Dwi Guntoro
Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor Kampus IPB Darmaga, Bogor 16680, Indonesia

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MANAJEMEN PENGENDALIAN GULMA PERKEBUNAN KELAPA SAWIT (ELAEIS GUINEENSIS JACQ.): ANALISIS FAKTOR- FAKTOR PENENTU DOMINANSI GULMA DI KEBUN DOLOK ILIR, SUMATERA UTARA Simangunsong, Yosua Pratama; Zaman, Sofyan; Guntoro, Dwi
Buletin Agrohorti Vol. 6 No. 2 (2018): Buletin Agrohorti
Publisher : Departemen Agronomi dan Hortikultura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (277.668 KB) | DOI: 10.29244/agrob.v6i2.18808

Abstract

 Kegiatan penelitian ini bertujuan untuk memperluas pengetahuan dan keterampilan tentang aspek teknis dan manajerial terutama dalam kegiatan manajemen pengendalian gulma. Kegiatan penelitian dilaksankan di Kebun Dolok Ilir, Sumatera Utara pada bulan Februari hingga Juni 2016. Analisis vegetasi pada 5 tahun tanam dengan mengambil 30 contoh pada setiap tahun tanam (TT). Pengamatan faktor iklim mikro dan tingkat kesuburuan dilakukan di kebun Cikabayan IPB. Pengamatan iklim mikro harian dilakukan 5 waktu yang berbeda .Faktor- faktor penentu dominansi gulma dianalisis secara korelasi terhadap NJD gulma yang dominan. Hasil uji faktor- faktor penentu dominasi gulma menunjukkan kegiatan pemupukan berkorelasi negatif pada tingkat dominansi A. aciculatus dan tanaman penutup tanah berkorelasi negatif terhadap tingkat dominansi D. ciliaris. Aspek edafik, dan iklim mikro tanaman kelapa sawit, tingkat dominansi gulma R. rundana berkorelasi negatif terhadap suhu udara, berkorelasi positif pada kandungan total unsur hara fosfor di dalam tanah. Tingkat dominansi gulma S. plicata berkorelasi positif terhadap kadar KTK tanah,  pH tanah. Tingkat dominansi gulma P.polystachion berkorelasi positif terhadap kadar kalium dalam tanah. Tingkat dominansi gulma O. nodosa yang mendominasi pada setiap daerah terbuka berkorelasi positif terhadap tingkat intensitas cahaya, dan berkorelasi negatif terhadap tingkat kelembapan.
AKTIVITAS HERBISIDA CAMPURAN BAHAN AKTIF CYHALOFOP-BUTYL DAN PENOXSULAM TERHADAP BEBERAPA JENIS GULMA PADI SAWAH Guntoro, Dwi; Fitri, Trisnani Yuda
Buletin Agrohorti Vol. 1 No. 1 (2013): Januari 2013
Publisher : Departemen Agronomi dan Hortikultura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (286.175 KB) | DOI: 10.29244/agrob.1.1.140-148

Abstract

Weed competition becomes a major problem in low land rice. Weeds can reduce rice production up to 60-70%. Mixing herbicides is expected to obtain a broader spectrum of control of the weeds. Inappropriate mixing herbicides may cause antagonism effect which can reduce the effectiveness on the target weed. The objective of the research was to study the antagonism activity of two active ingredients herbicide mixture, cyhalofop-butyl and penoxulam. The treatment was consisted of three types of herbicide with five level of doses, i.e. a single herbicide cyhalofop-butyl (0, 375, 750, 1500, and 3000 g ai ha-1), penoxulam (0, 50, 100, 200, and 400 g ai ha-1), and the mixture of cyhalofop- butyl 50 g L-1+ penoxulam 10 g L-1(0, 225, 450, 900, and 1800 g ai ha-1). The target weeds were Echinochloa cruss-galliand Monochoria vaginalis. Dry weight of biomass and percent of damage would further determine wheather the herbicide mixture were synergistic, antagonistic, or additive. Since cyhalofop-butyl and penoxulam had a different mode of action, analysis of the data used MSM (Multiplicative Survival Model) method to determine the LD50 of each herbicide treatment and mixture component. The result showed that an active ingredient mixture of cyhalofop-butyl 50 g L-1+ penoxulam 10 g L-1 was not antagonist, with LD50-expectation values of 253.231 g ai ha-1and the LD50-treatment of 211.91 g ai ha-1. The co-toxicity value was 1.19 (>1).Key words:  rice field weeds, cyhalofop-butyl, penoxulam, herbicide mixture, MSM (Multiplicative Survival Model), LD50
KELIMPAHAN VEGETASI DAN SIMPANAN BIJI GULMA PADA PERTANAMAN JAGUNG BERBEDA SEJARAH POLA TANAM DI LAHAN KERING Kefi, Andreas; Guntoro, Dwi; Santosa, Edi
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 48 No. 1 (2020): Jurnal Agronomi Indonesia
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.v48i1.28383

