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Study of Coefficient of Seepage Irrigation in Tertiary Canals at Village of Kuala Simeme Namorambe District Deli Serdang Darwana Darwana; Sumono Sumono; Nazif Ichwan
Jurnal Rekayasa Pangan dan Pertanian Vol 3, No 2 (2015): Jurnal Rekayasa Pangan dan Pertanian
Publisher : Universitas Sumatera Utara

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Land water distribution system in the villageof Kuala Simeme is done through tertiary ground channel. Water can loss through evapotranspiration, percolation, and seepage that may affect of the efficiency of water delivery.Of the three factors, the determination of the value of water loss throught seepage in the field was more difficult. This study was aimed to assess the seepage coefficient at two tertiary irrigation canal in the village of Kuala Simeme District of Namorambe, Deli Serdang.The results showed that seepage coefficient in the right edge of the first canal was 3.775,68 mm/day, at the left edge was 10.368,8 mm/day; at the right edge of second canal was 34.368,51 mm/day and at the left edge was 9.562,13 mm/day. Efficiency on first that canal and second canal were 91,02% and 81,73% respectively. Keyword: Tertiary Canal, Efficiency Distribution of water and seepage coefficient

Determination of Value of Evapotraspiration and Plant Coefficient of IR64 Rice Variety (Oryza sativa L.) in the Faculty of Agriculture, University of Sumatera Utara Green House Yunidar Nasution; Sumono Sumono; Ainun Rohana
Jurnal Rekayasa Pangan dan Pertanian Vol 3, No 3 (2015): Jurnal Rekayasa Pangan dan Pertanian
Publisher : Universitas Sumatera Utara

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The water requirement of rice crop is compose of saturation, percolation, flooding and evapotranspiration. The amount of evapotranspiration can be determined based on the value of potential evaporation and the rice crop coefficient values for each period of growth. This study was aimed to assess the value of evapotranspiration and coefficient of IR64 iice (var. Oryza sativa L.) in green house with inundation of 5 cm and 10 cm high. The results showed that the value of the coefficient of the rice plant at 5 cm water level was 0.96 in early growth phase, 0.88 in the phase of active growth, 0.84 in reproductive growth phase, and 0.56 in the ripening phase, while for the water level of 10 cm was 1.03 in the early growth phase, 1.10 in the active growth phase, 1.03 in reproductive growth phase, and 0.71 in the ripening phase. Average of rice productivity was 746.7 grains/plots for the water level 5 cm, and at 10 cm was 723.1 grains/plot. Inundation height of 5 cm could save water by 50% compared to 10 cm high inundation. Keywords: Evapotranspiration, green house, plant coefficient, rice

Study of Soil Infiltration in Various Fields in Durin Tonggal Village Experimental Plots Pancur Batu Subdistrict Deli Serdang District Andrean Hendratmo Hutabarat; Sumono Sumono; Nazif Ichwan
Jurnal Rekayasa Pangan dan Pertanian Vol 3, No 4 (2015): Jurnal Rekayasa Pangan dan Pertanian
Publisher : Universitas Sumatera Utara

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Infiltration is one of very important element in the hydrological cycle as it relates to the intensity of rainfall that will affect the water storage in the soil and erosion. This study was aimed to determine the rate of infiltration in the fields of rubber, cassava, maize and cacao in subdistrict Pancur Batu using Philips equation model. The results showed that in the field of rubber with argillaceous sand texture the infiltration rate was fp = 0.460006 + 2,24274t-0,5 cm / min, in the cassava fields with sandy loam texture the infiltration rate was fp = 0.018388 + 2 , 40156t-0,5 cm / min, in maize field with sandy clay loam soil texture the infiltration rate was fp = 0.08988 + 1,95682t-0,5 cm / min, and cacao field with sandy clay loam texture the infiltration rate was fp = 0.05513 + 0,44371t -0,5cm / min. Keywords: Cacao Field, Cassava Field, Infiltration rate, Maize Field, Rubber Field

