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All Journal Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Jurnal Sumberdaya Alam dan Lingkungan Jurnal Penelitian Pertanian Terapan Jurnal Agro Industri Perkebunan JURNAL PERTANIAN PRESISI (JOURNAL OF PRECISION AGRICULTURE) Journal of Tropical Crop Science Agritrop : Jurnal Ilmu-Ilmu Pertanian (Journal of Agricultural Science)

Yan Sukmawan, Yan

Jurusan Budidaya Tanaman Perkebunan, Politeknik Negeri Lampung Jl. Soekarno-Hatta No. 10 Rajabasa, Bandar Lampung 35144, Indonesia

Author-ID : 559755

Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Economics, Econometrics & Finance

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Articles

Influence of Manure, Nitrogen, Phosphorus and Potassium Fertilizer Application on Growth of One-year-old Oil Palms on Marginal Soil in Jonggol, Bogor, Indonesia Sudrajat, Sudradjat; Sukmawan, Yan; Sugiyanta, Sugiyanta
Journal of Tropical Crop Science Vol 1 No 2 (2014): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

The oil palms (Elaeis guineensis Jacq.) are highlyefcient oil producers. It produces ve to seven timesmore vegetable oil per hectare than soybean, sunower,and rapeseed. The objectives of this research were tostudy the role of organic and N, P, and K fertilizers ongrowth of one-year-old immature oil palm on marginalsoil in Jonggol. The research was conducted at IPBCargill Teaching Farm (ICTF) of Oil Palm, Jonggol,Bogor,West Java from March 2013 to March 2014. Theexperiment was arranged in a factorial experimentfollowing a randomized block design with threereplications. The rst factor was organic fertilizer(manure) consisting of 0 (O), 15 (O1) and 30 (O2) kg pertree per year. The second factor was inorganic fertilizerconsisting of 0 (S0); 0.25 kg N + 0.25 kg P O + 0.39 kg 2 5K O(S ) 0.50 k N+ 0.50 kg P O + 0.78 kg K O(S ) 2 25 2 1and g 2per tree. The results demonstrated that application ofmanure up to 30 kg per tree per year did not affect thegrowth of one-year-old oil palm. Application of 0.50 kg N+ 0.50 kg P O + 0.78 kg K O highest 2 5 2 per tree gave theresult in increasing frond production, stem girth, and leafnutrient concentration. The results of leaf analysis andplant growth responses suggested that the rates ofmanure and inorganic fertilizers applied in this study arenot sufcient to improve young oil palm growth inmarginal soil in Jonggol.Keywords: cow manure, critical nutrient level, inorganicfertilizer, soil fertility, vegetative growth

Penentuan Waktu Pemisahan Bibit Kembar Kelapa Sawit (Elaeis guineensis Jacq.) Asal Benih Multi Embrio di Pembibitan Sukmawan, Yan
Jurnal Penelitian Pertanian Terapan Vol 17, No 2 (2017)
Publisher : Politeknik Negeri Lampung.

The oil palm (Elaeis guineensis Jacq.) seed generally in form of germinated seed. Germinated seed purchased from oil palm seed producers often contained twin seedlings. The twin seedlings must be separated in pre-nursery before transplanted to the main-nursery. The aim of this research was to determine the best time of oil palm twin seedlings separation in nursery. The research was conducted on April to November 2016 in Politeknik Negeri Lampung. Single-factor experiment was arranged in randomized block design with three replications. The treatment was the age of twin seedling i.e.: 8 weeks after sowing (W1), 9 weeks after sowing (W2), 10 weeks after sowing (W3) and 11 weeks after sowing (W4). The data were analysed by general linear model analysis of variance (ANOVA). The means were separated using HSD at ?=5% level. The result show the best time to separate the twin seedling in pre-nurserys is 9-11 weeks after sowing. Keywords: main-nursery, multi embryo, pre-nursery, twin seedlings

Respons Setek Kopi Robusta (Coffea Canephora Pierre Ex Frochner) Terhadap Berbagai Konsentrasi Auksin Puspita, Natalia; Sukmawan, Yan; Supriyatdi, Dedi
AGRITROP Vol 18, No 2 (2020): Agritrop: Jurnal Ilmu-Ilmu Pertanian
Publisher : Universitas Muhammadiyah Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32528/agritrop.v18i2.3886

