Purba Marpaung
Universitas Sumatera Utara

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KESESUAIAN LAHAN UNTUK TANAMAN JERUK (Citrus sp.) DAN KOPI ARABIKA (Coffea arabica) DI KECAMATAN SIEMPAT RUBE KABUPATEN PAKPAK BHARAT Cibro, Gilbert Fernando; Marpaung, Purba; Mukhlis, Mukhlis
AGROEKOTEKNOLOGI Vol 1, No 1 (2012)
Publisher : Program studi Agroekoteknologi, Fakultas Pertanian, Universitas Sumatera Utara-Medan

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ABSTRACT The suitability of the land for the plant orange and Arabica coffee (Coffea arabica) in district of Siempat Rube, Pakpak Bharat Regency. A survey of the suitability of the land for the plant orange and Arabica coffee is done in district of Siempat Rube Pakpak Bharat Regency. This study aims to evaluate the suitability of land for the development of citrus fruit and Arabica coffee plant in the Regency of North Sumatra with the altitude of the place is at 800-1400 above sea level. This research was carried out in June 2011 to December 2012. Survey research conducted by taking samples of soil based on the map of the land system in district of Siempat Rube, each land system was taken as many as 10 soil samples taken in a zig-zag, where 10 soil samples and then analyzed the lab and evaluation methods of land made by the method of the limit which refers to the magnitude of the rate limiting factor. The parameters observed in field is soil texture, soil drainage, soil depth, rough material, the dominant vegetation, plant management, soil conservation efforts, the dangers of Flood/inundation, surface rocks and outcrops and the parameters analyzed include the physical properties of dilaboratorium (textures) and chemical properties: cation exchange capacity (CEC) of soils, soil pH, Base Saturation, and the C-organic. The evaluation of land in sub-district siempat rube district pakpak bharat, conformity land potentially for plants orange on class S3-oarc of 334,229 ha,   S2-rceh of 6430,282 ha, S2-rc of 1415,285 ha and S3-rc of 3796,192 ha. Conformity potential land to coffee plant arabica obtained class S3-waoarc of 334,229 ha, S3-wa of 7845,587 ha and S3-warc of 2594,218 ha. Keywords: Evaluation of lands suitability, citrus, arabica coffee.  ABSTRAK Kesesuaian lahan untuk tanaman jeruk (citrus sp.) dan kopi Arabika (Coffea arabica) di Kecamatan Siempat Rube Kabupaten Pakpak Bharat. Survei kesesuaian lahan untuk tanaman jeruk dan kopi arabika dilakukan di Kecamatan Siempat Rube Kabupaten Pakpak Bharat. Penelitian ini bertujuan untuk mengevaluasi kesesuaian lahan untuk pengembangan tanaman jeruk dan tanaman kopi arabika di Kabupaten Pakpak Bharat dengan ketinggian tempat berada pada 800-1400 di atas permukaan laut. Penelitian ini dilaksanakan pada bulan Juni 2011 sampai dengan bulan Desember 2012. Penelitian dilakukan dengan mengambil contoh tanah berdasarkan peta land system di Kecamatan Siempat Rube, setiap land system diambil sebanyak 10 sampel tanah secara zig-zag kemudian di analisis laboratorium dan metode evaluasi lahan dilakukan dengan metode limit yakni mengacu pada besarnya tingkat faktor pembatas. Parameter yang diamati dilapangan adalah tekstur tanah, drainase tanah, bahan kasar, kedalaman tanah,vegetasi dominan, pengelolaan tanaman, upaya konservasi tanah, bahaya banjir/genangan, batuan permukaan dan singkapan batuan dan parameter yang dianalisis dilaboratorium meliputi sifat fisik (tekstur)  dan  sifat kimia: Kapasitas Tukar Kation (KTK) tanah, Kejenuhan Basa, pH tanah,dan C-organik. Hasil evaluasi lahan di Kecamatan Siempat Rube Kabupaten Pakpak Bharat, kesesuaian lahan secara potensial untuk tanaman jeruk pada kelas S3-oarc seluas 334,229 ha, S2-rceh seluas 6430,282 ha, S2-rc seluas 1415,285 ha dan S3-rc seluas 3796,192 ha. Kesesuaian lahan potensial untuk tanaman kopi arabika diperoleh kelas S3-waoarc seluas 334,229 ha, S3-wa seluas 7845,587 ha dan     S3-warc seluas 2594,218 ha. Kata kunci : evaluasi kesesuaian lahan, jeruk, kopi arabika.  
PENGARUH VARIETAS DAN BAHAN ORGANIK YANG BERBEDA TERHADAP BOBOT 1000 BUTIR DAN BIOMASSA PADI SAWAH IP 400 PADA MUSIM TANAM I Siregar, Daniel; Marbun, Posma; Marpaung, Purba
AGROEKOTEKNOLOGI Vol 1, No 4 (2013)
Publisher : Program studi Agroekoteknologi, Fakultas Pertanian, Universitas Sumatera Utara-Medan