The Study of Rice Production Potential on Sungai Bunut Irrigation Fields in Rawang Panca Arga District Asahan Regency Noviyana Tanjung; Sumono Sumono; Lukman Adlin Harahap
Jurnal Rekayasa Pangan dan Pertanian Vol 3, No 4 (2015): Jurnal Rekayasa Pangan dan Pertanian
Publisher : Universitas Sumatera Utara

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Rawang Panca Arga District as the largest of centra rice production in Asahan Regency, must be studied its irrigation system of rice field to hold out and increase production. The purpose of this research was to study the rice production potential in Sungai Bunut irrigation fields in Rawang Panca Arga district Asahan regency in achieving the maximum level of rice production based on sun radiation level, time to grow rice, and rice variety. This research also studied the ratio between irrigation field and crops field, the ratio between technical irrigation and pre technical and conventional irrigation and reliability of existing irrigation networks. In the year of 2009-2013, the results indicated that the irrigation network reliability was not good enough. The average ratio between technical irrigation and pre technical and conventional irrigation was 0,35, the average ratio between irrigation field and crops field was 1,9 and the rice production target was 56,75%. keywords: rice, production target, production potential, irrigation network.

KAJIAN SIFAT FISIKA DAN KIMIA TANAH ULTISOL PADA LAHAN KELAPA SAWIT TAHUN TANAM 2003DENGAN BEBERAPA JENIS VEGETASI YANG TUMBUH DI KEBUN PTP. NUSANTARA IITANJUNG GARBUS (Study of Physical and Chemical Soil Characteritics in Oil Palm Plantation on Plant Yea Pretty Luci LR; Sumono Sumono; Riswanti Sigalinggling
Jurnal Rekayasa Pangan dan Pertanian Vol 7, No 2 (2019): Jurnal Rekayasa Pangan dan Pertanian
Publisher : Universitas Sumatera Utara

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ABSTRACT Physical and chemical soil characteritics are important factors for the growth of oil palm. This research was aimed to study physical and chemical soil characteritics of the oil palm with vegetations of Pueraria javanica, grass, and no vegetation in TanjungGarbus PTP Nusantara II. The observed parameters were soil texture, porosity, water content of field capasity, soil permeability, total Nitrogen, available Phospate, and land Potassium exchange.The results showed that the soil type was ultisol, with sandy loam texture and pH of 5.57-5.98 (acid). The soil vegetation had porosity of 42 % at a depth of 5 cm and 40-41 % at a depth of 25 cm. The water content of field capacity was ranged from 23.2-27 % at a depth of 5 cm and 22.6-26.1 % at a depth of 25 cm. Permeability was ranged from 4.6-5.95 cm/h. Total N was 0.10 %. P available was ranged from 1.49-17.09 ppm. K exchange of land was ranged from 0.24-0.36 me/100g. The soil with no vegetation had porosity of 41 % at a depth of 5 cm and 39 % at a depth of 25 cm. The water content of field capacity was 22.3 % at a depth of 5 cm and 22.1 % at a depth of 25 cm. Permeability was 1.39 cm/h. Total N was 0.08 %. P available was 2.26 ppm. K exchange of land was 0.61 me/100g. Keywords: Soil physical and chemical, vegetation, oil palm plantation. ABSTRAK Sifat fisika dan kimia tanah merupakan faktor penting bagi pertumbuhan kelapa sawit. Penelitian ini bertujuan untuk mengkaji sifat fisika dan kimia tanah ultisolpada lahan kelapa sawit dengan vegetasi kacang-kacangan (Pueraria javanica), rumput dan tanpa vegetasi di Kebun PTP. Nusantara II Tanjung Garbus. Parameter yang diamati meliputi tekstur tanah, porositas, kadar air kapasitas lapang, permeabialitas tanah, N-total, P tersedia dan K tukar tanah.Hasil penelitian menunjukkan jenis tanah di daerah penelitian adalah ultisol bertekstur lempung berpasir dan pH 5,57-5,98 (masam). Tanah dengan vegetasi mempunyai porositas berkisar 42 % pada kedalaman 5 cm dan 40-41 % pada kedalaman 25 cm, kadar air kapasitas lapang 23,2-27 % pada kedalaman 5 cm dan 22,6-26,1 pada kedalaman 25 cm, permebilitas berkisar 4,6-5,95 cm/jam, N-total 0,10 %, P tersedia 13,49-17,09 ppm, K tukar tanah 0,24-0,36 me/100g. Tanah tanpa vegetasi mempunyai porositas berkisar 41 % pada kedalaman 5 cm dan 39 % pada kedalaman 25 cm, kadar air kapasitas lapang 22,3 % pada kedalaman 5 cm dan 22,1 % pada kedalaman 25 cm, permebialitas berkisar 1,39 cm/jam, N-total 0,08 %, P tersedia 20,26 ppm, K tukar tanah 0,61 me/100g. Kata Kunci: Fisika dan kimia tanah, vegetasi, kebun kelapa sawit

