North Sumatera University Research Articles

DETERMINATION TYPE OF ALLOPHANE ON ANDISOL IN DOLAT RAKYAT VILLAGE TIGA PANAH DISTRICT, REGENCY OF KARO

The aim of the research was to determinate the type of Allophane minerals by means of Thermogram and to know the type of Allophane minerals with Allophane–Organic Matter relations. The research was done in Dolat Rakyat villages, District of Tiga Panah Karo Regency, In Soil Fertility Laboratory University of North Sumatera, and College of Chemical Industry (PTKI), Medan in June - October 2014. Soil type is Andisol. The result of the research in Dolat Rakyat Village Tiga Panah District, Regency of Karo Thermogram interpretation showed that type of Allophane minerals Andisol that is Allophane B. Allophane-Organic Matter relations showed that type of Allophane minerals is Allophane B with positive relations between Allophane-Humic Acid; negative relations between Allophane-Fulvic Acid, and Allophane-Humic Acid+Fulvic Acid.

Pengaruh Pemberian N 2,4-D Terhadap Pertumbuhan Dan Metabolisme Kalus Kedelai Pada Kondisi Hipoksida Secara Invitro

Soybean demand continues to increase as the number of people , but the production has not be enable to meet the needs of national soybean. One effort to increase production is to indentificat soybean acreage of inundation. The aims of the research was to determine about Identification callus of soybean toward inundation by in vitro. This research was carried out in The Tissue Culture Laboratory, Agriculture’s Faculty Of North Sumatera University from August to March 2015. Completely Randomized Design with two factors was used, first factor was auxin 2,4-D concentration consist of three leevels : 0 ppm; 2 ppm; 4 ppm. The second factor was Inundation and without Inundation. The parameters measured were are visualization of callus, percentage of growth callus, percentage of weight callus , the amount of chlorophyll a and b, and concentration of protein. The results showed that 2,4-D concentration and Inundation give significant effect on visualization of callus, percentage of growth callus, percentage of weight callus , the amount of chlorophyll a and b, and concentration of protein , but it have no significantly effect on the formation of chlorophyll a in the phase of inundation and interactions between as given significantly effect on all parameters. Keywords : 2,4-D, Hipoksida, In vitro Soybean demand continues to increase as the number of people , but the production has not be enable to meet the needs of national soybean. One effort to increase production is to indentificat soybean acreage of inundation. The aims of the research was to determine about Identification callus of soybean toward inundation by in vitro. This research was carried out in The Tissue Culture Laboratory, Agriculture’s Faculty Of North Sumatera University from August to March 2015. Completely Randomized Design with two factors was used, first factor was auxin 2,4-D concentration consist of three leevels : 0 ppm; 2 ppm; 4 ppm. The second factor was Inundation and without Inundation. The parameters measured were are visualization of callus, percentage of growth callus, percentage of weight callus , the amount of chlorophyll a and b, and concentration of protein. The results showed that 2,4-D concentration and Inundation give significant effect on visualization of callus, percentage of growth callus, percentage of weight callus , the amount of chlorophyll a and b, and concentration of protein , but it have no significantly effect on the formation of chlorophyll a in the phase of inundation and interactions between as given significantly effect on all parameters. Keywords : 2,4-D, Hipoksida, In vitro

Respon Pertumbuhan Bibit Kakao (Theobroma cacao L.) terhadapPemberian Pupuk Guano dan KCl