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The objective of this study is to determine the effect of rice varieties and different organic matter ofrice fields in one growing season to the 1000 grain weight and paddy rice biomass IP 400. Theresearch was conducted at paddy fields located at UPT Main Rice Seed Big of Pasar MiringTanjung Morawa Subdistrict, Deli Serdang District. This study uses a randomized block design(RBD) with two factors, namely rice varieties Inpari I and Ciherang and organic matter. Eachtreatment consisted of non-organic material, composted straw, cow manure.The results showed thatthe use of varieties of very significant effect on the dry weight of 1000 grain rice planting season IP400 I, and the very significant effect on rice biomass IP 400. Treatment of organic material verysignificant effect on the dry weight of 1000 grain rice IP 400 in the first growing season, and a verysignificant effect terhdap rice biomass IP 400. Interaction between rice varieties and application oforganic manures no significant effect on the dry weight of 1000 grains and rice biomasaa IP 400.Keywords: IP 400, 1000 grain weight, biomass rice
EVALUASI SIFAT-SIFAT KIMIA TANAH YANG DIAPLIKASI LIMBAH CAIR PABRIK KELAPA SAWIT DI PT SMART KEBUN PADANG HALABAN KABUPATEN LABUHAN BATU UTARA Torang, Mhd Arian; Rauf, Abdul; Marpaung, Purba
AGROEKOTEKNOLOGI Vol 2, No 1 (2013)
Publisher : Program studi Agroekoteknologi, Fakultas Pertanian, Universitas Sumatera Utara-Medan

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Liquid Waste of Oil Palm Factory contains nutrients which are required by plants and it can beapplied to the estate crops. This research evaluate the palm oil factory soil chemical applied byliquid waste of oil palm factory at PT Smart Padang Halaban Plantation at Labuhan Batu UtaraDistrict. Soil sampel by using soil sampling method at three different location of research namelycontrol, sela and rorak aplications, six deepness level and three times replicates. Parameters thatmeasured are pH, C, N, C/N and absorption P of plant. Statistical test that used is determined flatvalue and criteria characteristic of soil. The result of research showed they increasing ofcharacteristic chemistry which are apllicated by liquid waste of oil palm factor. Parameters whichexperience increasing is pH, C, N, C/N and absorption P of plant.Keywords : evaluation, characteristics chemistry of soil, liquid waste of oil palm
IDENTIFIKASI HORISON ARGILIK DENGAN METODE IRISAN TIPIS PADA ULTISOL DI ARBORETUM USU KWALA BEKALA Tarigan, Christian Natanael; Marpaung, Purba; Lubis, Kemala Sari
AGROEKOTEKNOLOGI Vol 2, No 2 (2014)
Publisher : Program studi Agroekoteknologi, Fakultas Pertanian, Universitas Sumatera Utara-Medan