KAJIAN SIFAT FISIKA TANAH PADA AREAL TANAMAN KELAPA SAWIT (Elaeis guineensis Jacq.) YANG SUDAH TIDAK PRODUKTIF DI KEBUN PTP. NUSANTARA II TANJUNG GARBUS The Study of Soil Physical properties in undproductive oil palm plantations (Elaeis guin Abd Musowwir; Sumono Sumono; Nazif Ichwan
Jurnal Rekayasa Pangan dan Pertanian Vol 6, No 2 (2018): Jurnal Rekayasa Pangan dan Pertanian
Publisher : Universitas Sumatera Utara

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ABSTRACT Soil physical properties is an important factor for plant growth. The research was aimed to examine the soil physical properties in undproductive oil palm plantation (Elaeis guineensis Jacq.) at PTP. Nusantara II Tanjung Garbus. The research used survey and soil analysis methods and conducted at the Research and Technology Laboratory of the Faculty of Agriculture, University of Sumatera Utara and Research Center Laboratory of palm oil research centre in Medan. The parameters observed were soil texture, organic matter, porosity, depth of soil effectiveness, soil permeability and water availabilety. The results showed that the type of the soil on Afd. 3 PTP. Nusantara II Tanjung Garbus was Entisol, with sand clay at a depth of 5 cm and clay sandy at a depth of 25 cm, the content of organic materials at a depth of 5 cm was ranged from 1.41 % – 2.36 % and at a depth of 25 cm was ranged from 0.07 % - 1.14 %, porosity of soil at a depth of 5 cm was ranged from 46.60 % – 52.88 % and at a depth of 25 cm was ranged from 44.78% – 47.62 % with effective depth of soil in ferns, grass and reeds were 62 cm, 68 cm and 64 cm, soil permeability at a depth of 5 cm was ranged from 5.67 cm/hr – 19.76 cm/hr and at a depth 25 cm was range from 0.33 cm/hr – 0.86 cm/hr, the amount of water available for vegetated fields of grasses, grasses and reeds were 11.58%, 5.19% and 7.3%. Keywords : entisol, oil palm,physical properties of soil, PTP. Nusantara II Tanjung Garbus Estate, unproductive ABSTRAK Sifat fisika tanah merupakan faktor penting bagi pertumbuhan tanaman. Penelitian ini bertujuan untuk mengkaji sifat fisika tanah pada areal tanaman kelapa sawit (Elaeis guineensis Jacq.) yang sudah tidak produktif di kebun PTP. Nusantara II Tanjung Garbus. Penelitian menggunakan metode survei dan analisa tanah dilakukan di Laboratorium Riset dan Teknologi Fakultas Pertanian Universitas Sumatera Utara dan Laboratorium Pusat Penelitian Kelapa Sawit Medan. Parameter yang diamati meliputi tekstur tanah, bahan organik, porositas, kedalaman efektif tanah, permeabilitas tanah dan air tersedia. Hasil penelitian menunjukkan jenis tanah pada lahan Afd. 3 PTP. Nusantara II Tanjung Garbus adalah Entisol, bertekstur pasir berlempung pada kedalaman 5 cm dan lempung berpasir pada kedalaman 25 cm, kandungan bahan organik pada kedalaman 5 cm berkisar antara 1,41 % - 2,36 % dan pada kedalaman 25 cm berkisar antara 0,07 % - 1,14 %. Porositas tanah pada kedalaman 5 cm berkisar antara 46,60 % - 52,88 % dan pada kedalaman 25 cm berkisar antara 44,78 % - 47,62 %, kedalaman efektif tanah pada pakis, rumput dan ilalang yaitu 62 cm, 68 cm dan 64 cm, permeabilitas tanah pada kedalaman 5 cm berkisar antara 5,67 cm/jam - 19,76 cm/jam dan pada kedalaman 25 berkisar antara 0,33 cm/jam – 0,86 cm/jam, Jumlah air tersedia untuk lahan bervegetasi pakis, rumput dan ilalang yaitu 11,58 %; 5,19 % dan 7,3 %. Kata Kunci: entisol, kebun PTP. Nusantara II Tanjung Garbus, kelapa sawit, sifat fisika tanah, tidak produktif..