Addition of guano in cultivation of cacao seedling is the one step to use organic fertilizer thatcomes from animal feces and it is used to add soil nutrient for the growth of cocoa seedlings, aswell addition of KCl is used to add soil nutrient too. For that purpose addition guano and KCl aimsto increase growth of cacao in cultivation of seedling. This research had been conducted atexperimental field of agriculture fakulty University of North Sumatera in October 2013 - January2014 using factorial randomized block design with two factor, i.e. addition dose of guano (0, 75 ,150, 225 g/polibag) and dose of KCl (0, 2, 4 g/polibag). Parameter observed were cacao height,cacao stem diameter, cacao leaf number, total leaf area of cacao, shoot fresh weight of cacao, shootdry weight of cacao, root fresh weight of cacao, root dry weight of cacao ,and cacao shoot rootratio. The result showed that parameter cacao height, cacao stem diameter, total leaf area of cacao,shoot fresh weight of cacao, shoot dry weight of cacao, and cacao shoot root ratio weresignificantly to addition guano but total leaf areaof cacao, root fresh weight of cacao, root dryweight of cacao,and cacao shoot root ratio were not significantly to addition guano.The best resultin addition guano is 225 g/polibag that produce shoot dry weight of cacaoas 11.57 g. All parameterswere not significantly to addition KCl and the interaction of two factor. The best resultofcombination is 225 g/polibag of guano and 4 g/polibag of KCl, that produce root dry weight ofcacao as 1.76 g.Keywords :guano, KCl, cacao seedlings.

Efisiensi Pemupukan P Terhadap Pertumbuhan dan Produksi Tanaman Jagung(Zea mays L.)pada Tanah Andisol dan Ultisol

ABSTRACTAn experimental research was done to measure the nutrient use efficiency (NUE) of Phosphorus (P)in Andisols and Ultisols. The research was conducted in Screenhouse and Research and TechnologyLaboratory, Faculty of Agriculture, University of North Sumatera from September 2012 until July2013. It was arranged in Non-factorial Randomized Block Design with 6 dosages of PhosphorusFertilizer (SP-36) in Andisols and Ultisols (0; 0,4; 0,8; 1,2; 1,6; and 2,0 grams of SP-36/plant). The intertreatments effects were analyzed using DMRT.The results showed thatRecovery Efficiency (RE) and Agronomic Efficiency (AE) in Ultisols are higher than in Andisols,meanwhile Physiological Efficiency (PE) in Andisols is higher. RE and AE were decreased as aresult of increasing dosage of SP-36 meanwhile PE was increased. The best treatment in Andisolsand Ultisols is 0,8 grams SP-36/plant. In Andisols, productivity of maize at that treatment is 109,23grams/plant (7,28 tons/Ha); RE (11,55%); PE (576,67 grams dry weight cob of maize /g P2O5);and AE (66,68 grams dry weight cob of maize /g P2O5). In Ultisols, productivity of maize at thattreatment is 67,30 grams/plant (4,48 tons/Ha); RE (15,16%); PE (589,29 grams dry weight cob ofmaize /g P2O5); and AE (88,94 grams dry weight cob of maize /g P2O5)Key words : Nutrient Use Efficiency (NUE), phosphorus (P), andisols, and ultisols

POTENSI BERBAGAI TANAMAN SEBAGAI INANG INOKULUM MIKORIZA ARBUSKULAR DAN EFEKNYA TERHADAP PERTUMBUHAN TANAMAN JAGUNG DAN KEDELAI DI TANAH ULTISOL

The objective of this research would be to examine the micorrhyze inoculum quality of severaltypes of hosts using ultisol as growing medium on maize and soybean growth. The research hasbeen conducted in greenhouse and laboratory of Biotechnology of Soil, Faculty of Agriculture,North Sumatera University. To achieve this objective, a non-factorial group random sampling hasbeen used through some treatments: J J (maize was applied with mycorrhyze inoculum of maize), DJ (maize was apolied with mycorrhyze inoculum of soybeans), S J (maize was applied withmycorrhyze inoculum of setaria grass), T J (maize was appolied with mycorrhyze inoculum ofgroundnuts), J D (soybean was applied with mycorrhyze inoculum of maize), D D (soybean wasapplied with mycorrhyze inoculum of soybeans), S D (soybean was applied with mycorrhyzeinoculum of setaria grass), T D (soybean was applied with myzoerhyze inoculum of groundnuts).The result of research indicated that application of myzorrhyze inoculum of maize, soybean,groundnut and setaria grass to maize and soybean plants has not significant effect of increassing theheight of plants, wet weight of shoot, dry weight of shoot, wet weight of root, degree of rootinfection, uptakes of N and P in plants of maize and soybean plants.Keywords: host, mycorrhyze inocolum, maize, soybean, groundnut, and setaria grass

