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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 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

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PERANCANGAN SISTEM MONITORING LEVEL CAIRAN MENGGUNAKAN POWER LINE COMMUNICATIONS Amperawan, Amperawan; Yahya, Sudirman; Nurdin, Ali; Rasyad, Sabilal
JURNAL AMPERE Vol 1, No 2 (2016): JURNAL AMPERE
Publisher : Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (25.536 KB)

ABSTRAKPower line communications adalah suatu alat yang digunakan untuk berkomunikasi melalui label listrik (tegangan tinggi), teknik ini merupakan terobosan baru yang banyak dikembangkan saat ini. Secara umum level cairan yang digunakan untuk mengukur volume cairan didalam suatu tangki penampungan dengan cara manual melalui pipa kaca atau pipa transparan. Metode manual tersebut tidak dapat mengukur jumlah cairan didalam tangki secara tepat melalui pengembangan power line communications, jumlah cairan di dalam tangki penampungan ditentukan secara akurat dari jarak jauh. Desain alat ukur monitor volume cairan ini mengunakan Arduino UNO, sebagai sensor pembacanya melalui sensor ultrasonic.Â Selanjutnya, komunikasi melalui power line communications akan menampilkan visual data volume dan waktu pengisian. Tujuan studi ini adalah memungkinkan untuk memonitor jumlah cairan dalam tangki penampungan dari jarak jauh melalui proses power line communicationsÂ tipe 7 inova 200 Mb Melalui jaringan komputer. Di dalam studi ini, pembacaan volume cairan yang ditampilkan secara visualÂ pada program delphi melaluiÂ power line communications sebagai client dan power line communications sebagai server pada tegangan 220 Vac menghasilkan volume yang sama.Â Kata Kunci : Power Line Communications,Â Arduino Uno, Sensor Ultrasonic

Tanggap Kedelai Hitam terhadap Cekaman Aluminium pada Kultur Hara Pujiwati, Hesti; Ghulamahdi, Munif; Yahya, Sudirman; Aziz, Sandra Arifin; Haridjaja, Oteng
Jurnal Penelitian Pertanian Tanaman Pangan Vol 35, No 2 (2016): Agustus 2016
Publisher : Pusat Penelitian dan Pengembangan Tanaman Pangan

Al-stress on soybean causes inhibited root growth. Root length sensitivity index might be an indicator of roots tolerance to Alstress. Hematoxylin staining can be used to visualize the movement of Al in plant root tissues. This study was aimed to determine the tolerance level of soybean genotypes to the gradual Al concentrations. The experiment was conducted from February to April 2014, at the greenhouse in Cikabayan Experiments Garden, IPB, using a 4 x 3 factorial treatments in a completely randomized design, three replications. The first factor was the concentration of Al ie: without Al (A0); 0.5 mM Al (A1); 0.7 mM Al (A2) and 0.9 mM (A3). The second factor was the soybean varieties including: Tanggamus, Cikuray, and Ceneng. The observation of variable included root length sensitivity index based on hematoxylin staining, demonstrating the movement of Al on the tolerance and sensitive varieties. Results showed that: 1) Tanggamus was tolerance at 0.5 mM Al concentration and was moderate at 0.7 and 0.9 mM Al, 2) Cikuray was tolerance to a concentration up to 0.5 mM and was moderate at 0.7 mM Al but was sensitive to the concentration of 0.9 mM Al, 3) Ceneng was sensitive at concentration of 0.5 to 0.9 mM Al, 4) Staining hematoxylin indicated the root tissue advanced damages and darker blue color on the susceptible varieties, in comparison with the tolerant ones.

PENGARUH PH DAN WAKTU PENYIMPANAN TERHADAP PERTUMBUHAN Lasiodiplodia theobromae PENYEBAB KANKER BATANG TANAMAN KARET Febbiyanti, Tri Rappani; Widodo, Widodo; Wiyono, Suryo; Yahya, Sudirman
Jurnal Penelitian Karet JPK : Volume 37, Nomor 1, Tahun 2019
Publisher : Pusat Penelitian Karet - PT. Riset Perkebunan Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/ppk.jpk.v37i1.615

