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PENGGUNAAN RUMPUT LAUT LAUT (Sargassum polycystum) SEBAGAI BAHAN PUPUK CAIR DAN PENGARUHNYA TERHADAP KANDUNGAN N,P,K,Ca,Mg TANAH ULTISOL DANPRODUKSI SAWI ( Brassica juncea L. ) ORGANIK Ricky Ricky Ambarita; Alida Lubis; Hardy Guchi,
Jurnal Agroekoteknologi Vol 2, No 2 (2014)
Publisher : Universitas Sumatera Utara

This study aims to find out the use of seaweed ( Sargassum polycystum ) as a liquidfertilizer and its effect on N , P , K , Ca , Mg Ultisol and mustard (Brassica juncea L. )growth organically. The study was carried out in the Screen House and Laboratory ofChemical and Soil Fertility , and Central Laboratory , Faculty of Agriculture ,University of North Sumatra , Medan since January until March 2012. This researchused Randomized Block Design( RBD ) non factorial of nine treatments with tworeplication so there are two eighteen experimental unit . The treatment consists of P0(control) , P1 (application of liquid seaweed fertilizer A-type every two days) , P2(application of liquid seaweed fertilizer A-type every three days ), P3(application ofliquid seaweed fertilizer A-type every four days), P4 (application of liquid seaweedfertilizer A- type every five days), P5 (application of liquid seaweed fertilizer B-typeevery two days), P6 (aplication of liquid seaweed fertilizer B-type every three days ), P7( application of liquid seaweed fertilizer B-type every four days ) , P8 (application ofliquid seaweed fertilizer B-type every five days ). A-type of fertilizer use EM-4 20 ccand B-type use EM-4 40 cc. The results showed that application of liquid seaweedfertilizer did not differ significantly affected soil total P, available P, soil total K , Kexchangeable,Ca-exchangeable, Mg- exchangeable and plant dry weight. Butsignificantly different on the soil N, plant height, leaf area, number of Leaf, chlorophyllcontent, plant mass weight, plant fresh weight for market. The highest weight of plantmasss achieve on the treatment P4 that is weighing 149.1 g.Keywords: polyscystum sargassum, seaweed fertilizer, mustard (Brassica juncea L)

POTENSI BERBAGAI TANAMAN SEBAGAI INANG INOKULUM MIKORIZA ARBUSKULAR DAN EFEKNYA TERHADAP PERTUMBUHAN TANAMAN JAGUNG DAN KEDELAI DI TANAH ULTISOL Doli Saputra Hasibuan; T. Sabrina; Alida Lubis
Jurnal Agroekoteknologi Vol 2, No 2 (2014)
Publisher : Universitas Sumatera Utara

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

PEMANFAATAN DUA JENIS KOMPOS GANGGANG COKLAT (Sargassum polycystum) DALAM MENINGKATKAN KESUBURAN TANAH ULTISOL SERTA PRODUKSI TANAMAN SAWI (Brassica juncea L.) Topan Radika Pranata Siregar; Alida Lubis; Supriadi Supriadi
Jurnal Agroekoteknologi Vol 2, No 3 (2014)
Publisher : Universitas Sumatera Utara

This reseach aimed to determines differences ability between two types of the brown algaecompost increase fertility of Ultisol and mustard production. This research was conducted inCompos Centre, Gauze House, Laboratory of Chemistry And Soil Fertility ,Laboratory of Researchand Technology Agriculture Faculty, University of North Sumatera, Medan in March-October2013. The method used non-factorial randomized block design consisting of 11 treatments with 3replications. R0 (control), R1, R2, R3, R4, and R5 with application of 50 g, 100 g, 150 g, 200 g, and250 g brown algae compost respectively, R6, R7, R8, R9, dan R10 with application of 50 g, 100 g,150 g, 200 g, and 250 g brown algae add chicken dirt compost respectively.The results showed thatapplication of two types compost able to increase the pH, C-organic, N-total, K-exchange in thesoil as well as increase the plant height, plant fresh weight, plant dry weight and root dry weight. Atparameters of soil pH, the K-exchange soil, application of brown algae compost significantlydifferent with brown algae added chicke dirt compost. The best dosage of brown algae add chickendirt compost 150 g /polybag for the K-exchange soil and soil pH.Keywords : The brown algae compost, chicken dirt, mustard.

