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All Journal HAYATI Journal of Biosciences Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) AGRITROP Jurnal Natur Indonesia Jurnal Teliska Jurnal AgroBiogen AGRIVITA, Journal of Agricultural Science Planta Tropika Jurnal Ampere Jurnal Penelitian Karet JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA Jurnal Penelitian Pertanian Tanaman Pangan Journal of Tropical Crop Science Sainstek : Jurnal Sains dan Teknologi Buletin Palma International Journal of Research in Vocational Studies (IJRVOCAS)

Sudirman Yahya

Departemen Agronomi Dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor (Bogor Agricultural University), Jl. Meranti Kampus IPB Darmaga, Bogor 16680, Indonesia

Author-ID : 421456

Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Exogenous Application of Calcium, α-Naphthaleneacetic Acid and 1Methylcyclopropene Improved Fruit Growth and Oil Yield of Oil Palm (Elaeis guineensis Jacq.) Grown on Ultisol Sopandie, Didy; Hidayah, Agus Nur; Yahya, Sudirman
AGRIVITA Journal of Agricultural Science Vol 46, No 1 (2024)
Publisher : Faculty of Agriculture University of Brawijaya in collaboration with PERAGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17503/agrivita.v46i1.4115

Soil acidity is one of the main factors limiting the growth and sustainable production of oil palm in Indonesia. The aim of this study was to evaluate the effect of various exogenous compounds on improving fruit growth and oil yield of palm oil grown on Ultisol. The experiment employed three treatments which were arranged in a Randomized Complete Block Design (RCBD) with three replications. The treatments were: 1-MCP (0, 100, 200, and 300 ppm), CaCl2 (0 and 50 ppm) and NAA (0 and 200 ppm). Application of Ca2+, NAA and 1-MCP either single or in combination improved fruit growth and oil yield by increasing almost all variables, except the number of bunches, bunch weight and fruit set. The 100 ppm 1-MCP + 50 ppm Ca2+ + 200 ppm NAA treatments showed the highest oil-to-dry mesocarp content. To get the highest oil to bunch (OB), the combination of 100 ppm 1-MCP + 200 ppm NAA; 50 ppm Ca2+ + 200 ppm NAA, and a single treatment of 50 ppm Ca2+ were very promising to be utilized.

Permodelan Pertumbuhan dan Produksi Kelapa Sawit pada Berbagai Taraf Penunasan Pelepah Gromikora, Nope; Yahya, Sudirman; ,, suwarto
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 42 No. 3 (2014): Jurnal Agronomi Indonesia
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

ABSTRACTThe numbers of leaf frond influence oil palm yield, especially fresh fruit bunch weight and fresh fruit bunch production. The objective of this research was to obtain oil palm growth and production model for different levels of frond pruning. The experiment was conducted at PT. Astra Agro Lestari, Pangkalan Bun, Central Kalimantan, from August 2010 to February 2012. The experiment was arranged in a randomized block design with two factors and three replications for each oil palm age. The first factor was numbers of unpruned frond and the second factors was pruning seasons. The frond treatment consisted of 41-48, 49-56, and 57-64 fronds. The pruning seasons consisted of first period (early to mid rainy season: September-December), second period (mid to end of rainy season: Januari-April), and third period (dry season: May-August). Stella production model was created based on pruning experiment and weather data. The constructed production model was able to estimate 75% variable of oil palm production and fresh fruit bunch weight at different levels of pruning. Keywords: oil palm, pruning management, Stella model

Identification of Gene Related to Hard Bunch Phenotype in Oil Palm (Elaeis guineensis Jacq.) ,, Roberdi; ,, Sobir; Yahya, Sudirman; Toruan-Mathius, Nurita; Liwang, Tony
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 43 No. 2 (2015): Jurnal Agronomi Indonesia
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

ABSTRACTMolecular genetic analysis of hard bunch phenomenon in oil palm was done in order to elucidate the role of genetic factor underlying hard bunch in oil palm plantation. The aim of this study was to identify the AFLP primer combination that co-segregates with hard bunch phenotype related gene in oil palm. Molecular analysis was done by bulk segregant analysis approach. DNA was isolated from leaves of the normal and hard bunch palm. DNA from ten individual palms from each category were pooled and used as a template. A total of 56 AFLP primer combinations were selected for selection of polymorphic primer, and as a result it was found that 22 AFLP primer combinations (39.28%) were polymorphic. A total of 48 individual of palm DNA containing 24 individual for each group were further genotyped by those 22 polymorphic markers. Of these, one AFLP primer combination (E-ACC/M-CTG) was obtained as a co-segregated marker that distinguished the hard bunch DNA from the normal one. Based on the analysis of the target sequence aligned to the oil palm DNA sequences available in database, we found that our sequence has similarity with Ty-1 copia retrotransposon. This sequence distribute in all 16 linkage group of oil palm genome.Keywords: abnormal fruits, AFLP, oil palm, Ty-1 copia retrotransposon