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Identification argillic for reddish brown of podzolic soil (Ultisol) was conducted at Arboretum USUKwala Bekala, Deli Serdang Regency (50 meters above sea level). The research was conducted InJanuary - April 2013 by using thin section method to identification clay skin at each horizons layerby using a microscope petrothin. The results showed that no clay skin at horizons of ultisol fromArboretum USU Kwala Bekala Pancur Batu District , Deli Serdang Regency . it’s not true that bthorizon of ultisols is argillic. Land of arboretum USU Kwala Bekala more suitable as inceptisolsorder with cambic horizonKeywords: thin section, ultisol, argillic
PENGARUH KETINGGIAN TEMPAT DAN KEMIRINGAN LERENG TERHADAP PRODUKSI KARET (Hevea brasiliensis Muell. Arg.) DI KEBUN HAPESONG PTPN III TAPANULI SELATAN Andrian, Andrian; Supriadi, Supriadi; Marpaung, Purba
AGROEKOTEKNOLOGI Vol 2, No 3 (2014)
Publisher : Program studi Agroekoteknologi, Fakultas Pertanian, Universitas Sumatera Utara-Medan

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The elevation and slope effect significantly to growth and rubber (Hevea brasiliensis Muell. Arg.)production . This research was done in Hapesong Farm, Batang Toru sub-district in July – August2013. The aim of this research is to know the effect of elevation and slope on rubber production inHapesong Farm. The sampling used free survey method and Geographic Informatin Systems (GIS).The variables are elevation and slope, and then analysed by regretion method.The result showedthat elevation, slope is significant to decrease the rubber production, but jointly elevation and slopedo not. Elevation of the best places in the study area is 84.5 meters above sea level. The land on theelevation 294.5 meters above sea level, preferably the rubber is not planted anymore.Keyword: elevation, slope, rubber
Klasifikasi Inceptisol Pada Ketinggian Tempat yang Berbeda di Kecamatan Lintong Nihuta Kabupaten Hasundutan Ketaren, Samuel Evans; Marbun, Posma; Marpaung, Purba
AGROEKOTEKNOLOGI Vol 2, No 4 (2014)
Publisher : Program studi Agroekoteknologi, Fakultas Pertanian, Universitas Sumatera Utara-Medan

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This research aims to classify inceptisol soil at sub-district of Lintong Ni Huta, Regency ofHumbang Hasudutan on the various elevation. On the elevation of 1200-1300, 1300-1400, 1400-1500, and >1500m on above sea level. The sampling of soil was took at 3 soil profile holes on FieldMap unit and Key to Soil Taxonomy 2010 . Of the result of this research, it obtain the classification ofprofile 1, 2, and 3 with Ordo, Sub Ordo, and Great Groupin the same is Inceptisol, Udept,and Dystrudept. OnSub Group category the classification of profile 1 is Psammentic Dystrudept. On Sub Group category theclassification of profile 2 is Pachic Dystrudept. On Sub Group category the classification of profile 3 isFluventic Dystrudept.Key words : Various elevation, Inceptisol
Perubahan Sifat Kimia Inceptisol Melalui Aplikasi Bahan Humat Ekstrak Gambut Dengan Inkubasi Dua Minggu Swanda, Jeni; Hanum, Hamidah; Marpaung, Purba
AGROEKOTEKNOLOGI Vol 3, No 1 (2015)
Publisher : Program studi Agroekoteknologi, Fakultas Pertanian, Universitas Sumatera Utara-Medan