Analisis Pengaruh Tekstur Dan C-Organik Tanah Terhadap Produksi Tanaman Ubi Kayu (Manihot esculenta Crantz) Di Kecamatan Pegajahan Kabupaten Serdang Bedagai Jayagust K.A Junior Sinaga,; Supriadi Supriadi; Alida Lubis
Jurnal Agroekoteknologi Vol 2, No 4 (2014)
Publisher : Universitas Sumatera Utara

The Analysis of Soil Texture and C-Organic Influence for Cassava Production(Manihot esculenta Crantz.) at Sub District Pegajahan, Serdang regency. The research purpose is todetermine the effect of soil texture and C-organic influence of cassava production at Sub DistricPegajahan. The research was conducted on June-July 2013. Sample was taken have a lot of 50farmers by using simple random sampling methode. The parameters was being analiysed were soiltexture and C-organic. Then appraisal data processed with regression method. Final research resultsshown that C-organic effect toward cassava production, sand, silt and clay has no significant effecttoward cassava production. The optimal C-organic for cassava production is 0,203 %, while themean C-organic more than from the optimal C-organic at Sub Distric Pegajahan.Keywords : Soil Texture, C-Organic, Cassava Production

Aplikasi Kompos Ganggang Cokelat (Sargassum polycystum) Diperkaya Pupuk N, P, K Terhadap Inseptisol dan Jagung Hendra Jawa Sertua; Alida Lubis; Posma Marbun
Jurnal Agroekoteknologi Vol 2, No 4 (2014)
Publisher : Universitas Sumatera Utara

This research aimed to determine the effect of brown algae compost (Sargassum polycystum)enriched with various of dosage N, P and K fertilizer against inceptisol chemical properties andmaize. This research was conducted in June – October 2013 using non-factorial randomized blockdesign, with 7 treatment and 4 replication. That is P0 (not enriched brown algae compost), P1, P2,P3, P4, P5, and P6 (compost enriched urea 2g and 4g dosage level, SP36 2g and 4g dosage level,KCl 0,5g and 1g dosage level). Applied before the vegetative period (when beginning to cultivatethe land) and before the generative period. Parameters measured d canopy, and cob with cornhuskweight. The results showed that brown algae enriched compost significantly affect the pH (H2O),K-exchange soil, plant height and cob with cornhusk. The best dosage is P5 (brown algae compostenriched with urea 4g, SP36 2g, and KCl 0,5g application on early vegetatif and urea 2g, SP36 2g,dan KCl 1g application at the end of vegetative period) against cornhusk cob weight and dry weightof maize plant canopy.Keywords : Brown Algae Compost, N, P dan K Fertilizer, Inceptisol, Maize

Pendugaan Erosi Aktual Berdasarkan Metode USLE Melalui Pendekatan Vegetasi, Kemiringan Lereng dan Erodibilitas di Hulu Sub DAS Padang Imam Bukhari; Kemala Sari Lubis; Alida Lubis
Jurnal Agroekoteknologi Vol 3, No 1 (2015)
Publisher : Universitas Sumatera Utara

Erosion strongly influenced by vegetation, slope and erodibility. USLE method used to predictactual erosion. Vegetation factor, slope and erodibility used to examine the relationship of the actualerosion and analyzed with multivariate. Soil sampling in the upstream Sub DAS Padang at Rayadistrict, Simalungun based on vegetation, slope and erodibility with a sample size of the 33 samplepoints. The results showed that the highest erosion at 7.177,84 tons.ha-1.year-1 on the non-vegetationwith criteria levels classified as very severe erosion hazard and lowest erosion of 24,30 tons.ha-1.year-1 on the forest vegetation protected by the criteria of erosion potential as very mild.Keywords : Soil erosion, USLE method, DAS Padang

Pemberian Ekstrak Ganggang Cokelat (Sargassum polycystum) dan Bradyrhizobium japonicum untuk Meningkatkan Unsur Hara Nitrogen dan Produksi Tanaman Kedelai Ryrien Indriyati; Alida Lubis; Jamilah Jamilah
Jurnal Agroekoteknologi Vol 3, No 2 (2015)
Publisher : Universitas Sumatera Utara

