Articles

Pola Peningkatan Hasil Ta naman Jarak Pagar (Jatropha curcas L.) Ekotipe Lombok Barat selama Empat Ta hun Siklus Produksi Santoso, Bambang Budi; Hariyadi, ,; Purwoko, Bambang Sapta
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 39, No 2 (2011): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

The aim of this experiment was to evaluate the pattern of yield improvement of Jatropha curcas L. of West Lombok ecotype at dry land of North Lombok, West Nusa Tenggara during four years production cycle.  The experiment was conducted in randomized complete block design (RCBD) using three types of propagules (i.e., stem cutting, seed, and seed followed by pruning after transplanting) and three replications from November 2006 to November 2010. The results showed that yield was increased as plant age increased. Plants cultivated during rainy season had higher yield compared to those cultivated during dry season.  However, the oil content of nuts was slightly higher when harvested in dry season than in rainy season.  Yield was also affected by plant material used.  In the first year, plants propagated by stem cutting had the highest yield.  In the second, third, and fourth year, plants propagated from seed followed by pruning produced the highest nut dry weight. During four years production cycle, yearly yield improvement was about 2-3 times than the previous year and did not follow the geometrical progression based on dichotomy branching pattern of Jatropha.   Keywords: dry land, productivity, pruning, seed oil content, type of propagule  
Perbanyakan Tunas Mikro pada Beberapa Umur Simpan Umbi dan Pembentukan Umbi Mikro Bawang Merah pada Dua Suhu Ruang Kultur Dinarti, Diny; Purwoko, Bambang Sapta; Purwito, Agus; Susila, Anas Dinurrohman
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 39, No 2 (2011): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

Shallot bulb generally stored for several month before planted in the field. Since explant age is one of important factors in tissue culture development, storage period of shallot bulb might alter the explant growth in vitro. Shoots of shallot formed in the in vitro culture should form bulbs before can be use as seedling, and temperature may affect micro bulb induction. Two experiments had been conducted to evaluate 1) the effect of storage period in the field on the growth of shallot explant in vitro and 2) the effect of culture room temperature in microbulbs induction of shallot. In the first experiment, shallot bulb had been stored for 1, 2, 3 and 4 months before used as explants. Storage period significantly influenced the explant growth in vitro. Bulb with 2 months storage gave the best performance on number of micro shoot, number of leaves and roots, and less of vitrification. Micro shoots on three weeks after planting (WAP) was feasible to use as propagule for shallot micro bulb induction. In the second experiment, shoots from propagation medium was transplanted to bulb induction medium and  grown in growth chamber with different temperatures (day/night) 20/17 oC and 30/27 oC, respectively.  Micro bulb induction was influenced by temperature. Lower temperature showed good results for number of leaves, length of leaves, number of roots, and length of roots. However, temperature of 30/27 oC gave the best result on number of micro bulb, diameter of bulb and bulb width:bulb disk diameter ratio.   Keywords: Allium, explants age, micro bulb,  temperature, 2ip
Pengaruh Pemangkasan Batang dan Cabang Primer terhadap Laju Fotosintesis dan Produksi Jarak Pagar (Jatropha curcas L.) Hariyadi, ,; Purwoko, Bambang Sapta; Raden, Ince
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 39, No 3 (2011): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

This research was aimed to study the effect of stem and primary branch prunning on photosynthetic rate and production of physic nut. The experiment was conducted in IPB experimental station in Cikabayan, Darmaga, Bogor, from February 2007 until May 2008. A randomized block design with one factor was used in the experiment.  The treatments were combination between stem pruning with various height from the soil surface and pruning of primary branches with various number of branch remained. Stem pruning on 40 cm above the soil surface with no branch pruning resulted in the highest photosynthetic rate (8.10 µmol CO2 m-2 s-1), while stem pruning on 20 cm above the soil surface with 2 primary branches remained resulted in the lowest photosynthetic rate (4.71 µmol CO2 m-2 s-1).  Stem pruning on 40 cm above the soil surface without branch pruning produced the highest yield components, i.e., capsul number (207.3 capsul plant-1), seed number (506 seeds plant-1) and  seed dry weight (323.81 g plant-1).   Keywords: photosynthetic rate, production, stem prunning
Pembungaan Jarak Pagar (Jatropha curcas L.) beberapa Ekotipe Nusa Te nggara Barat Santoso, Bambang Budi; Susanto, Slamet; Purwoko, Bambang Sapta
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 39, No 3 (2011): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