Lasiodiplodia theobromae merupakan cendawan penyebab kanker batang pada tanaman karet (Hevea brasiliensis Muel Arg.), penyakit ini merupakan penyakit baru dan belum pernah dilaporkan sebelumnya di Indonesia. Banyak cara yang dapat dilakukan untuk mengendalikan penyakit kanker batang. Strategi pengendalian yang terbaik adalah dengan pengelolaan penyakit yang membutuhkan pengetahuan mengenai ekobiologi patogen, inang, dan interaksinya dengan lingkungan biotik dan abiotik. Pengendalian patogen harus didasarkan pada pengetahuan tentang bioekologinya. Diharapkan dengan pengetahuan bioekologi bisa dijadikan dasar untuk bisa menghambat perkembangan atau menurunkan populasi inokulum di lapangan. Penelitian ini bertujuan untuk menentukan pengaruh pH secara in vitro terhadap pertumbuhan patogen kanker batang dan laju penurunan viabilitas tubuh buah akibat penyimpanan. Kisaran pengaruh pH media meliputi 3, 4, 5, 6 dan 7. Penyimpanan tubuh buah dilakukan dalam wadah tanpa diberi tanah, diberi tanah steril dan tanah tidak steril. Penentuan viabilitas dilakukan pada 30, 60, 90 dan 120 hari masa penyimpanan. Semakin rendah pH menyebabkan pertumbuhan miselia terhambat.

Water Balance in Oil Palm Plantation with Ridge Terrace and Nephrolepis biserrata as Cover Crop Ariyanti, Mira; Yahya, Sudirman; Murtilaksono, Kukuh; Suwarto, Suwarto; Siregar, Hasril H.
Journal of Tropical Crop Science Vol 3 No 2 (2016): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

The existence of oil palm plantations as a possible cause of drought in the surrounding areas in Indonesia is a critical issue. Therefore, information related to the effects of oil palm plantations on the surrounding environment in terms of soil water content (SWC) availability is needed. Soil and water conservation techniques in the form of ridge terracing and cover crops, such as Nephrolepis biserrata, can be expected to potentially improve soil water reserves, especially in the dry-season, by accumulating water in the rainy season. This study aimed to study the effects of N. biserrata as cover crop, together with the potential effects of ridge terraces, on the water balance in mature oil palm plantations. The research was conducted in mature oil palm plantations, Afdeling III block 375 (planted in 1996) and block 415 (planted in 2005), Rejosari Unit, PT Perkebunan Nusantara (PTPN) VII in Natar District, South Lampung Regency, Indonesia, from August 2014 to January 2015. The research was based on of setting up 15 m x 20 m experimental plots with the following treatments: (i) without ridge terraces and without N. biserrata (G0T0); (ii) without ridge terraces but with N. biserrata (G0T1); (iii) with ridge terraces but without N. biserrata (G1T0); (iv) with ridge terraces and with N. biserrata (G1T1). Hydrology parameter data were collected for each treatment plot; water balance was calculated using a water balance equation. The results showed that the use of the cover crop N. biserrata in combination with ridge terraces helped improving SWC reserves by approximately 71% and 12%, respectively. The use of N. biserrata as a cover crop reduced the rate of water loss by percolation and run-off, by approximately 36% and 80%, respectively, in an area where the annual rainfall is above 2,400 mm per year. The presence of N. biserrata shortened the period of SWC deﬁcit by extending the period of a water surplus by 70 days when compared with ridge terracing alone (which reduced the period of SWC by 50 days).

The Roles of Asystasia gangetica (L.) T. Anderson and Ridge Terrace in Reducing Soil Erosion and Nutrient Losses in Oil Palm Plantation in South Lampung, Indonesia Asbur, Yenni; Yahya, Sudirman; Murtilaksono, Kukuh; Sudradjat, Sudradjat; Sutarta, Edy Sigit Sutarta Sigit
Journal of Tropical Crop Science Vol 3 No 2 (2016): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Asystasia gangetica (L.) T. Anderson is a weed commonly found on oil palm plantations and can be used as cover crop for mature oil palm plantations due to its tolerance to shading. The use of cover crop is a soil conservation technique to support sustainable availability of soil nutrients by reducing erosion and nutrients loss, particularly during the rainy seasons. This research aims to determine the roles of A. gangetica as cover crop for measures against erosion and nutrients loss in mature oil palm plantation. This research was conducted in oil palm plantation, Unit Rejosari, PT Perkebunan Nusantara (PTPN) VII, District of Natar, South Lampung Regency from August 2014 to April 2015. The research used split block design in randomized complete block design with two factors and six replications. The main plots were ridge terrace, namely with and without ridge terrace. The sub plots were cover crops, namely with and without cover crops A. gangetica. The results show that using A. gangetica as cover crops in mature oil palm plantations effectively minimized erosion and loss of organic C, N, P, and K by 95.7%, 93.4%, 96.0%, and 90.0 %, respectively. The use of cover crop became more effective when combined with ridge terrace and reduced erosion by 94.1% and loss of organic C, N, P and K by 99.1%, 99.2%, 90.0% and 98.5%, respectively.