PENGARUH LAMA PENGGENANGAN TERHADAP SIFAT FISIKA TANAH LATOSOL DAN KUALITAS AIR SERTA PERTUMBUHAN TANAMAN TERUNG (Solanum melongea L.) ( Effect of Flooding on Physical Properties of Latosol Soil and Water Quality of Eggplant (Solanum melongea L.) and Thei Odie Prastomo; Sumono Sumono; Adian Rindang
Jurnal Rekayasa Pangan dan Pertanian Vol 6, No 3 (2018): Jurnal Rekayasa Pangan dan Pertanian
Publisher : Universitas Sumatera Utara

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ABSTRACT One of the factors that affect the growth of plants is apuddle. This study was aimed to assess the effect of inundation time of the latosol soil physical properties and water quality as well as the growth of eggplant (Solanum melongea L.). The method used was non factorial completely randomized design, with 3 treatments and 5 replicates, namely the condition of field capacity, flooded 1 day, 3 days to dry flooded 3 days. The parameters measured were evapotranspiration, water quality, soil physical properties, and dry weight of eggplant. Results showed that the best soil physical properties and water quality as well as the better growth of plant is in the condition flooded 1 day. Soil physical properties with flooded conditions 1 day for organic matterial content was 2.69%, porosity was 67.66%, percolation was 187cm/day, soil salinity was 12.8 mS /cm, the pH value was 6.88, and soil temperature was 27.38oC. Water quality at flooded 1 day for dissolved oxygen was 1.95 ppm, the pH value was 8.1, soil temperature was 28oC, and soil salinity was 7.4 mS/cm. The weight of plants obtained with soil conditions flooded 1 day was 80.52 g and plant height was 46.4 cm. Keywords: eggplant (Solanum melongea L.), water Quality, length of flooding, latosol soil ABSTRAK Salah satu faktor yang berpengaruh terhadap pertumbuhan tanaman adalah genangan. Penelitian ini bertujuan untuk mengkaji pengaruh lama penggenangan terhadap sifat fisika tanah latosol dan kualitas air serta pertumbuhan tanaman terung (Solanum melongea L.). Metode yang digunakan adalah rancangan acak lengkap non faktorial, terdiri dari 3 perlakuan dan 5 ulangan, yaitu kondisi kapasitas lapang, tergenang 1 hari, tergenang 3 hari kering 3 hari. Parameter yang diamati adalah evapotranspirasi, kualitas air, sifat fisika tanah, dan bobot kering tanaman terung. Hasil penelitian menunjukkan sifat fisika tanah dan kualitas air terbaik yakni pada kondisi tanah tergenang 1 hari, disertai dengan hasil pertumbuhan tanaman yang lebih baik pada kondisi tersebut. Sifat fisika tanah dengan kondisi tergenang 1 hari yakni bahan organik 2,69 %, porositas 67,66 %, perkolasi 187 cm/hari, salinitas tanah 12,8 mS/cm, pH 6,88, dan suhu tanah 27,38oC. Kualitas air tergenang 1 hari yakni oksigen terlarut 1,95 ppm, pH 8,1, suhu 28oC, dan salinitas 7,4 mS/cm. Bobot tanaman yang didapat dengan kondisi tanah tergenang 1 hari yakni 80,52 g dan tinggi tanaman 46,4 cm. Kata kunci: terung (Solanum melongea L.), kualitas air, lama penggenangan, tanah latosol