The flowering biology of physic nut (Jatropha curcas L.) has been observed in dry land (sandy entisol soil type) of Amor-Amor, North Lombok, West Nusa Tenggara. Exploration was conducted in several areas where high population of physic nut grown as fence plant was found. Quantitative, descriptive, and observation data were collected for each accession during two-year growth period. Randomized block design was used in this research with three replications from November 2006 until November 2008. Treatments consisted of five ecotypes, i.e. West Lombok, Central Lombok, East Lombok, Sumbawa, and Bima. The results showed that flowering of physic nut West Nusa Tenggara ecotypes was produced continuously during a year, while the peak number of flower was only twice e.g. at the early (November-February) and at the end (April–May) of rainy season. Duration of the flowering process took around 3 days for female flower, around 2 days for male flower, and 7-10 days for total flower per inflorescence. Higher genetic potential for female flower formation was found on West Lombok, Sumbawa, and Bima ecotype. This result should be useful information for breeding programme of physic nut. However, since physic nut is a perennial plant, further study is needed especially on the technology to control flowering.   Keywords: dry season, flowering, fruiting, rainy season,  
Peran Hara N, P dan K pada Pertumbuhan dan Perkembangan Ratun Lima Genotipe Padi Susilawati, ,; Purwoko, Bambang Sapta; Aswidinnoor, Hajrial; Santosa, Edi
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 40, No 3 (2012): JURNAL AGONOMI INDONESIA
Publisher : Bogor Agricultural University

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Abstract

The objective of the research was to determine the roles of fertilizers application in improving rice ratoons. Statistical design used was a factorial randomized complete block design with three replications. The first factor was three levels of fertilizer rate (kg ha-1) i.e. 5 N + 27 P2O5; 45 N + 30 K2O; and 27 P2O5+30 K2O. The second factor was rice genotypes, i.e. Cimelati, Hipa-5 and Rokan varieties, and two lines of rice i.e. IPB106-7-47-DJ-1 and IPB106-F-8-1. The growth and production characters of main crops and ratoon were observed. The results showed that both genotypes and rates of fertilizer affected yield of ratoon. Following application of (kg ha-1) 45 N + 27 P2O5 three genotypes produced the highest ratoon, i.e. IPB106-7-47-DJ-1 and IPB106-F-8-1 lines and Rokan variety. Cimelati and Hipa-5 varieties produced higher number of ratoon with fertilizer rate (kg ha-1) 45 N + 30 K2O. Ratoon production of all genotypes ranged 38.1-56.6% of the main crop. This study clearly demonstrated that N, P and K fertilizer had important roles in increasing yield and yield components of rice ratoon. Keywords: fertilizer, productivity, rice genotypes, rice ratoon
Deteksi Dini Toleransi Padi Hibrida terhadap Kekeringan menggunakan PEG 6000 Afa, La Ode; Purwoko, Bambang Sapta; Junaedi, Ahmad; Haridjaja, Oteng; Dewi, Iswari Saraswati
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 41, No 1 (2013): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

The objective of this study was to determine a selection method at early stage for drought tolerant hybrid rice. Theexperimental design was split plot with 3 replications. In the first experiment the main plot was concentration of PEG 6000consisting of control and concentration 25% of PEG 6000. The subplots were hybrid genotypes/varieties, i.e. BI485A/BP3,BI485A/BP5, BI485A/BP10, BI485A/BP12, BI485A/BP15, BI599A/BP5, BI599A/BP15, BI665A/BP6, Maro, Hipa 8, IR64and Limboto. In the second experiment the main plot was drought stress level which consisted of control and drought stressat 60% field capacity. The subplots were hybrid genotypes/varieties used in the first experiment. The results showed that PEG 6000 could be used to detect drought tolerant genotypes at early stage. Seedling dry weight was the major character for selecting drought tolerant genotypes. Genotypes BI485A/BP15 and BI559A/BP15 are tolerant to drought and can potentially be grown in rainfed lowland.Keywords: drought tolerant, early selection, hybrid rice, polyethylene glycol
Tingkat Produksi Ratun berdasarkan Tinggi Pemotongan Batang Padi Sawah Saat Panen Purwoko, Bambang Sapta; Aswidinnoor, Hajrial; Santosa, Edi
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 40, No 1 (2012): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