Abstract

Weed management is an important aspect in the dry land; however, weed resides in dry land like East Nusa Tenggara is rarely reported. The study aimed to evaluate weed species and its seed bank on maize fields from the different history of cropping patterns in order to develop effective weed control. The research was conducted in April-June 2019 at farmer fields at Kupang District, East Nusa Tenggara, Indonesia. Weeds were evaluated from four maize fields experienced a different history of cropping pattern (L1, L2, L3, and L4), and its seed bank from the depth of 0-10, 11-20, 21-30, and 31-40 cm were evaluated using seedling emergence method. The evaluation revealed 13 species at which 4 species exclusively were found in vegetation analysis, 2 species in the seed bank and 7 species in both vegetation and seed bank analysis. Dominant weed at podzolic L2 and L3 that experienced fallow for two months was Chloris barbata, while without fallow of podzolic L1 and grumusol L4 were Digitaria adscendens and Mazus japonicus, respectively. Cropping history and soil depths affected weed density, but depths of 0-20 cm had the highest density irrespective preceding the cropping pattern. Research implies both vegetation and seed bank analysis should be addressed and integrated in weed management. Keywords: dry land, fallow, weed management, East Nusa Tenggara, vegetation analysis
STUDI PERKECAMBAHAN BENIH CIPLUKAN (PHYSALIS PERUVIANA L.) PADA BEBERAPA TINGKAT MASAK BUAH Susanti, Norul Dewi; Widajati, Eny; Guntoro, Dwi
Buletin Agrohorti Vol. 7 No. 3 (2019): Buletin Agrohorti
Publisher : Departemen Agronomi dan Hortikultura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/agrob.v7i3.30173

Abstract

Ciplukan merupakan tanaman dengan banyak manfaat. Permintaan buah ciplukan yang meningkat menjadi peluang yang baik bagi petani. Masalah yang dihadapi petani adalah belum tersedianya benih bermutu. Informasi mengenai perkecambahan benih ciplukan masih sangat sedikit, sehingga perlu dilakukan pengembangan terhadap studi perkecambahan benih ciplukan. Penelitian ini bertujuan untuk menentukan metode pengujian daya berkecambah dan mengetahui pengaruh tingkat masak dan perlakuan benih sebelum pengecambahan pada perkecambahan benih ciplukan. Penelitian dilaksanakan di Laboratorium Ilmu dan Teknologi Benih IPB pada bulan Februari sampai dengan April 2019. Penelitian menggunakan rancangan kelompok lengkap teracak (RKLT) dua faktor. Faktor pertama yaitu tingkat masak benih yang diindikasikan oleh warna kelopak buah yaitu hijau kekuningan, kuning dan coklat. Faktor kedua adalah perlakuan sebelum pengecambahan yaitu tanpa perlakuan, perendaman benih dengan aquades dan perendaman dengan KNO3 0.2% selama 24 jam. Hasil penelitian menunjukan bahwa pengamatan daya berkecambah hitungan pertama adalah pada 14 HSP dan hitungan kedua pada 28 HSP. Berdasarkan pengamatan indeks vigor dan kecepatan tumbuh, panen benih terbaik dapat dilakukan ketika kelopak buah berwarna kuning hingga coklat. Perlakuan benih sebelum pengecambahan dengan KNO3 nyata meningkatkan daya berkecambah pada tingkat masak kuning.
INVIGORASI BENIH UNTUK MEMPERBAIKI PERKECAMBAHAN KACANG PANJANG (VIGNA UNGUICULATA HASK. SSP. SESQUIPEDALIS) PADA CEKAMAN SALINITAS Erinnovita, ,; Sari, Maryati; Guntoro, Dwi
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 36 No. 3 (2008): Jurnal Agronomi Indonesia
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 | Full PDF (59.047 KB) | DOI: 10.24831/jai.v36i3.1379

