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PENGARUH KONSENTRASI DAN SELANG WAKTU PEMBERIAN EFFECTIVE MICROORGANISMS 4 (EM-4) TERHADAP PERTUMBUHAN DAN HASIL TANAMAN KAPAS (Gossypium hirsutum L.) Arsyid, Moh. Amri; Chozin, M. A.; Zaman, Sofyan
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 26, No 1 (1998): Buletin Agronomi
Publisher : Bogor Agricultural University

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Abstract

The objective of this experiment is to study the effect of concentration and application interval of EM4 on growth and yield of cotton. The experiment was held in KP Sindangbarang Bogor from March to August 1996, using RCD with two factors and three replications. The first factor was EM4 concentration which were 0 ml L-1  water, 5 ml L-1  water, 10 ml L-1  water, 15 ml L-1  water, and 20 ml L-1  water. The second factor was application interval which were 5, 10, and 15 days. The result shows that the concentration of 5 ml L-1  water significantly affected the vegetative growth. But in the contrary, application interval and its interaction do not give the similar effect. The generative growth were significantly affected by concentration and application interval and its interaction. The best combination for maximum cotton yield is in concentration of 5 ml L-1 water and application interval 10 days, and for maximum seeded cotton yield is 5 ml L-1 water and 15 days.
Simpanan Biji Gulma dalam Tanah di Perkebunan Teh pada Berbagai Tahun Pangkas Santosa, Edi; Zaman, Sofyan; Puspitasari, Intan Dewi
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 37, No 1 (2009): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

Through understanding on seed bank, tea plantation manager enables to plan better weed control. The objective of the study was to identify seed bank of weeds at different ages of tea plantation after prunning. The study was conducted at Perkebunan Teh Tambaksari, Subang, Indonesia. Soil samples were collected from tea field of different pruning years (TP0-2 months after pruning, TP1-16 months after pruning, TP2- 28 months after pruning, and TP3-40 months after pruning) and then watered regularly and exposed to direct sunshine to stimulate propagule germination. Results showed that seed banks were found in all soil samples, indicated that effectiveness of weed control was low. The highest seed bank was found at TP1. Most seed bank was seed, they were Ageratum conyzoides which dominated field of TP0 (SDR 36.58%), TP1 (35.90%), TP2 (41.79%) and TP3 (24.82%), followed by Borreria latifolia with SDR values were 19.50%, 27.26%, 29.40% and 16.14%, respectively. Some species stored both vegetative and generative propagules such as Cyperus sp. and Cyperus cyperoides with SDR value 20.33 % only dominated at age of TP0. Seed bank at area of TP1 and TP2 had high value of community coefficient, i.e., 77.22%, showed both fields had high similarity. This finding implies that effective weed control increases when the control is conducted before the weeds bear seed, where mostly less than 45 days after emergence. Furthermore, thirteen weeds had no seed bank in the field, indicates that weed problem in tea plantation was composed of seed bank and weed propagules from other sites.   Key words:  Pruning year, seed bank, tea plantation, weed control
Produksi dan Kualitas Beras Dua Varietas Padi Akibat Rebah dan Terendam Dulbari, .; Santosa, Edi; Sulistyono, Eko; Agusta, Herdhata; Guntoro, Dwi; Zaman, Sofyan; Koesmaryono, Yonny
Jurnal Ilmu Pertanian Indonesia Vol 23, No 1 (2018): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Abstract