The objectives of the study was to determine the effect of cutting height of main crop on the yield of rice ratoon, and to select genotypes with high productivity on tidal swamp land. The method used was a factorial randomized block design with three replications. The first factor was cutting height of 10 cm, 20 cm and 30 cm from soil surface. The second factor was five genotypes selected from previous study, namely Cimelati, Hipa-5, Rokan, IPB106-7-47-DJ-1 and IPB106-F-8-1. The results showed that combination of genotypes and cutting height affected ratoon yield.  Cutting height of 20 cm increased the number of filled grain in almost all genotypes, increased growth rate of ratoon to 1.5 cm day-1  and increased growth uniformity of ratoon of Cimelati, Hipa-5 and Rokan geontypes, with production 3.0 ton ha-1, 2.8 ton ha-1 and 2.2 ton ha-1, equal with 57.2%, 60.1%, 52.7%, of the main crop respectively.  Cutting height of 10 cm above soil surface showed the best results for IPB106-7-47-DJ-1 and IPB106-F-8-1 genotypes, with the highest yield of ratoon 2.1 ton ha-1 and 1.5 ton ha-1, equal with 45.8% and 35.4%  of the main crop respectively. Keywords: cutting height, ratoon, yield
Karakter Morfologi dan Kimia Kultivar Pamelo (Citrus maxima(Burm.) Merr.) Berbiji dan Tanpa Biji Rahayu, Arifah; Susanto, Slamet; Purwoko, Bambang Sapta; Dewi, Iswari Saraswati
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 40, No 1 (2012): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

The objective of this study was to evaluate morphological and chemical characteristics of seeded and seedless pummel fruit. The study was carried out during April 2009 to July 2010. The pummelo fruits were harvested from the production center of Sumedang, Pati, Kudus, Magetan, Bireun (Aceh) and Pangkep (South Sulawesi). Some of seeded cultivars have spherical and ellipsoid form, while the seedless one shown pyriform shape. The edible portion of the fruits (juice vesicles) mainly affected by peel thickness and fruit shape. The edible portion of seedless cultivars (57.22%) were not sigificantly different with seeded (57.07%) and potentially seedless cultivars (59.35%). Generally fruit taste of seedless cultivars were sweet to sweet-bitter, meanwhile seeded and potentially seedless pummelo cultivars have sour-sweet. Pummelo juice taste was affected by TSS (total soluble solids), TA (titratable acidity), TSS/TA ratio and naringin content. Seedless pummelo cultivars have higher pH, TSS, TSS/TA ratio, vitamin C and naringin, but lower in TA content than seeded and potentially seedless fruit juice. ‘Jawa 1’ and ‘Bali Merah 2’ pummelos can be further developed as seedless superior cultivars. Keywords: fruit shape, edible portion, TSS/TA, naringin, vitamin C
Konstribusi Akumulasi Silikat, Nitrogen dan Aluminium terhadap Ketenggangan Aluminium dan Ketahanan terhadap Penyakit Blas pada Padi Gogo Bakhtiar, ,; Purwoko, Bambang Sapta; Trikoesoemaningtyas, ,; Dewi, Iswari Saraswati
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 37, No 3 (2009): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

Aluminum (Al) toxicity and blast disease are the most important yield-limiting factors for upland rice production in acid soils. The objective of this experiment was to examine the contribution of accumulation of Silicate (Si), Nitrogen (N) and Al in plant tissue on Al tolerance and blast disease resistance in upland rice. The experiment was arranged in a split-split plot design with 2 replications. Main plots were randomly assigned to blast treatment (control and inoculation to blast fungi). Subplots were assigned to control box (lime 1.5 AlEC) and another acid soils (no lime) box and sub-subplots were assigned to the tested genotypes. The result of the experiment showed that leaf blast disease resistance in rice cannot be solely explained by Si or N content in shoot tissue. The resistant to leaf blast disease might be attributed by high ratio Si/N weight in shoot. Al tolerance was ascribed by low reduction in root growth, high shoot dry weight, high Si content in shoot, and as well as high of  Si/Al ratio in root.   Key words:  Al-tolerance, blast disease, upland rice, Si/Al ratio
Respon Genotipe Padi Sawah terhadap Pemupukan Nitrogen Di Dataran Tinggi (Response of Rice Genotypes to Nitrogen Fertilizer in Highland) Limbongan, Yusuf La’lang; Purwoko, Bambang Sapta; Trikoesoemaningtyas, ,; Aswidinnoor, Hajrial
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 37, No 3 (2009): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