KAJIAN FERTIGASI PADA TANAMAN BAYAM (Amaranthus tricolor L.) DENGAN METODE TANAM HIDROPONIK (A Spinach Fertilization Study (Amaranthus tricolor L.) Using Hydroponic Cropping Method) Haris Nawarisa; Sumono Sumono; Nazif Ichwan
Jurnal Rekayasa Pangan dan Pertanian Vol 6, No 3 (2018): Jurnal Rekayasa Pangan dan Pertanian
Publisher : Universitas Sumatera Utara

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ABSTRACT In the hydroponic system, the nutritional requirements is given along through irrigation that is known as fertigation. In fertigation the use of fertilizers can be arranged in quantities and concentrations corresponding to the needs of the plant during plant growth to obtain optimal results of good quality. This study was aimed to examine the fertilization of spinach (Amaranthus tricolor L.)using hydroponic cropping method. Research at screen house scale consisted of 2 treatments and 26 replicates, ie irrigation for 6 hours and watering for 8 hours. The parameters observed were the concentration of AB mixed nutrient solution, water discharge, wet weight and dry weight of plant, and economic analysis. The results showed that the concentration of AB mixed solution was 3.12% N, 0,0000003% P, and 3.76% K, the average initial water discharge for 6 hours was 7.013 x 10-4 l/s, irrigation for 8 hours was 5.260 x 10-4 l/s, and the final average water discharge for watering for 6 hours was 6.303 x 10-4 l/s, for irrigation for 8 hours was 4.683 x 10-4 l/s, the wet weight of spinach was plants ranged from 9.89 to 13.05 g and the dry weight of spinach plants was ranged from 0.76 to 1.31 g, and the economic analysis of the value of NPV with interest rate of 4.25% was Rp 2,261,255.6 this means the business is feasible to run. Keywords: Fertigation, Spinach, Hydroponics ABSTRAK Pada sistem hidroponik, kebutuhan nutrisi diberikan bersamaan dengan irigasi dikenal dengan istilah fertigasi. Pada fertigasi penggunaan pupuk dapat diatur dalam jumlah dan konsentrasi yang sesuai dengan kebutuhan dari tanaman selama pertumbuhan tanaman untuk memperoleh hasil yang optimal dengan kualitas baik. Penelitian ini bertujuan untuk mengkaji fertigasi pada tanaman bayam (Amaranthus tricolor L.) dengan metode tanam hidroponik. Penelitian dalam skala rumah kasa terdiri dari 2 perlakuan dan 26 ulangan, yaitu pengairan selama 6 jam dan pengairan selama 8 jam. Parameter yang diamati meliputi konsentrasi larutan nutrisi AB mix, debit air, bobot basah dan bobot kering tanaman, dan analisis ekonomi. Hasil penelitian menunjukkan konsentrasi larutan AB mix yakni 3,12 % N, 0,0000003 % P, dan 3,76 % K, debit air awal rata-rata untuk pengairan selama 6 jam yakni 7,013 x 10-4 l/s, untuk pengairan selama 8 jam yakni 5,260 x 10-4 l/s, dan debit air akhir rata-rata untuk pengairan selama 6 jam yakni 6,303 x 10-4 l/s, untuk pengairan selama 8 jam yakni 4,683 x 10-4 l/s, bobot basah tanaman bayam berkisar 9,89 – 13,05 g dan bobot kering tanaman bayam berkisar 0,76 – 1,31 g, dan analisis ekonomi dari besarnya nilai NPV dengan suku bunga 4,25 % yakni Rp 2.261.255,6 yang berarti usaha ini layak dijalankan. Kata Kunci: Bayam, Fertigasi, Hidroponik