Rice lodging followed by flooding has negatively detriment on the production, however, scientific evident is still rare. As the incident tends to escalate as the impact of extreme weather, hence, research was conducted in order to evaluate rice production and its quality of two rice genotypes treated with lodging-flooding. The experiment was conducted at Leuwikopo Farm IPB Bogor in July-October 2016 using randomized complete block design using two factors, i.e., variety (Way Seputih and Way Apo Buru) and lodging (no lodged [bending 0-18°], lodged [lodged 38-56°], and lodged with flooded [lodged 76-90°]). Rice hill aged 85 days after transplanting was lodged for 15 days. Results showed that lodged with flooded treatment did not increase yield loss although the plant tended to have sterility 5.59-22.00% higher, grain weight 2.05-35.26% lower, and 0.88-10.66% lower value of rice to unhusked ratio. Grains from the lodged-flooded plant had a number of head rice 13.38-15.78% lower, broken rice 0-24.84% higher, and stimulated germination on 1.33-3.40% grains than lodged-without-flooded. It is important to use rice varieties with stable on milling quality to address the lodged-flooded incident.
Tree-based Water Footprint Assessment on Established Oil Palm Plantation in North Sumatera, Indonesia Santosa, Edi; Stefano, Indra Mario; Gani Tarigan, Abdul Gani; Wachjar, Ade; Zaman, Sofyan; Agusta, and Herdhata
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 46, No 1 (2018): Jurnal Agronomi Indonesia
Publisher : Indonesia Society of Agronomy

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Abstract

ABSTRACTIn a long life cycle of oil palm plantation, sustainable water management is mandatory because irrigation is rarely applied. In order to develop water management for sustainable palm oil production, tree-based water footprint of well-established oil palm plantation was assessed. Field data were collected from February to June 2016 in Dolok Ilir managed by PTPN IV, North Sumatera, Indonesia. Additional data were obtained from interviews on the site and the surrounding estates, reports and references. Results showed that water footprint (WF) for production of fresh fruit bunch (FFB) was 510.69 m3 tonne-1 and crude palm oil (CPO) was 517.79 m3 tonne-1. Green, blue and grey water contributed 94.78%, 0.71% and 4.50% in FFB, and 93.48%, 1.66% and 4.85% in CPO productions, respectively. All green WF was calculated basen on actual value of tree evapotranspiration, therefore, the value was mostly lower than other researchs. Low amount of blue water indicates that the oil palm tree in North Sumatera extracts low amount of ground water. On the other hand, grey water for pollution dilution of fertilizers, pesticides and herbicides were high, i.e., 15.15 m3, 4.77 m3, 3.07 m3 tonne-1 FFB, respectively. It implies that reduction of grey water should be implemented in the near future through precission farming.Keywords: CPO, Elaeis guineensis, precission farming, sustainable production, water footprint
Cocoa Production Stability in Relation to Changing Rainfall and Temperature in East Java, Indonesia Santosa, Edi; Sakti, Ginanjar Pramudya; Fattah, Muhamad Zainul; Zaman, Sofyan; Wahjar, Ade
Journal of Tropical Crop Science Vol 5 No 1 (2018): Journal of Tropical Crop Science - available online July 2018
Publisher : Journal of Tropical Crop Science

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Abstract

Climate change as indicated by rising temperature and changing rainfall pattern has been known to affect cacao production in many production countries. However, studies on the effects of rainfall and temperature variability on the cacao production are rarely reported in Indonesia. Hence, the objective of this study is to evaluate the stability of cocoa production in relation to rainfall and temperature variability in order to develop sustainable production under climate change scenario. Research was conducted at a state owned company in Jember District, East Java, Indonesia from February to June 2015. Production and climatic data of 2010-2015 were evaluated using simple regression and correlation analysis. Results revealed that productivity fluctuated among months and among years. However, the fluctuation among months (s2 = 117.076) was lower than among years (s2 = 311.225). Rainfall and temperature showed variability among months and among years; and the fluctuation among months was lower in both rainfall and temperature. Rainfall at one to four months before harvest correlated with production (r=0.400-0.671; P= 0.000 to 0.001) and temperature at two to four months before harvest determined cocoa production (r=0.371-0.412; P=0.001-0.003). High monthly cocoa production coincided with decreasing temperature and rainfall for 4 to 5 months during pod development. The presented study implies that both short and long term strategies should be implemented under climatic variability to sustain cocoa production. It is recommended to apply production technology to stabilize micro climate temperature and to minimize the impact of high rainfall such as shade plant and canopy manipulation.
Periode Kritis Pertumbuhan Kedelai Hitam (Glycine max (L.) Merr) dalam Berkompetisi dengan Gulma Gultom, Sandry; Zaman, Sofyan; Purnamawati, Heni
Buletin Agrohorti Vol 5, No 1 (2017): Buletin Agrohorti
Publisher : Departemen Agronomi dan Hortikultura