The objective of this experiment was to study the response of rice genotypes to nitrogen under low temperature stress condition.  This experiment was done at Sesean rural area, Tana Toraja Regency, South Sulawesi, 1500 m above sea level with mean temperature 18oC. Experiment was designed in Completely Randomized Block Design with two factors.  The first factor comprised of 3 levels of Nitrogen dosage (0, 50, and 100 kg N / ha) and the second factor was cultivar i.e. Pulu´ Mandoti, Pinjan, Lambau, Fatmawati, Sintanur and Gilirang.  The results showed that at low temperature stress condition, nitrogen, cultivar and their interaction gave significant effect on percentage of pollen fertility, percentage of filled spikelet and weight of filled grain per spikelet, while interaction between nitrogen and cultivar did not significantly affect the flag leaf length and flowering date. Rice yield decreased with increasing N levels under low temperature stress condition. There were significant positive correlations between growth components (percentage of pollen fertility, flag leaf length and flowering date) and yield components (number of tiller and grain per panicle and weight of 1000 grain).   Key words:  low temperature stress,  nitrogen fertilizer, rice, highland, pollen fertility
Co-Authors , Bakhtiar , Hariyadi , Hasnam , Susilawati , Trikoesoemaningtyas ,, Mawaddah ,, Usman . Djumali . Hariyadi AGUS PURWITO Agus Zainudin AHMAD JUNAEDI Akbar, Miftahur Rizqi Akbar, Miftahur Rizqi Akhmadi, Gerland Anas Dinurrohman Susila Anshori, Muhammad Fuad Ardie, dan Sintho Wahyuning Arifah Rahayu Atmitri Sisharmini Azmi, Yudia Bambang Budi Santoso Buang Abdullah Cucu Gunarsih Desta Wirnas Dewi, dan Iswari Saraswati Diny Dinarti DJUMALI DJUMALI, DJUMALI Edi Santosa Eko Sulistyono ,, Eko Sulistyono Guntoro, dan Dwi HAJRIAL ASWIDINNOOR HAPSOH HAPSOH Hariyadi Hariyadi Heni Safitri Heni Safitri I NYOMAN RAI I. H. Rahman Ince Raden Iswari S. Dewi Iswari Saraswati Dewi Iswari Saraswati Dewi Kartika Kirana Sangga Mara, Kartika Kirana Sangga La Ode Afa LATIFAH KOSIM DARUSMAN Limbongan, Yusuf La’lang Lopes Hornai, Ermelinda Maria MOHAMMAD CHOLID, MOHAMMAD MUHAMAD SYUKUR Muhammad Cholid Nindita, dan Anggi Nita Kartina, Nita Nurul Khumaida Oteng Haridjaja Purbokurniawan . Redy Gaswanto, Redy Reny Herawati ROEDHY POERWANTO Safitri, dan Heni Safitri, Heni Sintho Wahyuning Ardie Slamet Susanto SRI HENDRASTUTI HIDAYAT SUDIRMAN YAHYA Sugiyanta . Sugiyanta, dan Suhartini, dan Tintin Suwarno, dan Willy Bayuardi Syukur, dan Muhamad TEUKU MUHAMMAD HANAFIAH OELIM Titin Budi Wahyuti TRI JOKO SANTOSO Trijatmiko, dan Kurniawan Rudi Trikoesoemaningtyas, and Trikoesoemaningtyas, dan Willy Bayuardi Suwarno, Willy Bayuardi Wirnas, dan Desta Wirnas, dan Desta Yuni Widyastuti Yunus, dan Muhamad Yusuf La’lang Limbongan