Optimasi Paket Pupuk Tunggal pada Tanaman Kelapa Sawit Belum Menghasilkan Umur Satu Tahun Saputra, Hidayat; ,, Sudradjat; Yahya, sudirman
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 43 No. 2 (2015): Jurnal Agronomi Indonesia
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

ABSTRACTEffective and efficient fertilization is affected by fertilizer dose, and therefore information on the appropriate dose of a single fertilizer for oil palm will be beneficial to increase the efficiency and effectiveness of fertilization in oil palm plantations. The objectives of this research were to study the response patterns and to determine optimum rate of single fertilizer package related to the growth of one year old oil palm trees. The experiment was conducted from March 2013 to February 2014 at IPB-Cargill Teaching and Research Farm of Oil Palm, Jonggol Bogor. The experiment was arranged in randomized block design with one factor and replicated three times. The treatments were four single fertilizer package as followed: control, 300 g urea + 375 g SP-36 + 350 g KCl + 25 g boric acid + 25 g CuSO4.5H2O, 600 g urea + 750 g SP-36 + 700 g KCl + 25 g boric acid + 25 g CuSO4.5H2O, 900 g urea + 1125 g SP-36 + 1050 g KCl + 25 g boric acid + 25 g CuSO4.5H2O per plant. The result showed that application of single fertilizer package significantly increased the growth of young oil palm linearly as shown by plant height, stem girth, leaf area of frond number 9, chlorophyll and P content of the leaves and quadratically on leaf number at the last observation. The optimum rate of single fertilizer for one year old oil palm trees had not been attained at this research because the plant growth response to fertilization was still linear.Keywords: inorganic, leaf frond number 9, optimum rate, growth response, stem girth

Produktivitas Tiga Genotipe Kedelai dengan Air Berbeda dan Kedalaman Muka Air pada Berbagai Kondisi Tanah di Pasang Surut Pujiwati, Hesti; Aziz, Sandra A.; Ghulamahdi, Munif; Yahya, Sudirman; Haridjaja, dan Oteng
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 44 No. 3 (2016): Jurnal Agronomi Indonesia
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

ABSTRACTSoybean extensification on mineral and peaty mineral soils of tidal land are limited by Al and Fe toxicity. Modification of growing environment and the use of tolerant variety are the possible alternatives to overcome the limitation. The research was aimed to study soybean productivity in various soil types with different depth of water level and different water compositions. The experiment was held under mineral, peaty mineral soils with interaction types B and C of tidal swamp in Banyuasin, South Sumatera from May to August 2014. At each location, there was a three factor experiment was arranged in a split-split plot design. The first factor was two water depth (10 and 20 cm), the second factor was three varieties (Tanggamus, Cikuray, Ceneng) and third factor was three different water compositions (river water, peat water, high-tide water). The results showed productivity on mineral soil types C, peaty mineral soil types B, and mineral soil types B were 4:50, 3.65, 0:32 ton ha-1 respectively. In peaty mineral soil types B, Ceneng with a depth of 20 cm water level resulted in highest productivity. In the mineral soil overflow type B, Cikuray with peat water composition had highest productivity.Keywords: mineral, peaty mineral, sensitive, tolerant

Perpektif Baru: Manajemen Vegetasi Bawah Tegakan Pada Budidaya Kelapa Sawit Berkelanjutan Yahya, Sudirman; Mira Ariyanti; Yenni Asbur
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 50 No. 3 (2022): Jurnal Agronomi Indonesia
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

Sesama tumbuhan, antara tanaman pokok dan tumbuhan lainnya, sampai tingkat tertentu bersaing dalam mendapatkan sumberdaya lingkungan tumbuh, terutama air dan hara media tumbuh, ruang tumbuh dan unsur iklim mikro. Sehubungan dengan ini, tumbuhan atau vegetasi bawah tegakan dapat ditinjau seberapa besar daya menyaingi dibandingkan dengan besar daya manfaat, baik secara langsung bagi tanaman pokok, pengelolaan kebun maupun terhadap segi lingkungan. Pada tinjauan ini akan diungkapkan keberadaan tumbuhan atau vegetasi bawah tegakan yang lazim yang berperanan sebagai penutup tanah dengan berbagai manfaat dalam mewujudkan teknologi produksi kelapa sawit berkelanjutan. Ada beberapa peubah yang lazim diamati sebagai dampak positif penerapan teknologi produksi berkelanjutan, di antaranya: penurunan emisi gas rumah kaca CO2, peningkatan cadangan karbon, biodiversitas lingkungan, perbaikan neraca air dan hara tanah, koservasi tanah dan air, dan penekanan erosi. Dalam naskah ini akan diungkap dan ditelaah beberapa peubah tersebut sebagai dampak teknologi produksi, khususnya oleh dua spesies vegetasi bawah Nephrolepis biserrata dan Asystasia gangetica. Kata kunci: biodiversitas, cadangan karbon, neraca air, neraca hara