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Abstract

Periode kritis terhadap persaingan dengan gulma menjadi pertimbangan dalam menentukan kapan saat yang tepat untuk mengendalikan gulma dan tindakan yang tepat dilakukan untuk melakukan pengelolaan gulma. Percobaan dilaksanakan di Kebun Percobaan Sawah Baru, Institut Pertanian Bogor, Dramaga, Bogor dengan ketinggian tempat 209 meter diatas permukaan laut pada bulan April-Juli 2016. Rancangan lingkungan yang digunakan adalah rancangan kelompok lengkap teracak dengan 12 taraf perlakuan dengan tiga ulangan. Taraf perlakuan terdiri atas bersih gulma dan bergulma (0-2 MST, 0-4 MST, 0-6 MST, 0-8 MST, 0-10 MST, 0-panen). Penyiangan gulma dilakukan secara manual dan waktunya disesuaikan dengan perlakuan periode kompetisi gulma untuk setiap petak. Berdasarkan hasil penelitian, periode kritis kedelai hitam Mallika adalah 2-6 MST dengan kehilangan hasil panen dari awal tanam hingga panen diperoleh berkisar antara 23.61% hingga 83.54%.
Manajemen Pemupukan Kelapa Sawit di Sungai Bahaur Estate, Kalimantan Tengah Nunyai, Aslina Putri; Zaman, Sofyan; Yahya, Sudirman
Buletin Agrohorti Vol 4, No 2 (2016): Buletin Agrohorti
Publisher : Departemen Agronomi dan Hortikultura

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Abstract

Kebutuhan minyak nabati yang terus meningkat menyebabkan perlu adanya peningkatan kuantitas dan kualitas minyak nabati dunia. Elaeis guineensis Jacq. merupakan tanaman jenis palma penghasil minyak nabati terbanyak didunia. Kelapa sawit yang tumbuh optimal akan menghasilkan tandan buah yang segar dan minyak yang berkualitas. Budidaya yang tepat mempengaruhi hasil tandan buah segar (TBS) dan salah satu budidaya yang penting adalah pemupukan. Tujuan dilaksanakan kegiatan magang adalah untuk mempelajari kegiatan pengelolaan kebun mulai dari perawatan hingga panen yang dilakukan selama 4 bulan. Metode pelaksanaan magang terdiri dari aspek teknis dan manajerial. Aspek khusus pengamatan manajemen pemupukan konsep 4 tepat pemupukan (4T) yaitu tepat jenis, dosis, waktu, cara, dan tempat. Hasil pengamatan menunjukkan bahwa konsep tepat waktu belum terlaksana dengan baik dan masih perlu dilakukan upaya peningkatan kualitas tenaga kerja serta fasilitas yang lebih baik agar pelaksanaan pemupukan efektif dan efisien.
Pengelolaan Gulma Kelapa Sawit (Elaeis guineensis Jacq.) Studi Kasus di Kalimantan Selatan Nufvitarini, Winda; Zaman, Sofyan; Junaedi, Ahmad
Buletin Agrohorti Vol 4, No 1 (2016): Buletin Agrohorti
Publisher : Departemen Agronomi dan Hortikultura