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The objective of this research was study of several dosages humic material from extract peat inimproving Inceptisol soil chemical characteristics .The soil sample using Inceptisol and humicmaterial from extract peat. It is conducted in Faculty of Agriculture greenhouses, University ofNorth Sumatra, using non-factorial randomized block design,the treatment of humic materialconsisted of 6 levels and 3 replications so there are 18 experimental units, namely : The treatment 0,200, 400, 600, 800 and 1000 ppm humic material. The measured parameters were pH (H2O), Corganic,P-available,Al-exchange, cation exchange capacity (CEC) and Al saturation. The result ofthis research showed that humic material application significantly affected in increasing pH and Corganik,but not significant effect on P-available,Al-exchange, CEC and Al saturation. The value ofsoil pH increasing from very acid to acid on dosages humic material 400 until 1000 ppm and thehighest increase of soil pH is 4.74 on dosages 1000 ppm. Humic material couldn’t improve otherssoil chemical characteristics. The value of P-available, C-organic, Al saturation is very low, andCEC is low.Key words: Inceptisols, humic material, pH, C-organik, P-avalaible,CEC and Al-exchange
Klasifikasi Tanah Di Lereng Selatan Gunung Burni Telong Kecamatan Bukit Kabupaten Bener Meriah Provinsi Aceh Putri, Thasniema; Marpaung, Purba; Razali, Razali
AGROEKOTEKNOLOGI Vol 3, No 1 (2015)
Publisher : Program studi Agroekoteknologi, Fakultas Pertanian, Universitas Sumatera Utara-Medan

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The research at south slope of mount Burni Telong is aimed to soil classification with theclassification system of Soil Taxonomy, 2014 into sub grup category which was conducted inFebruary – September 2014. Two selected pedons were observed at middle slop (Va.1.6.1t) andbottom slope (Va.1.4.1t). Soil samples were taken from each horizon for analysis bulk density, pH(H2O), pH (KCl), pH (NaF), Al, cation exchange capacity, base saturation, qrganic carbon,phosfat retention in Research and Technology Laboratory, Agricultural Faculty of North SumateraUniversity, Medan and analysis of soil texture, Al-oxalate extracted (Alo), Si-oxalate extracted(Sio), and Fe-oxalate extracted (Feo) in Soil Laboratory, Soil Research Institute, Bogor.The resultof this research is the classification in the middle slop soil (Va.1.6.1t) is Humic PsammenticDystrudepts, and on the bottom slope soil (Va.1.4.1t) is Typic Hapludands.Keywords: Mount Burni Telong, Soil Classification, Soil Taxonomy dd
Penentuan Jenis Mineral Liat Alofan Tanah Andisol di Desa Dolat Rakyat Kecamatan Tiga Panah Kabupaten Karo Simamora, Jupri; Marpaung, Purba; Lubis, Alida
AGROEKOTEKNOLOGI Vol 3, No 3 (2015)
Publisher : Program studi Agroekoteknologi, Fakultas Pertanian, Universitas Sumatera Utara-Medan

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The aim of the research was to determinate type of Allophane minerals by means of Thermogram and to know 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.Key Word : Allophane, Andisol, Organic Matter
Kajian Selektivitas Erosi Pada Lahan Budidaya Padi Gogo Di Desa Lau Damak Kecamatan Bahorok Kabupaten Langkat Tamika, Rika; Rauf, Abdul; Marpaung, Purba
AGROEKOTEKNOLOGI Vol 3, No 3 (2015)
Publisher : Program studi Agroekoteknologi, Fakultas Pertanian, Universitas Sumatera Utara-Medan

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Gogo rice as one of many commodities developed on sloping topography, thus potentially increasing run off a water and soil erosion that will transport nutrients to the other place. The aim of the research was to know the Erosion Selectivity on Land Cultivation of Gogo Rice in Countryside of Lau Damak Distric of Bahorok Sub-Province Langkat. The research was conducted from September until November 2014 through 2 stages of activity, it was fieldwork and laboratory activities. The Stages of fieldwork has done in village at Lau Damak District of Bahorok Langkat on 15% slope. The results of field activities was analysis in agriculture faculty laboratory,University of North Sumatra, Medan. The reseach use a t-test to differentiate the nutrients at upper, center, and bottom of the slope. The selectivity of erosion can be seen from the changes in the levels of clay and organic Carbon in the upper, middle and lower slopes. Selectivity erosion can also be seen from the changes, total-N, available P, pH, K, CEC, and soil texture on the part of the slope.The results showed that the Organic Carbon and Total-Nitrogen were significantly differenton the slopes position.Key words : Soil Erosion, selectivity erosion, gogo rice