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All Journal AGROEKOTEKNOLOGI Jurnal AGROSAINS dan TEKNOLOGI

Kemala Sari Lubis

Universitas Sumatera Utara

Author-ID : 3055699

Agriculture, Biological Sciences & Forestry

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Karakteristik Lahan Sawah yang Dialih Fungsi Menjadi Lahan Perkebunan di Desa Tangga Batu Kecamatan HatonduhanKabupaten Simalungun Azis Syahed; Kemala Sari Lubis; Razali Razali
Jurnal Agroekoteknologi Vol 3, No 4 (2015)
Publisher : Universitas Sumatera Utara

At Latest ten years, the paddy land at Tangga Batu area is use changed into plantation. This research was conducted to study characteristics of soil at some land uses ( paddy, rubber- cacao, and palm of 1,5 and 10 years old ).Soil sampling is conducted by using survey method. Soil samples are taken as soil sample disturbed and non distrubed at three (3) points in eachs land use randomly. The result showed that there is decreasing of total nitrogen at plantation and increasing of P- available at mixed farm (rubber – cacao). There are no changes of soil characteristics such us like potassiumexchange, pH, soil permeability, soil texture, and soil respirationat some land uses ( paddy, rubber- cacao, and palm of 1,5 and 10 years old ).Keywords: soil characteristics,agriculture land conversion.

Evaluasi Kadar Air Tanah, Bahan Organik dan Liat serta Kaitannya Terhadap Indeks Plastisitas Tanah Pada Beberapa Vegetasi di Kecamatan Pamatang Sidamanik Kabupaten Simalungun candra setiadi; Kemala Sari Lubis; Purba Marpaung
Jurnal Agroekoteknologi Vol 4, No 4 (2016)
Publisher : Universitas Sumatera Utara

Pengolahan tanah secara intensif tanpa memperhatikan faktor-faktor yang mempengaruhinya dapat menurunkan kualitas tanah. Indeks plastisitas tanah pada lahan yang dibudidayakan dengan tanaman berbeda membutuhkan pengolahan tanah yang berbeda. Penelitian ini dilakukan untuk mengkaji faktor-faktor dominan yang mempengaruhi indeks plastisitas tanah di lahan Kecamatan Pamatang Sidamanik pada budidaya yang berbeda. Penelitian dilakukan menggunakan metode survei. Sampel diambil secara acak dengan jumlah sampel yang diambil pada ordo tanah yakni 27 untuk lahan kopi, 12 untuk lahan teh dan 21 untuk lahan hortikultura. Hasil penelitian menunjukkan bahwa secara dominan indeks plastisitas tanah pada lahan yang ditanami kopi, teh dan hortikultura termasuk kriteria rendah serta bahan organik merupakan faktor paling besar yang mempengaruhi indeks plastisitas tanah dengan nilai pengaruh sebesar 54,949%.

Kajian Hubungan Kadar Liat, Bahan Organik dan Kandungan Air terhadap Indeks Plastisitas Tanah di Kecamatan Jorlang Hataran Kabupaten Simalungun Sander Manganju Silalahi; Kemala Sari Lubis; Hamidah Hanum
Jurnal Agroekoteknologi Vol 4, No 4 (2016)
Publisher : Universitas Sumatera Utara

Pengolahan tanah secara intensif tanpa memperhatikan faktor-faktor yang mempengaruhinya dapat menurunkan kualitas tanah. Penelitian ini bertujuan untuk mengkaji hubungan kadar liat, bahan organik serta kandungan air terhadap indeks plastisitas tanah di Kecamatan Jorlang Hataran Kabupaten Simalungun pada jenis tanah Andisol pada bulan Mei sampai dengan Nopember 2015. Data diolah dengan menggunakan analisis regresi berganda dan sederhana dengan faktor independent yaitu kadar liat, bahan organik, kandungan air dan faktor yang dipengaruhi yaitu indeks plastisitas. Hasil penelitian menunjukkan bahwa indeks plastisitas pada tanah Andisol berkisar antara 0,28% – 10,24%, sebagian besar dalam kondisi kurang plastis. Tidak terdapat hubungan regeresi linear berganda antara kadar liat, bahan organik dan kandungan air terhadap indeks plastisitas, namun pada regresi sederhana terdapat hubungan antara kadar liat dengan indeks plastisitas tanah. Kadar liat merupakan faktor yang paling mempengaruhi indeks plastisitas pada tanah Andisol dengan nilai koefisien korelasi (r) sebesar 0,476.

