, panicle length, the number of unfilled grains and grain yield (t ha−1). The results indicate that both the shade levels and upland rice promising lines affected the grain yield and yield attributes. The shade levels tend to decrease grain yield and increase unfilled grain. The GS12-1 lines recorded as a better promising line, especially for the panicle length and grain yield (t. ha−1).