Klon kopi robusta (Coffea canephora Pierre ex Frochner) yang tidak dapat dipercaya yang berbeda-beda. Upaya mempercepat pertumbuhan setek dapat dilakukan dengan mempersembahkan auksin. Penelitian ini bertujuan untuk mendapatkan konsentrasi auksin terbaik pada pertumbuhan setek kopi robusta klon -BP 308. Penelitian berlangsung selama 4 bulan mulai dari 18 November 2019 hingga 18 Maret 2020 di Kebun Percobaan dan Laboratorium Analisis Politeknik Negeri Lampung. Penelitian menggunakan Rancangan Acak Kelompok (RAK) dengan lima ulangan. Perlakuan yang diterapkan adalah instrumen pengendapan yang terdiri atas 0 ppm (Z 0 ), 100 ppm (Z 1 ), 200 ppm (Z 2 ), 300 ppm (Z 3 ), dan 400 ppm (Z 4 ). Variabel pengamatan dari penelitian termasuk proporsi setek hidup, jumlah daun, volume akar, bobot basah akar, bobot kering akar, bobot basah tajuk, dan bobot kering tajuk. Berdasarkan hasil dan pembahasan dapat disangkal bahwa memberikan auksin dengan konsentrasi 300 ppm mampu meningkatkan jumlah daun setek kopi pada 2 BST.

Pengaruh KNO3 pada Pertumbuhan Cabang Orthotrop Tanaman Induk Lada (Pipper nigrum L.) Tahun Pertama Dewanda, Muhammad Taufiek; Sukmawan, Yan; Utoyo, Bambang
AGRITROP Vol 18, No 2 (2020): Agritrop: Jurnal Ilmu-Ilmu Pertanian
Publisher : Universitas Muhammadiyah Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32528/agritrop.v18i2.3888

Tanaman induk adalah sumber bahan tanam yang ditanam pada areal lahan yang tidak terlalu luas yang mana tidak sampai menghasilkan buah. Fungsi pupuk KNO3 dapat meningkatkan ketahanan tanaman serta dapat memicu pertumbuhan dan perkembangan fisiologis tanaman. Penelitian bertujuan untuk mencari konsentrasi KNO3 terbaik untuk pertumbuhan cabang ortotrop tanaman induk lada tahun pertama. Penelitian menggunakan 4 taraf perlakuan konsentrasi KNO3 yaitu K0 (Kontrol), K1 (2%), K2 (4%), dan K3 (6%), menggunakan rancangan acak kelompok faktor tunggal dengan tiga ulangan. Data pengamatan dianalisis ragam uji F taraf 5%, apabila terdapat perbedaan pengaruh yang signifikan maka dilanjutkan dengan uji Beda Nyata Terkecil (BNT). Variabel yang diamati pada penelitian ini adalah tinggi cabang ortotrop, jumlah daun, jumlah ruas cabang ortotrop, jumlah cabang ortotrop yang tumbuh, indeks kehijauan daun, dan luas daun. Hasil penelitian menunjukkan bahwa aplikasi pupuk KNO3 berpengaruh pada variabel jumlah daun dan jumlah ruas pada umur 4 dan 5 Bulan Setelah Perlakuan (BSP), sedangkan variabel tinggi cabang ortotrop, jumlah cabang orthotrop, indeks kehijauan daun, dan luas daun tidak dipengaruhi oleh KNO3.Kata kunci: Tanaman induk, KNO3, cabang ortotrop

UJI EFEKTIVITAS HERBISIDA NABATI EKSTRAK RIMPANG ALANG-ALANG (Imperata cylindrica (L.) P. Beauv.), BRANDJANGAN (Rottboellia cochinchinensis (Lour.) W.D. Clayton), DAN LAMPUYANGAN (Panicum repens L.) PADA GULMA DI PERTANAMAN KOPI Hidayat, Khoerul Anwar; Riniarti, Dewi; Widiyani, Dimas Prakoswo; Sukmawan, Yan
Jurnal Pertanian Presisi (Journal of Precision Agriculture) Vol 7, No 2 (2023): Jurnal Pertanian Presisi
Publisher : Universitas Gunadarma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35760/jpp.2023.v7i2.9331

Keberadaan gulma dapat menyebabkan penurunan produksi dan kerusakan pada tanaman kopi. Umumnya petani mengendalikan gulma menggunakan herbisida sintetis yang mengandung senyawa glifosat yang memiliki sifat toksik bagi kopi. Oleh karena itu, alternatif lain yang dapat digunakan adalah herbisida nabati yang mengandung senyawa alelokimia (alelopati). Penelitian ini bertujuan untuk mendapatkan jenis herbisida nabati yang terbaik dari tumbuhan rimpang alang-alang (Imperata cylindrica (L.) P. Beauv.), brandjangan (Rottboellia cochinchinensis (Lour.) W.D. Clayton), dan lampuyangan (Panicum repens L.) untuk pengendalian gulma di pertanaman kopi. Penelitian ini dilaksanakan di lahan praktikum tanaman kopi belum menghasilkan dan Laboratorium Analisis Politeknik Negeri Lampung pada Oktober - Desember 2022. Penelitian ini menggunakan RAK faktor tunggal dengan 6 ulangan. Perlakuan nya yaitu B0 = kontrol, B1 = ekstrak rimpang alang-alang, B2 = brandjangan, dan B3 = lampuyangan. Volume semprot sebanyak 660 ml.plot-1 dengan konsentrasi ekstrak herbisida 16%, Jika berbeda nyata di uji lanjut BNT 5%. Variabel penelitian terdiri dari identifikasi gulma, jumlah gulma, jenis gulma, Summed Dominance Ratio (SDR), tingkat kematian gulma, dan bobot kering gulma. Temuan dari penelitian ini adalah herbisida nabati ekstrak rimpang alang-alang, brandjangan, dan lampuyangan dengan konsentrasi 16%, tidak berbeda nyata pada pengendalian gulma di pertanaman kopi karena dengan konsentrasi 16% tidak memberikan dampak yang fatal pada gulma.