Morphological Traits of Maluku Native Forest Clove (Syzygium aromaticum L. Merr & Perry) Mahulette, Asri Subkhan; Hariyadi, Hariyadi; Yahya, Sudirman; Wachjar, Ade; Alfian, Anggra
Journal of Tropical Crop Science Vol 6 No 02 (2019): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

A study was conducted to study the morphology of the forest cloves groups based on their sizes of their leaves, flowers, fruits and seeds, and to determine their potential yield and optimize their production system. The research was conducted for six months from January until June 2018 in Ambon, Maluku Province, Indonesia. The research used a random sampling technique to > 15-year-old trees in productive clove forest maintained by the local farmer in Ambon. The observation and recording was conducted at several stages of clover growth, namely bud sprouting, flower bud, blooming, perianths and anthers senescence, unripe green and ripe fruits. Different size groups of forest cloves have significant differences in the duration of flower and fruit formation. Forest cloves with large leaves, flowers, fruits and seeds had quicker ripening process than the othersize groups, but their fruits were longer to ripen. Flower from the medium size group had the shortest duration to develop its flower and form its fruit, whereas the smallest type took the longest time in fruit formation process but the duration of fruit ripening was similar to those from large morphology. Among the three different sizes of forest cloves in Maluku, the trees with large leaves, flowers, fruits and seeds group are the best to be commercially developed due to its earliest time to harvest and large flower sizes. Forest cloves are best harvested when the flowers are fully matured, indicated by one or two flower buds from one inflorescence have bloomed.

KULTUR POLIEMBRIONI BIJI DUKU (Lansium domesticum. CORR.) PADA MEDIA MS DAN WPM DENGAN PENAMBAHAN AIR KELAPA Prihatini, Retno; Yahya, Sudirman; Purwito, Agus
Sainstek : Jurnal Sains dan Teknologi Vol 2, No 1 (2010)
Publisher : IAIN Batusangkar

The study on growth respons of Lansium domesticum poliembryoni seed on MS and WPM media with added by coconut water had been carried out from Maret up to Mei 2006. This experiment had been done in Tissue Culture Laboratory, Agronomy-Holticulture Depatment, Agronomy Faculty, Institute Pertanian Bogor, using two factorial of Completely Randomized Design with nine treatments, and ten replications. The first factor treatment were MS, ½ MS and WPM media, and the 2nd factor were 0, 15 and 20% coconut water. The result showed that the emergence time of the first adventitious shoot were beginning on 26,5 days after planting, with one until four numerous of shoots, on MS, ½ MS, WPM media with added until 20% coconut water. There were only 50-70% shoot formed on 8 weeks after planting. With 20% coconut water suplemented on MS culture media showed that the height of shoots were significant than controle.Key words: Lansium domesticum, coconut water, polyembryonic seed, culture media.

Pertumbuhan Akar Kedelai pada Cekaman Aluminium, Kekeringan dan Cekaman Ganda Aluminium dan Kekeringan HANUM, CHAIRANI; MUGNISJAH, WAHYU Q.; YAHYA, SUDIRMAN; SOPANDY, DIDI; IDRIS, KOMARUDIN; SAHAR, ASMARLAILI
AGRITROP Vol. 26, No. 1 Maret 2007
Publisher : AGRITROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (304.954 KB)

The objective of this research was to study the change of vegetative growth of root on some genotypes soybeanof aluminium toxicity, drought stress, and double stress (Al toxicity and drought stress). Research in rooting systemof soybean is hoped to get more attention, especially for supporting concept of new plant type for high yieldingpotential. Six genotypes of soybean (Slamet, Sindoro, Dieng, Sinyonya, Lumut, and Wilis), treated with aluminiumsaturated (Al 25%, Al 50%, and Al 75%) and field capacity (80% FC and 40% FC). Response of growth vegetativeidentified perception by root dry weight. Result of the study show that only one from six that is genotype Wiliswas tolerant at aluminium toxicity, drought stress, and double stress.