PENGARUH LAMA PENGGENANGAN TERHADAP SIFAT FISIKA TANAH ALUVIAL DAN KUALITAS AIR SERTA PERTUMBUHAN TANAMAN CABAI (CAPSICUM ANNUM L.) (Effect of Flooding on Physical Properties of Alluvial Soil and Water Quality of Chilli (Capsicum annuum L.) and Their Gro Sandi Wiliamsyah; Sumono Sumono; Nazif Ichwan
Jurnal Rekayasa Pangan dan Pertanian Vol 6, No 3 (2018): Jurnal Rekayasa Pangan dan Pertanian
Publisher : Universitas Sumatera Utara

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ABSTRACT One of the factors that affect the growth of plants is apuddle. This study was aimed to assess the effect of inundation time of the alluvial soil physical properties and water quality as well as the growth of pepper plants (Capsicum annuum L.). The method used was non factorial completely randomized design, with 3 treatments and 5 replicates,namely the condition of field capacity, flooded 1 day, 3 days to dry flooded three days.The parameters measured were evapotranspiration, water quality, soil physical properties, and the dry weight of pepper plants. Results showed that chili crop evapotranspiration at field capacity was 2.99 mm/day, 1 day stagnant was 1.2 mm/day and the average from 3-day was dry flooded three days was 1.55 mm/day. Dissolved oxygen in the flooded condition 1 day was 1,96 ppm, while on 3 days to dry flooded three days was 1.93 ppm. Salinity in water logged conditions 1 day was 11.6 mS/cm and 3 days to dry flooded three days was 14.34 mS/cm. The pH value of the water in water logged conditions 1 day amounted was 7.96 and in 3 days to dry flooded three days was 8.25. Porosity at field capacity condition was 52.76%, 52.82% flooded one day and flooded three dry days 3 days was 54.01%. Dry weight of pepper at field capacity was 5.13 g differs markedly with inundated one day was 3.17 g and differ significantly with flooded three days to dry three days was 0.62 g. Keywords: Alluvial Soil, Chili (Capsicum annum L.), Old Inundation, Water Quality ABSTRAK Salah satu faktor yang berpengaruh terhadap pertumbuhan tanaman adalah genangan.Penelitian ini bertujuan untuk mengkaji pengaruh lama penggenangan terhadap sifat fisika tanah Aluvial dan kualitas air serta pertumbuhan tanaman cabai (Capsicum annum L.). Metode yang digunakan adalah rancangan acak lengkap non faktorial, terdiri dari 3 perlakuan dan 5 ulangan,yaitu kondisi kapasitas lapang, tergenang 1 hari, tergenang 3 hari kering 3 hari.Parameter yang diamati adalah evapotranspirasi, kualitas air, sifat fisika tanah, dan bobot kering tanaman cabai. Hasil penelitian nilai evapotranspirasi tanaman cabai kondisi kapasitas lapang sebesar 2,99 mm/hari, , tergenang 1 hari sebesar 1,2 mm/hari dan tergenang 3 hari kering 3 hari rata-rata sebesar 1,55 mm/hari. Nilai oksigen terlarut pada kondisi tergenang 1 hari sebesar 1,96 ppm sedangkan pada kondisi tergenang 3 hari kering 3 hari sebesar 1,93 ppm. Nilai salinitas air pada kondisi tergenang 1 hari sebesar 11,6 mS/cm dan pada kondisi tergenang 3 hari kering 3 hari sebesar 14,34 mS/cm. Nilai pH air pada kondisi tergenang 1 hari sebesar 7,96 dan pada kondisi tergenang 3 hari kering 3 hari sebesar 8,25. Nilai porositas pada kondisi kapasitas lapang sebesar 52,76%, tergenang 1 hari 52,82% dan tergenang 3 hari kering 3 hari sebesar 54,01%. Bobot kering yang dihasilkan pada tanaman cabai kondisi kapasitas lapang sebesar 5,13 g berbeda nyata dengan perlakuan tergenang 1 hari sebesar 3,17 g dan berbeda sangat nyata dengan perlakuan tergenang 3 hari kering 3 hari sebesar 0,62 g. Kata kunci: Cabai (Capsicum annum L.), Kualitas Air, Lama Penggenangan, Tanah Aluvial