Evaluasi Dampak Lingkungan pada Pembibitan Kelapa Sawit (Elaeis guineensis Jacq.) dengan Pendekatan Penilaian Daur Hidup Sukmawan, Yan; Dewi, Rosita; Riniarti, Dewi; Agusta, Herdhata; Sudradjat, Sudradjat
Jurnal Sumberdaya Alam dan Lingkungan Vol 11, No 2 (2024)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jsal.2024.011.02.2

ABSTRAK Sebagai tahap awal dalam siklus hidup tanaman kelapa sawit (Elaeis guineensis Jacq.), praktik pembibitan kelapa sawit menjadi aspek penting yang memerlukan evaluasi lebih dalam. Pemahaman mengenai dampak lingkungan pada fase pembibitan adalah kunci untuk merancang strategi pengelolaan yang berkelanjutan, mengurangi kerusakan ekosistem, dan mencapai keseimbangan antara produksi dan konservasi alam. Penelitian ini bertujuan untuk menganalisis dampak lingkungan pembibitan kelapa sawit di Unit Pembibitan Kelapa Sawit (UPKS) Politeknik Negeri Lampung menggunakan pendekatan penilaian daur hidup atau life cycle assessment (LCA). Studi ini difokuskan pada penilaian daur hidup gate-to-gate yang dilaksanakan dari Oktober hingga Desember 2023. Data dikumpulkan melalui kunjungan lapang dan wawancara dengan pengelola UPKS. Ruang lingkup LCA dimulai dari penerimaan kecambah hingga bibit siap salur. Permodelan dampak lingkungan menggunakan openLCA versi 2.0.3 dengan metode CML-IA baseline dan database pendukung Agribalyse v3.0.1. Hasil penelitian menunjukkan bahwa secara umum pembibitan kelapa sawit memberikan dampak lingkungan yang tidak signifikan. Kontribusi dampak lingkungan terbesar berasal dari dampak sekunder, khususnya marine aquatic ecotoxicity sebesar 190.52122 kg 1,4-DB eq. dan abiotic depletion (fossil fuels) sebesar 5.65733 MJ. Dampak primer potensi global warming (GWP100a) sebesar 0.27033 kg CO2 eq. yang dominan berasal dari penggunaan polybag dan potensi human toxicity sebesar 0.08227 kg 1,4-DB eq. Upaya pengurangan dampak lingkungan dapat dilakukan dengan penggunaan pot tray yang dapat digunakan berulang kali atau alternatif polybag dari bahan organik, kombinasi pupuk anorganik dan pupuk organik untuk mengurangi dosis pupuk anorganik, dan mengurangi laju evapotranpirasi dari tanaman dan media tanam dengan penggunaan mulsa organik dan media tanam yang mengandung bahan organic. Kata kunci: dampak lingkungan, kelapa sawit, LCA, pemanasan global, pembibitan ABSTRACT As the initial stage in the oil palm (Elaeis guineensis Jacq.) plant life cycle, oil palm seedling cultivation becomes a crucial aspect that requires in-depth evaluation. Understanding the environmental impact at the seedling phase is critical to designing more sustainable management strategies, reducing ecosystem damage, and achieving a balance between production and conservation. This study aims to present an environmental impact analysis of oil palm seedling cultivation at the Oil Palm Nursery Unit (UPKS) of Politeknik Negeri Lampung using the life cycle assessment (LCA) approach. This study focuses on a gate-to-gate life cycle assessment conducted from October to December 2023. Data were collected through field visits and interviews with UPKS managers. The LCA scope covers from seed acceptance to ready-to-distribute seedlings. Environmental impact modeling used openLCA version 2.0.3 with the CML-IA baseline method and supporting database Agribalyse v3.0.1. Results indicate that oil palm seedling nursery generally has an insignificant environmental impact. The most substantial contributions come from secondary impacts, mainly marine aquatic ecotoxicity at 190.52122 kg 1,4-DB eq. and abiotic depletion (fossil fuels) at 5.65733 MJ. Primary impacts are potential global warming (GWP100a) at 0.27033 kg CO2 eq., primarily from polybag use, and potential human toxicity at 0.08227 kg 1,4-DB eq. Efforts to mitigate environmental impacts can be achieved by using reusable pot trays or organic material-based polybags as alternatives, coupled with a combination of inorganic and organic fertilizers to reduce the dosage of inorganic fertilizers. Additionally, curtailing evapotranspiration rates from plants and growing media can be accomplished by employing organic mulch and growing media enriched with organic matter. Keywords: environmental impact, global warming, LCA, nursery, oil palm