Abstract

The objective of this research was to study the influence of invigoration on yard-long bean seed germination under salinity stress. The research was conducted at Seed Science and Technology Laboratory, Department of Agronomy IPB from September to December 2007. Seed of two yard-long bean (Vigna unguiculata Hask. ssp. sesquipedalis) varieties, i.e. 777 and Landung Super, were used to investigate the effects of invigoration treatments, i.e. water soaking, sand priming, sawdust matriconditioning, osmoconditioning with CaCl2, NaCl, KCl and KNO3, under salinity 1.0% NaCl (w/v) stress condition. Sand priming and water soaking treatments significantly enhanced the germination percentage, speed of germination and dry matter of normal seedling under the salinity stress condition. Germination percentage of seed with sand priming was 33.33% higher than tgat of control, and germination percentage of seed with water soaking was 28.66% higher than that of control. The result  suggested that sand priming and water soaking were the effective methods to improve yard-long bean seed germination under salinity stress condition.   Key words: invigoration, salinity stress, sand priming, water soaking, yard-long bean   seed
PHOSPORUS SUFFICIENCY FOR GROWTH AND PRODUCTION OF SOYBEAN UNDER SATURATED SOIL CULTURE IN MINERAL AND PEATY SOILS: KECUKUPAN HARA FOSFOR PADA PERTUMBUHAN DAN PRODUKSI KEDELAI DENGAN BUDIDAYA JENUH AIR DI TANAH MINERAL DAN BERGAMBUT Bachtiar, Bachtiar; Ghulamahdi, Munif; Melati, Maya; Guntoro, Dwi; Sutandi, Atang
Jurnal Ilmu Tanah dan Lingkungan Vol 18 No 1 (2016): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (370.752 KB) | DOI: 10.29244/jitl.18.1.21-27

Abstract

The research objective is to determine the dosage and frequency of given of P fertilizer on soybean varieties in soil mineral and peaty mineral under saturated soil culture in tidal land. The research was conducted in mineral and peaty mineral soil of tidal area types B and C in the District of Tanjung Lago, Banyuasin Regency, Province of South Sumatra from April to August 2014. This study used split plots. Willis and Tanggamus varieties were main plots, application time (0, 0 and 4 MST) were on subplot, and fertilizer dose (0, 36, 72, 108 kg P2O5 ha-1) was on sub-sub plot. Experiment results showed that soybean productivity in peaty mineral soil was lower than mineral soil. In peaty mineral soil, the application time of phosphorus at 0 and 4 MST was able to increase growth and productivity of soybean, while phosphorus application time on mineral soils was better at 0 and 4 MST of planting time on mineral soils. The dose of 108 kg P2O5 ha-1 increased the productivity of soybean in peaty mineral soils, while a dose of 72 kg P2O5 ha-1 was better in mineral soil. In peaty mineral soil, interaction (Tanggamus, application at 0 and 4 MST as well as 72 kg P2O5 ha-1), showed the highest productivity of soybean (2.83 ton ha-1). Meanwhile, interaction (Tanggamus, application at 0 and 4 MST as well as 72 kg P2O5 ha-1) showed the highest productivity of soybean (3.8 ton ha-1), respectively in mineral soil under saturated soil culture techniques in tidal land.  Keywords: Dose of fertilizer, Glycine max (L) Merr., phosphorus, soil acidity, variety
UJL HASIL KEPRASAN BEBERAPA VARLETAS TEBU LAHAN KERING PADA DAERAH BERIKLIM BASAH Purwono, ,; Sudiatso, Sugeng; Guntoro, Dwi
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 25 No. 1 (1997): Buletin Agronomi
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 | Full PDF (785.513 KB) | DOI: 10.24831/jai.v25i1.1652

Abstract

The study of first rationed sugar cane on wet climate region was carried out at Sindangbarang Bogor (belong to type A according Schmidt and Fergusson classification) from October 1993 to April 1994. The study was designed to fined out the yield and total-sugar content. Several cultivar of Ps 87 (produced by P3GI) were tested (Ps 87-985, Ps 87-21718, Ps 87-22189, Ps 87-22704, Ps 87-21781, Ps 87-22098, Ps 87-21781, Ps 87-21067), and Ps 58 as a control. The result showed that the Ps 87-22074 produced the highest yield (19.524,7 g/m "juring") and total-sugar content (13,16%) among the other.
PENGARUH PENGGUNAAN PUPUK ANORGANIK DAN PUPUK SEMAI MIKROBIA TERHADAP PERTUMBUHAN DAN PRODUKSI KAPAS (GOSSYPIUM HIRSUTUM L.) Guntoro, Dwi; Chozin, M. A.; Dwirestina, Dini
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 32 No. 1 (2004): Buletin Agronomi
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 | Full PDF (624.459 KB) | DOI: 10.24831/jai.v32i1.1430