Populasi Bakteri Tanah pada Piringan Tanaman Kelapa Sawit Akibat Pemberian Pupuk NPK Komplit Netanya Panggabean; T. Sabrina; Kemala Sari Lubis
Jurnal Agroekoteknologi Vol 4, No 3 (2016)
Publisher : Universitas Sumatera Utara

Soil biota plays an important role several processes in soil. They are enchancing plant growth as inorganic fertilizer such as NPK complete fertilizer. This research was conducted to study population of some species of bacteria at Gajah Village, Sei Balai Subdistrict, Batubara District. The research was a survey by purposive sampling method that aimed to compare soil bacterial population (Azotobacter spp., Bacillus spp. and Lactobacillus spp.) in the oil palm’s weeded circle. The research was done by taking 60 soil samples in the oil palm’s weeded circle. The result showed that the population of bacteria Azotobacter spp. around the weeded circle of oil palm applied with the NPK complete differed with the oil palm’s weeded circle that has not been given a NPK complete fertilizer. The relationship between the occurrences of soil bacteria with the soil properties showed that the presence of Bacillus spp. affected the water soil content and the nitrogen total. Keywords: Azotobacter spp., Bacillus spp., Lactobacillus spp., NPK complete fertilizer

Effect of Some Ameliorants on Chemical Properties Of Toba Highland Peat and Growth of Rice (Oryza sativa L.) Berkat Julianto Banjarnahor; Sarifuddin Sarifuddin; Kemala Sari Lubis
Jurnal Agroekoteknologi Vol 6, No 1, Januari (2018)
Publisher : Universitas Sumatera Utara

ABSTRACT The aim of this study to know effect of some ameliorants by toba plateau peat’s chemical characteristic for growth and production Ciherang. The study was conducted at greenhouse of Faculty of Agriculture, University of Sumatera Utara and analysed at PT.Socfin Indonesia and Laboratories Research and Technology. This research used randomized block design non factorial with eight treatments there were G0 (control), G1 (volcanic ash 250 g / pot), G2 steel slag 50 g / pot), G3 (seawater 250 ml / pot), G4 (volcanic ash 250 g + steel slag 50 g / pot), G5 (volcanic ash 250 g + seawater 250 ml / pot), G6 (steel slag 50 g + seawater 250 ml / pot), G7 (volcanic ash 250 g + steel slag 50 g + sea water 250 ml / pot) with three replications. The results showed ameliorant steel slag 50 g increased the soil up to pH 4:35, combinations volcanic ash 250 g and the steel slag 50 g increased the electrical conductivity up to 0,194 mmhos/cm and combination of volcanic ash 250 g and the 50 g of steel slag increased rice growth there are toba highland peat 107,3 cm in height, 25 clumps in number of vegetatif and generatif tillers and reduce the percentage of empty grain up to 78.73%, %, and aplication combination ameliorant volcanic ash 250 g with 50 g of steel slag as well as sea water 250 ml increase the production of rice plants / pots and grain weight 1000 grain with the value of each 24.12 grams and 21.47 grams Top of Form Keywords: Highland Toba peat, Rice Ciherang variety, Seawater, Steel slag, Volcanic ash

Pengaruh Limbah Padat Pabrik Kertas Rokok Terhadap Beberapa Sifat Kimia Tanah Ultisol Tambunan A Melina Vika; Kemala Sari Lubis; M. M. B. Damanik
Jurnal Agroekoteknologi Vol 5, No 3 (2017)
Publisher : Universitas Sumatera Utara

Solid waste of cigarette paper factory does not contain hazard and toxic materials but contain CaCO3as a lime material. The research of was conducted to study effect of application of solid waste fromthe cigarette paper factory to improve soil properties at Ultisol Tambunan A. This research wasconducted at the Laboratory of Soil Physics, Agriculture Faculty and analytic laboratory of socfindocompany from May until June 2016. The research used non factorial completely randomized designconsist (CRD) of four (4) treatment solid waste (cigarette paper factory) and five (5) replications,there are: L0 (control), L1 (0,4 g), L2 (0,6 g), and L3 (0.8 g). The results showed that the applicationof solid waste from cigarette paper significantly increase soil pH, P-available, Ca-exchangeble butnot significantly increase K-exchangeable and organic carbon of Ultisol. Application of solid wastefrom cigarette paper significantly decrease Al-exchangeable and no significantly decrease Alsaturatedof Ultisol.Keyword : Solid waste of cigarette paper, Ultisol

Co-Authors Alida Lubis Ameilia Zuliyanti Siregar Andri Martilova Sebayang Azis Syahed Berkat Julianto Banjarnahor candra setiadi Christian Natanael Tarigan Erwita Pardosi Erwita Pardosi Fauzi Fauzi Firlana Firlana Hamidah Hanum Imam Bukhari Iman Saleh Batubara jamila Jamila Jamilah Jamilah M. M. B. Damanik Melina Vika MMB Damanik Netanya Panggabean Posma Marbun Purba Marpaung Razali Rian Asnul Maulana Riyanda Agustira Rodrik T Rodrik T Sander Manganju Silalahi Sarifudddin Sarifudddin Sarifuddin Sarifuddin Supriadi Supriadi T Sabrina Tomy Ardiansyah Tulus Tulus

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