Front Matter Jurnal Agro Industri Perkebunan Volume 9 Nomor 1 Tahun 2021 Sukmawan, Yan
Jurnal Agro Industri Perkebunan Vol. 9 No. 1 (2021)
Publisher : Politeknik Negeri Lampung

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Front Matter Jurnal Agro Industri Perkebunan Volume 9 Nomor 1 Tahun 2021

Back Matter Jurnal Agro Industri Perkebunan Volume 9 Nomor 1 Tahun 2021 Sukmawan, Yan
Jurnal Agro Industri Perkebunan Vol. 9 No. 1 (2021)
Publisher : Politeknik Negeri Lampung

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Effectiveness of Various Foliar Fertilizer on the Growth and Performance of Oil Palm (Elaeis guineensis Jacq.) Seedlings in Main Nurseries Sukmawan, Yan; Riniarti, Dewi
Journal of Tropical Crop Science Vol. 9 No. 01 (2022): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jtcs.9.01.1-7

Fertilizer can be applied through soil and leaves. Fertilizer application through leaves is more effective than soil application due to faster nutrient absorption. This study aims to determine the effectiveness of applying various foliar fertilizer compositions on the growth and performance of oil palm seedlings. The research was conducted from April 2020 to September 2020 at the Oil Palm Nursery Unit at Politeknik Negeri Lampung. A single factor in a completely randomized design with four replications was used in the experiment. The treatment involved the nutrient composition of foliar fertilizer consisting of five levels, namely control (no fertilizer), NPK 20-15-15, NPK 27-18-9, NPK 11-8-6, and NPK 27.5-5.5-4.8. Measurements were made on seedling height, stem diameter, number of leaves, leaf greenness, rachis length, and leaflet length. The data were analyzed by means of variance, followed by orthogonal contrast if the result was significantly different. The results showed that the application of foliar fertilizers could increase the growth of seedling height, stem diameter, number of leaves, leaf greenness index, rachis length, and leaflet length. Generally, a foliar fertilizer application gives better results than without a foliar fertilizer application (control). There was no difference in the powder and liquid foliar fertilizer effect on increasing the growth of oil palm seedlings. The formulation of NPK 20-15-15 and NPK 11-8-6 foliar fertilizer had a better effect on the leaf greenness index of oil palm seedlings.

Peranan Pupuk Organik dan NPK Majemuk terhadap Pertumbuhan Kelapa Sawit TBM 1 di Lahan Marginal Sukmawan, Yan; ,, Sudradjat; ,, Sugiyanta
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 43 No. 3 (2015): Jurnal Agronomi Indonesia
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

ABSTRACTOil palm (Elaeis guineensis Jacq.) is the most efficient vegetable oil producer. It produces five to seven times more vegetable oil per hectare than the other vegetable oil producing crops. The objective of this research was to study the role of organic and NPK compound fertilizers application to one-year-old oil palm (Elaeis guineensis Jacq.) on marginal land. The research was conducted at IPB-Cargilll Teaching Farm of Oil Palm, Jonggol, Bogor, West Java from March 2013 to March 2014. The experiment was carried out as factorial experiment in a randomized block design with three replications. The first factor was organic fertilizer consisted of 0, 15, and 30 kg per palm. The second factor was NPK compound fertilizers 15:15:15 consisted of 0, 1.3 and 2.6 kg per palm. The results showed that no interaction effect between organic and NPK compound fertilizers on all of variables observed. Marginal soils in Jonggol required high rate of fertilizers to produce good performance of one-year-old oil palm. Application of 30 kg organic fertilizer per palm or 2.6 kg NPK compound fertilizers 15:15:15 per palm resulted in the highest vegetative growth of one-year-old oil palm on marginal land in Jonggol.Keywords: cow dung, critical nutrient level, slow release fertilizer, Ultisols, vegetative growth

Co-Authors Bambang Utoyo Dewanda, Muhammad Taufiek Dewi Riniarti Herdhata Agusta Hidayat, Khoerul Anwar Luh Putu Ratna Sundari Puspita, Natalia Rosita Dewi Sudradjat , Sudradjat Sudradjat Sugiyanta , Supriyatdi, Dedi Widiyani, Dimas Prakoswo

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