Penggunaan Mikro Irradiasi Sinar Gamma untuk Meningkatkan Keragaman Genetik pada Varietas Kedelai Argomulyo [Glycine max (L) Merr] Hanafiah, Diana Sofia; Trikoesoemaningtyas, Trikoesoemaningtyas; Yahya, Sudirman; Wirnas, Desta
Jurnal Natur Indonesia Vol 14, No 1 (2011)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

This research used gamma ray irradiation on low doses (micro mutation). The aim of this research was to know the respons of doses level bymicro mutation on gamma ray irridation to the growing and development of Argomulyo variety of Glycine max (L) Merr (M1), the seeds isirradiated by gamma ray by micro mutation was 0 Gy, 50 Gy, 100 Gy, 150 Gy, and 200 Gy. Variation that obtained of each characters atgeneration M1 and M2 influences plants growth and development either through qualitative and quantitative that finally will influence plantsproduction. The average highest genetic variation at M 2 generation of soybean was on 200 Gy doses. Results of the research indicated thatgamma ray irradiation on 200 Gy doses was effective caused of plant variation genetic.

Analisis Pendapatan Usahatani Tumpangsari pada Peremajaan Kebun Kelapa Sawit Rakyat [Income Analysis Intercropping Farming System On Smallholder Oil Palm Replanting Area] Kusumawati, Sri Ambar; Yahya, Sudirman; Hariyadi, nfn; Mulatsih, Sri; Istina, Ida Nur
Buletin Palma Vol 20, No 1 (2019): Juni 2019
Publisher : Pusat Penelitian dan Pengembangan Perkebunan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/bp.v20n1.2019.45-56

The major problem rejuvenation on smallholder oil palm plantation is approximately three years loss of income, since the plants have not yet produced,. Loss of income for big companies does not affect of their survival, on the other hand, for smallholders (farmers,) it threatens the survival of the farmersâ€™ family. This study was aimed to analyze the income of intercropping system on smallholder oil palm replanting, carried out in Bukit Jaya Village Ukui Sub-District, Pelalawan Regency, Riau Province, on a replanted 28-year-old oil palm plantation. The experiment was arranged in a Split Plot Design with main plot is three farmerâ€™s units and subplot is four intercropped treatments (corn, soybeans, legume cover crops and natural vegetation) andÂ three replications. The results showed that corn productivities of planting season 1-3 consecutively were 5,01 t ha-1; 7,51 t ha-1and 6,57 t ha-1. Soybean were 1,60 t ha-1; 1,28 t ha-1 and 2,19 t ha-1. Production costs per ha were IDR. 11.550.000 for corn and IDR 9.955.000 for soybean. Farmer's income with local selling prices of corn, on average, was IDR. 3.280.623 Â per month per unit and soybean was IDR 636.518 Â per month per unit.Â The average R/C value of corn was 2,66 and soybean was 1,33.Â There was no significant effect of intercropping farming system treatments on the growth of oil palms trees for all of three farmers. The use of corn as intercropping provides benefits by obtaining the economic value of their crop yields, since corn was more profitable than soybean.ABSTRAKPermasalahan peremajaan kebun kelapa sawit adalah hilangnya pendapatan selama tanaman belum menghasilkan, kurang lebih tiga tahun. Kehilangan pendapatan bagi perusahaan besar tidak banyak berpengaruh pada perusahaan, namun bagi petani mengancam kelangsungan hidup keluarganya.Â Penelitian ini bertujuan menganalisis pendapatan usaha tani tumpangsari dan pertumbuhan tanaman pokok, dilaksanakan di Desa Bukit Jaya Kecamatan Ukui Kabupaten Pelalawan Provinsi Riau, pada kebun kelapa sawit 28 tahun yang diremajakan.Â Penelitian menggunakan Rancangan Petak Terbagi dengan petak utamanya kapling petani sebanyak tiga, anak petaknya perlakuan empat tanaman sela (jagung, kedelai, kacangan dan vegetasi alami), diulang tiga kali.Â Peubah amatan adalah pertumbuhan dan produk-tivitas jagung dan kedelai, biaya produksi, serta pertumbuhan tanaman pokok kelapa sawit.Â Data dianalisis meng-gunakan SAS versi 9,4 dan analisis kelayakan R/C rasio.Â Hasil penelitian menunjukkan produktivitas jagung musim tanam satu sampai tiga berturut-turut 5,01 t ha-1; 7,51 t ha-1 danÂ 6,57 t ha-1, atau rata-rata 6,36 t ha-1; kedelai 1,60 t ha-1; 1,28 t ha-1 dan 2,19 t ha-1 atau rata-rata 1,69 t ha-1. Biaya produksi jagung Rp. 11.550.000 per ha dan kedelai Rp. 9.955.000 per ha.Â Pendapatan petani rata-rata per bulan per kapling dengan harga jual jagung Rp. 4.350 per kg dan kedelai Rp. 7.000 per kg adalah jagung sebesar Rp. 3.280.623 dan kedelai Rp. 636.518.Â Rata-rata nilai R/C jagung 2,66 dan kedelai 1,33.Â Dibandingkan dengan praktek baku dengan tanaman kacangan, tidak ada pengaruh perlakuan tanaman sela terhadap pertumbuhan tanaman pokok kelapa sawit pada semua petani. Penanaman tanaman sela jagung pada lahan peremajaan kelapa sawit memberikan pendapatan yang lebih tinggi dibanding kedelai.Â ABSTRAKSalah satu permasalahan peremajaan kebun kelapa sawit rakyat adalah hilangnya pendapatan pekebun selama tanaman kelapa sawit belum menghasilkan, paling kurang tiga tahun.Â Penelitian ini menganalisisÂ pendapatan usaha tani tumpangsari pada peremajaan kebun kelapa sawit rakyat.Â Penelitian dilaksanakan di Desa Bukit Jaya Kecamatan Ukui Kabupaten Pelalawan Provinsi Riau, pada kebun kelapa sawit rakyat umur 28 tahun yang diremajakan.Â Penelitian menggunakan rancangan Split-Plot dengan petak utamanya kapling petani sebanyak tiga kapling, sebagai anak petaknya empat perlakuan tanaman tumpangsari yaitu jagung, kedelai, kacangan dan vegetasi alami, dan ulangan tiga kali.Â Peubah amatan adalah pertumbuhan dan produktivitas tanaman jagung dan kedelai, biaya produksi, serta pertumbuhan tanaman pokok kelapa sawit.Â Data dianalisis menggunakan SAS versi 9.4 dan analisis kelayakan R/C rasio. Â Hasil penelitian menunjukkan produktivitas jagung musim tanam satu sampai tiga berturut-turut 4,850 t ha-1; 7,503 t ha-1 danÂ 6,578 t ha-1, atau rata-rata 6,31 t ha-1;Â Â kedelai 1,603 t ha-1, 1,275 t ha-1 dan 2,193 t ha-1 atau rata-rata 1,69 t ha-1. Biaya produksi jagung Rp. 10.250.000,- per ha dan kedelai Rp 7.850.000,- per ha.Â Pendapatan petani rata-rata per ha per musim tanam dengan harga jual jagung Rp. 4.350,- per kg dan kedelai Rp. 7.000,- per kg adalah jagung sebesar Rp. 17.424.950,- dan kedelai Rp. 3.982.333,-.Â Rata-rata nilai R/C jagung 2,73 dan kedelai 1,51.Â Dibandingkan dengan praktek baku dengan tanaman kacangan, tidak ada pengaruh perlakuan tanaman sela pada pertumbuhan tanaman pokok kelapa sawit pada semua petani. Penanaman tanaman sela jagung pada lahan peremajaan kelapa sawit memberikan pendapatan yang lebih tinggi dibanding kedelai.