Motivasi Belajar Bahasa Mandarin sebagai Bahasa Kedua

The goals of article was to explore students’ main motivation in learning Mandarin as second language acquisition and the difference motivation between Chinese-descending and non-chinese students. There were 276 respondents chosen by purposive sampling from three universities. They were students from Mandarin Department of Bina Nusantara University, Jakarta, Darma Persada University, Jakarta, and North Sumatera University, Medan. A cooperation on deciding research instruments was collaborated with Faculty of Tionghoa Language and Literature of Huaqiau University, China. Descriptive analysis was done to explore students’ main motivation in learning Mandarin, continued by different tests to know the different motivation between native and descending students. Research results indicated that the motivation in learning language is low; there is no significant difference between integrative and instrumental motivation. Also, there was no motivation significant different between chinese-descending dan non-chinese students in learning Mandarin. Lecturers should develop their methods of teaching to develop students’ learning motivation in learning Mandarin.

Am I Information Literate? and How Library Support My Information Needs?

Article clarifies information literacy (IL) implementation that is recognizing information needs, finding information, valuing, selecting information, creating new information and presenting it to get some inputs, applied in Cornel University, Dayton University, North Sumatera University, Duta Wacana University, and Bina Nusantara University. Data were collected by library research. It can be concluded that IL implementation in some mentioned universities have met the IL standards, IL is needed to develop students’ knowledge, skills, and performance, some IL have applied in the formal teaching activity, so that it needs to be researched so that all parties are satisfied and the goal of study can be achieved.

Pengaruh bioaktivator terhadap pertumbuhan sukun (artocarpus communis forst) Dan perubahan sifat kimia tanah gambut

This research was aimed to detect effectiveness of microorganism to increase growth of Artocarpus communis in peat soil. The peat soil came from countryside of Sei Toras, District Panai Tengah, and District Labuhanbatu, North Sumatra Province. Activators tested were Aspergillus sp., EM4, MOD-71, Supernasa and Puja-168. The research was done at Faculty of Agriculture, the University of North Sumatera from February to April 2009. Application of Aspergillus sp. Increased plant height (31.24%), stem diameter (2.84%) and leaf area (63%). Compared to control treatment, the application of Aspergillus sp. increased available P 49%, K 34%, and Ca 45%, however level of total N decreased by 17%. Keywords: Aspergillus sp., decomposer, nutrient availability, Effective Microorganism, bioactivator

Survey on sexual maturation on freshmen at the University of North Sumatera, Medan

A survey was conducted on freshmen in the year 1975. They consisted of 971 students: 705 boys and 266 girls. The boy’s age ranged from18 to 23 years while the girl's age ranged from 18 to 22 years. The survey was done with the retrospective method by filiing questionnaires. We found that puberty started earlier among the girls than the boys and that menarche started at the age of 14.75 years, which was later than found in other countries.

A survey on breast feeding practices at Dr Pirngadi Hospital Medan.

From August up to December 1978 a survey had been carried out on breast milk feeding in children of 0-2 years treated in the Departement of Child Health, Medical School, University of North Sumatera, Medon. The method applied was by filling questionnaires. The results were as follows: from 65 children ill vestigated, 28 (43.1%) drank breast milk, 14 (21,5%) breast milk + artificial milk, 20 (30.8%) artificial milk and 3 (4.6%) did not get any milk. The time of starting artificial milk as additional milk feeding was found highest (33.3%) at the age 3 -6 months. The older the child the less the percentage of breast milk.