Adaptability assessment of three spice plant as understory plants in oil palm (Elaeis guineensis Jacq.) cultivation Edvanido, Hijrianto; Yahya, Sudirman; Kurniawati, Ani
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 51 No. 2 (2023): Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy)
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24831/ija.v51i2.47351

Utilization of land with intercrop plants can support the productivity of the land. The wide spacing of oil palm plants can be used to plant intercrops. Spice plants such as red ginger, turmeric, and cardamom are examples of intercropping plants under the shade of oil palm. This study aimed to determine the adaptability of red ginger, turmeric, and cardamom as understorey plants of different oil palm ages. The research was carried out from February to November 2021 at Sekernan, Muaro Jambi, Jambi. The study consisted of three experiments to investigate three spice plants. Each experiment used a randomized complete block design (RCBD) with oil palm ages as treatments, namely 0, 5, 10, 15, and 20 years. Variables observed included light intensity, plant height, tiller number, leaf number, and rhizome weight. The red ginger and turmeric were considered as adaptive plants to understorey conditions due to the yield of > 60% in 15-year-old oil palm trees than those grown in non-shade conditions. Production levels of red ginger and turmeric were determined by the number of tillers and leaves. The cardamom plant under oil palm shade produced a better yield than that in control. This implies that all three spices are suitable as intercrop plants under oil palm plantations. Keywords: cardamom; low light intensity; red ginger; shade stands; turmeric

Root cutting on growth and yield of oil palm (Elaeis guenesis Jacq.) Wahyudin, Cecep; Hariyadi; Sudrajat; Yahya, Sudirman; Anwar, Syaiful
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 52 No. 1 (2024): Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy)
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24831/jai.v52i1.48160

Root cutting is speculated able to increase nutrient uptake by oil palm. The objective of this study was to investigate the effect of root trimming on the growth, flowering, and yield of oil palm. The research focused on oil palm plants aged five years old in the field. The experiment used a nested design with two key factors: root-cutting depth as the main plot and root-pruning intensity as the subplot. Results showed that root cutting at a depth of 0 to 20 cm from the soil surface followed by cutting intensities of 50% and 75% enhanced plant height at 0, 3, and 9 months after treatment. The treatments did not affect other variables including flowering and yield of oil palm trees. Keywords: bunch weight; cutting intensity; root trimming; sex ratio

Co-Authors AA Sudharmawan, AA Ade Wachjar Ade Wachjar ADEEL ABDUL KARIM ALTUHAISH Agus Purwito Aiyen Tjoa Alfian, Anggra Amperawan Amperawan, Amperawan Andi Besse Poleuleng Ani Kurniawati ASMARLAILI SAHAR Bari, Abdul Bofynna, Pio Agma Chairani Hanum Chairani Hanum Desta Wirnas Dharend Lingga Wibisana Diana Sofia Hanafiah DIDI SOPANDY Didy Sopandie Edvanido, Hijrianto Febbiyanti, Tri Rapani Febriani, Alda Haridjaja, dan Oteng Haridjaja, Oteng Hariyadi Hariyadi Hariyadi Hariyadi, nfn Herdhata Agusta HESTI PUJIwATI Hesti Pujiwati Hidayah, Agus Nur Hidayat Saputra, Hidayat Ida Nur Istina, Ida Nur Ilyas Marzuki KOMARUDIN IDRIS Kukuh Murtilaksono Kusumawati, Sri Ambar Mahulette, Asri Subkhan Marniati, Yessi Miftahudin . Mira Ariyanti Muhammad, Fakhry Munif Ghulamahdi Nofiansah Nope Gromikora Nunyai, Aslina Putri Nurita Toruan-Mathius Pambudi, Ignatius Harry Tri Pienyani Rosawanti Purwono Purwono, Purwono Rasyad, Sabilal Retno Prihatini Roberdi ,, Roberdi Rumiasih Saijo Sandra A. Aziz Sandra Arifin Aziz Simanjuntak, Hiskia Siregar, Hasril H. Siswahyudianto Sobir Sobir Sofiana, Yelli Sri Mulatsih Sri Mulatsih Subandi, Subandi Sudradjat , Sudradjat Sudradjat Sudrajat Suryo Wiyono Sutarta, Edy Sigit Sutarta Sigit Sutoro, Sutoro Suwarto Suwarto Suyadi, Andri Syaiful Anwar Tony Liwang Tri Rapani Febbiyanti, Tri Rapani Trikoesoemaningtyas Wahyu Hidayat WAHYU Q. MUGNISJAH Widodo Widodo Yani, Herman Yayat Hidayat Yenni Asbur Zaman, Sofyan

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