Co-Authors AA Sudharmawan, AA Ade Wachjar ADEEL ABDUL KARIM ALTUHAISH Agus Purwito Aiyen Tjoa Alfian, Anggra Amperawan Amperawan, Amperawan Andi Besse Poleuleng ASMARLAILI SAHAR Bari, Abdul Bofynna, Pio Agma Chairani Hanum Chairani Hanum Desta Wirnas Dharend Lingga Wibisana Diana Sofia Hanafiah DIDI SOPANDY Febbiyanti, Tri Rapani Febriani, Alda Haridjaja, Oteng Hariyadi Hariyadi Hariyadi, nfn Herdhata Agusta Hesti Pujiwati 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 , Rumiasih Saijo SANDRA ARIFIN AZIZ Simanjuntak, Hiskia Siregar, Hasril H. Sobir Sobir Sofiana, Yelli Sofyan Zaman Sri Mulatsih Sri Mulatsih Subandi, Subandi Sudradjat Sudradjat Suryo Wiyono Sutarta, Edy Sigit Sutarta Sigit Sutoro, Sutoro Suwarto Suwarto Suwarto Suyadi, Andri Tony Liwang Tri Rapani Febbiyanti, Tri Rapani Trikoesoemaningtyas Wahyu Hidayat WAHYU Q. MUGNISJAH Widodo Widodo Yani, Herman Yayat Hidayat Yenni Asbur Yoga Yuniadi

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