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Abstract

Kegiatan bertujuan untuk mengetahui manajemen pengendalian gulma kelapa sawit. Kegiatan dilaksanakan dari bulan Februari sampai Juni 2011. Pengumpulan data dilakukan di Angsana Estate, Kalimantan Selatan. Metode tidak langsung dengan melakukan studi pustaka berupa literatur dan laporan kebun. Gulma berdaun lebar banyak mendominasi areal perkebunan. Perbandingan nilai koefisien komunitas gulma tiap tahun tanam tidak homogen, nilai C < 75%. Pengendalian gulma dilakukan di dua tempat yaitu di gawangan dan piringan, secara manual dan kimiawi. Pengendalian secara manual dilakukan pada tanaman yang masih muda (TBM) dan TM. Pengendalian secara kimiawi dengan menggunakan herbisida sistemik sesuai dengan pedoman prinsip dan kriteria kebun yang berkelanjutan dengan Block Spraying System (BSS). Tidak semua gulma di ASE dikendalikan, beberapa jenis gulma dipelihara untuk tujuan tertentu (beneficial plant) seperti menjaga kelembaban tanah, meningkatkan bahan organik dan nutrisi dalam tanah serta dapat mengatasi serangan hama. Beneficial plant tersebut antara lain Euphorbia heterophylla, Cassia cobanensis, Antigonon leptopus dan Turnera subulata.
Manajemen Panen Kelapa Sawit (Elaeis guineensis Jacq.) di Kebun Hatantiring, Kalimantan Tengah Situmorang, Antonio C; Zaman, Sofyan; Junaedi, Ahmad
Buletin Agrohorti Vol 4, No 1 (2016): Buletin Agrohorti
Publisher : Departemen Agronomi dan Hortikultura

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Abstract

Kegiatan magang memberikan ilmu dan keterampilan dalam budidaya kelapa sawit baik secara teknis maupun manajerial. Kegiatan magang dilaksanakan mulai bulan Februari hingga Juni 2014 di kebun Hatantiring, Kalimantan Tengah. Aspek pemanenan mencakup rotasi panen, taksasi produksi, sistem panen, pengawasan terhadap kehilangan hasil (losses), dan produktivitas. Pengamatan diuji dengan analisis uji t student dan analisis uji LSD. Berdasarkan analisis uji t diketahui bahwa rotasi panen terlambat akan menambah persentase brondolan sehingga peluang kehilangan hasil (losses) juga akan meningkat. Berdasarkan uji LSD pada pemeriksaan losses pertama dan kedua menunjukkan hasil signifikan begitu juga pada pemeriksaan kedua dan ketiga. Hal ini menunjukkan bahwa arahan dan pengawasan mampu meingkatkan kesadaran karyawan panen dalam menekan losses. Peningkatan produksi juga dapat dicapai dengan melakukan sistem panen yang lebih efektif dan efisien. Sistem panen DOL C1R2 dinilai lebih efektif dan efisien dari pada sistem panen DOL C1R1 karena output pemanen mengalami peningkatan. Hal ini berpengaruh terhadap bertambahnya pendapatan karyawan dan pengurangan jumlah karyawan.
Pengendalian Gulma Perkebunan Kelapa Sawit (Elaeis guineensis Jacq.) di Perkebunan Padang Halaban, Sumatera Utara Prasetyo, Hari; Zaman, Sofyan
Buletin Agrohorti Vol 4, No 1 (2016): Buletin Agrohorti
Publisher : Departemen Agronomi dan Hortikultura

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Abstract

Kegiatan magang berlangsung dari bulan Februari hingga Juni 2014 di Perkebunan Padang Halaban, Sumatera Utara. Pengamatan vegetasi gulma dilakukan dengan analisis vegetasi pada 4 blok dengan tahun tanam yang berbeda untuk mendapatkan nisbah jumlah dominansi (NJD) dan koefisien komunitas menggunakan indeks kesamaan Bray-Curtis. Gulma yang dominan pada 4 blok termasuk ke dalam golongan rumput. Keempat blok memiliki vegetasi gulma yang tidak homogen. Blok yang memiliki kesamaan vegetasi gulma terdekat hingga terjauh secara berurut adalah blok tanaman tahun ini, tanaman menghasilkan tua, TM muda dan tanaman belum menghasilkan. Biaya pengendalian gulma di pembibitan utama lebih tinggi dibandingkan pre nursery. Biaya pengendalian di TBM lebih tinggi dibandingkan TM.