PENDUGAAN LAJU EROSI DENGAN METODE USLE PADA LAHAN TANAMAN KELAPA SAWIT (Elaeis guinensiss Jacq.)YANG SUDAH TIDAK PRODUKTIF DI PERKEBUNAN PTP NUSANTARA II TANJUNG GARBUS (An Estimation of Erosion Rate with USLE Method at Unproductive Palm Oil Plantatio Ughi Murphy Harahap; Sumono Sumono; Delima Lailan Sari Nasution
Jurnal Rekayasa Pangan dan Pertanian Vol 6, No 3 (2018): Jurnal Rekayasa Pangan dan Pertanian
Publisher : Universitas Sumatera Utara

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ABSTRACT In the long term, the magnitude of erosion rate that occurred in a land that had a certain slope and rain pattern for a various types of soils and land use conditions, in the long term can be predicted with USLE method aims to obtain the value of soil erosion rate on unproductive oil palm plantation (Elaeis guinensiss Jacq.) in PTP Nusantara II Tanjung Garbus plantation. The parametersobserved were the value of actual erosion, erosion tolerance (T), erotion hazard level (TBE). The results of these studies show the value of actual erosion using the USLE method on the land of Afd 2 PTPN II Tanjung Garbus for a land with fern vegetation, grass and reeds respectively are 29.55 tons / (ha.thn), 19.60 tons / (ha .thn) and 0.52 ton / (ha.thn). The value of tolerated erosion (T) for a land with fern vegetation, grass and reeds is 15.21 tonnes / ha.thn, 19.74 ton / (ha.thn) and 18 ton / (ha.thn) , and the erosion hazard level (TBE) for a land with fern vegetation, grass and reeds respectively are 1.94; 0.99 and 0.02 with moderate categories for vegetated ferns, low for grass and grass vegetation. Keywords: Erosion, Oil Palm Plantation, Unproductive, USLE. ABSTRAK Besarnya laju erosi yang terjadi di suatu lahan dengan kemiringan dan pola hujan tertentu untuk berbagai macam jenis tanah dan kondisi tata guna lahan dalam jangka waktu yang panjang dapat diprediksi dengan metode USLE. Penelitian ini bertujuan untuk memperoleh nilai besarnya laju erosi tanah pada lahan tanaman kelapa sawit (Elaeis guinensiss Jacq.) yang sudah tidak produktif dengan metode USLE di perkebunan PTP Nusantara II Tanjung Garbus. Parameter yang diamati meliputi sifat fisika tanah, kedalaman efektif tanah, prediksi erosi yang terjadi, faktor erosivitas, erodibilitas tanah, panjang dan kemiringan lereng, faktor tanaman dan konservasi lahan, erosi yang ditoleransi, dan tingkat bahaya erosi. Hasil penelitian menunjukkan besarnya nilai erosi aktual dengan menggunakan metode USLE pada lahan Afd 2 PTPN II Tanjung Garbus untuk lahan dengan vegetasi pakis, rumput dan ilalang berturut-turut sebesar 29,55 ton/(ha.thn), 19,60 ton/(ha.thn) dan 0,52 ton/(ha.thn). Nilai erosi yang ditoleransi (T) untuk lahan dengan vegetasi pakis, rumput dan ilalang berturut-turut sebesar 15,21 ton/(ha.thn), 19,74 ton/(ha.thn) dan 18 ton/(ha.thn), serta tingkat bahaya erosi (TBE) untuk lahan dengan vegetasi pakis, rumput dan ilalang berturut-turut sebesar 1,94; 0,99 dan 0,02 dengan kategori sedang untuk lahan bervegetasi pakis, rendah untuk lahan bervegetasi rumput dan ilalang. Kata Kunci: Erosi, Lahan kelapa sawit, Tidak produktif, USLE.

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