Abstract

effect of inorganic fertilizer dosage and concentration of Semai Mikrobia fertilizer on cotton growth and production was studied at Cikabayan greenhouse, IPR. The experiment was arranged in split plot design with three replicates. The dosages of inorganic fertilizers as the main plot and the concentration of Semai Mikrobia as sub plot. The dosages of inorganic fertilizers were no fertilizer, 50% recommended dosage, and IOO% recommended dosage and the concentrations of Semai Mikrobia were 0 cc/l water, 4 cc/l water, 8 cc/l water, and I2 cc/l water. The results indicated that the application of Semai Mikrobia fertilizer up to I2 cc/l did not affect growth and production of cotton. There was no interaction effect between the dosage of inorganic fertilizer and Semai Mikrobia concentration. Inorganic fertilizer application at IOO% recommended dosage increased height and the number of generative branch compared with no fertilizer.
PERBANDINGAN ARACHIS PINTOI DENGAN TANAMAN KACANG-KACANGAN PENUTUP TANAH LAIN DALAM MENEKAN LAJU EROSI PADA LAHAN KELAPA SAWIT BERBUKIT Sarjono, Arif; Guntoro, Dwi; Supijatno, dan
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 47 No. 1 (2019): Jurnal Agronomi Indonesia
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 | Full PDF (356.707 KB) | DOI: 10.24831/jai.v47i1.22891

Abstract

Land preparation of oil palm plantation in hilly areas is vulnerable to environmental degradation. Legume cover crops can be used in vegetation system for soil conservation to control erotion. Arachis pintoi is a legume potential for cover crop. The objective of the research was to study the role of A. pintoi in suppressing soil erosion rate in oil palm land with the topography of hilly land. The research was conducted on the land of Bukit Kemuning farmer group, Mersam, Batanghari, Jambi with an average slope of 22.8% from September 2017 to March 2018. The experimental design used was a single-factor randomized complete block design with five treatments and four replications. The treatment consisted of natural vegetation, Arachis pintoi, Centrosema pubescens, Pueraria javanica and Calopogonium mucunoides. The results showed that the rate of increased leaf number of A. pintoi was 13.6 pieces per week and could cover the ground surface 100% at 20 weeks after planting (WAP). The dry weight of A. pintoi biomass was 496.08 g m-2 at 20 WAP. A. pintoi suppressed soil erosion by 80.45% as compared to natural vegetation treatment. However, it was not significantly different on suppression rates to other biomulch treatments.Keywords: biomass, Calopogonium mucunoides, Centrosema pubescens, land cover crop, Pueraria javanica
EFIKASI HERBISIDA PENOKSULAM PADA BUDIDAYA PADI SAWAH PASANG SURUT UNTUK INTENSIFIKASI LAHAN SUBOPTIMAL Guntoro, Dwi; Agustina, Karlin; Yursida, Yursida
Jurnal Lahan Suboptimal : Journal of Suboptimal Lands Vol 2, No 2 (2013)
Publisher : Pusat Unggulan Riset Pengembangan Lahan Suboptimal (PUR-PLSO) Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (428.952 KB) | DOI: 10.33230/JLSO.2.2.2013.54

Abstract

An experiment on herbicide Penoksulam 25.5 g/L was conducted in tidal land. The objectives of this experiment was to determine the effectiveness of herbicides in controlling weeds in lowland rice. The experiment was conducted from November 2012 to March 2013. Randomized block design (RBD) with 6 treatments and 4 replications was used. The treatments tested the herbicide Penoksulam 25.5 g/L dose of 0.60 L/ha, 0.75 L/ha, 0.94 L/ha, 1,125 L/ha, manual weeding and control. The experimental unit was a plots measuring 5 m x 5 m. The results showed that the application of penoksulam 25.5 g/L  could to control weeds of lowland rice. Dominance weeds species in tidal land were Fimbristylis littoralis, Ludwigia octovalvis and Cyperus Iria. Application of herbicide at doses 0.60 L/ha up to 1.125 L/ha caused only mild symptoms of phytotoxicity on rice. Herbicides could be used to increase low land rice production on effective dose 0.60 L/ha to 0.75 L/ha.