Tujuan penelitian ini adalah untuk mengetahui pengaruh pemberian ekstrak ganggang cokelat dan Bradyrhizobium japonicum serta interaksinya dalam meningkatkan hara nitrogen dan produksi tanaman kedelai. Penelitian dilaksanakan di Rumah Kasa dan Laboratorium Biologi Tanah Fakultas Pertanian USU pada Juni-Oktober 2014, menggunakan Rancangan Acak Kelompok (RAK) faktorial, dengan 2 faktor dan 3 blok. Faktor pertama adalah konsentrasi ekstrak ganggang cokelat yang terdiri dari 4 perlakuan (0, 10, 20 dan 30 % / polybag) dan faktor kedua adalah Bradyrhizobium japonicum yang terdiri dari 2 perlakuan (tanpa dan dengan Bradyrhizobium japonicum). Hasil penelitian menunjukkan bahwa pemberian ekstrak ganggang cokelat berpengaruh nyata meningkatkan jumlah dan bobot bintil akar, berat kering tajuk, bobot biji, dan serapan N tanaman, namun tidak berpengaruh nyata meningkatkan N total tanah. Pemberian Bradyrhizobium japonicum berpengaruh nyata meningkatkan jumlah dan bobot bintil akar dan berat kering tajuk, namun tidak berpengaruh nyata meningkatkan N total tanah, serapan N tanaman dan berat biji. Hasil terbaik diperoleh pada kombinasi konsentrasi ekstrak ganggang cokelat 20%.Kata kunci : ekstrak ganggang cokelat, Bradyrhizobium japonicum, nitrogen, kedelai

Penentuan Jenis Mineral Liat Alofan Tanah Andisol di Desa Dolat Rakyat Kecamatan Tiga Panah Kabupaten Karo Jupri Simamora; Purba Marpaung; Alida Lubis
Jurnal Agroekoteknologi Vol 3, No 3 (2015)
Publisher : Universitas Sumatera Utara

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

Dampak Ketebalan Abu Vulkanik Erupsi Gunung Sinabung Terhadap Sifat Biologi Tanah Di Kecamatan Naman Teran Kabupaten Karo Beatrix I. L. J. Sinaga; Mariani Sembiring; Alida Lubis
Jurnal Agroekoteknologi Vol 3, No 3 (2015)
Publisher : Universitas Sumatera Utara

Penelitian ini dilakukan untuk mengetahui dampak ketebalan abu vulkanik pada erupsi Gunung Sinabung terhadap sifat biologi tanah di Kecamatan Naman Teran, Kabupaten Karo.Penelitian dilaksanakan di Laboratorium Biologi Tanah Fakultas Pertanian, Universitas Sumatera Utara, Medan dan di Balai Pengkajian Tanaman Pertanian (BPTP), Medan pada bulan Mei-September 2014.Penelitian ini dilakukan dengan melakukan pengamatan berdasarkan dengan ketebalan abu yang ada di lapangan dengan pengambilan sampel tanah diambil di daerah kecamatan Naman Teran, Kabupaten Karo dan dilakukan sebanyak 2 kali yaitu pada bulan April 2014 dan Juli 2014 dengan pengambilan sampel berdasarkan ketebalan abu yang tidak terkena A0 (tanpa), A1 (≤2cm), A2 (2-8 cm) dan A3 (>8cm).Adapun parameter yang diamati adalah pH tanah dan pengukuran aktivitas mikroorganisme tanah (respirasi).Hasil penelitian menunjukkan bahwa pH tanah dan pengukuran aktivitas mikroorganisme tanah (respirasi) bahwa semakin tebal abu yang menutupi permukaan tanah maka nilai pH dan respirasinya akan menurun.Kata kunci : abu vulkanik, ketebalan abu, sifat biologi tanah.

Hubungan Ketinggian Tempat dan C-organik Tanah Dengan Infeksi FAM Pada Perakaran Tanaman Kopi (Coffea Sp) di Kabupaten Dairi M. Ihsan Al Harista Sinaga; Hardy Guchi; Alida Lubis
Jurnal Agroekoteknologi Vol 3, No 4 (2015)
Publisher : Universitas Sumatera Utara

Research in Dairi aims to determine the relationship between altitude and soil organic carbon content of the ability FAM infection through stages of field sampling and direct observation in the laboratory , conducted from December 2013 - January 2014. The object is the roots of coffee plants , given the pre- observation treatment by 10% KOH soaking , HCl 2 % soaking and in a solution of trypan blue soaking . Then do the calculation ability of mycorrhizal infection by comparing the number of infected root surface and the total of roots surface were observed . The results showed that the degree of mycorrhizal infection on the roots of coffee plants positively influenced by altitude and soil organic Carbon content.Keywords: Mycorrhizae, Coffee Plant, Altitude, Organic Carbon

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