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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  
Pengaruh Alelopati Jarak Pagar (Jatropha curcas L.) terhadap Perkecambahan Benih Jagung, Tomat dan Padi Gogo Raden, Ince; Purwoko, Bambang S.; Santosa, Edi; Hariyadi, ,; Ghulamahdi, Munif
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 36, No 1 (2008): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

  The objective of this research was to evaluate the effect of extract of leaves, seed and root of physic nut on the germination of corn, tomato, and upland rice. Research was conducted by using Complete Randomized Block Design with two factors, i.e., plant organ (leaves, seed and root) and species (corn, tomato and upland rice). The results showed that extract of 36 g dried organ/200 ml water (0.18 g/ml water) affected seed germination of corn, tomato, and upland rice. Extract of leaves tended to reduce percentage of corn seed germination (55.30% vs 70.68%), and extract of root to reduce germination of tomato and upland rice, 52.70% and 68.67%, compared to control 76% and 84%, respectively.   Key words:  Plant organ extract, physic nut, germination  
Karakteristik Daun Jarak Pagar (Jatropha curcas L.) dan Hubungannya dengan Fotosintesis Raden, Ince; Purwoko, Bambang S.; Hariyadi, ,; Ghulamahdi, Munif; Santosa, Edi
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 36, No 2 (2008): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

The objective of this research was to study the morphology and physiology of jatropha leaves and its relation to photosynthesis. Research was conducted using Randomized Complete Block Design with single factor,  i.e., leaf ages at the canopy with ten replications. The results showed that jatropha had phyllotaxy 5/13 with  angular divergence 1380. In early growing leaf enlarged sharply and then constant after 9 week, remaining green for 14 weeks.  Chlorophyll a, b, and total achieved maximum at 9 week, i.e., 0.45 g/cm2, 0.19 g/cm2, and 0.62 g/cm2, respectively. Photosynthesic rate was maximum at 6 week, i.e., 8.99 µmol/m2/s, while number of  stomata was maximum at 9 week (289.47 mm2). This finding implies that leaf number 11 to 13 or age 6 week after emergence could be used as reference for photosynthetic evaluation.   Key words:  Jatropha curcas L., leaf arrangement, photosynthetic, reference leaf
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
Evaluasi Beberapa Ekotipe Jarak Pagar (Jatropha curcas L.) untuk Toleransi Cekaman Kekeringan Lapanjang, Iskandar; Purwoko, Bambang S.; Hariyadi, ,; Budi R, Sri Wilarso; Melati, Maya
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 36, No 3 (2008): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

Drought stress in crop  occurs due to imbalance between water supply and demand.  Crop responses to drought stress  depend on their ecotypes.  This study was aimed at examining the tolerance of the physic nut ecotype to drought stress in inceptisol. This study was conducted at Silviculture greenhouse, Forestry Faculty IPB, from September to December 2007. A Completely Randomized Design with two factors was used in the experiment, i.e. water content (80, 60, and 40 % of field capacity) and physic nut ecotypes (Palu, NTB, IP-A, and IP-P) The results showed that (1) drought reduced stem diameter (31.4%), root length (65.49%) and leaf area (72.73%), and decreased plant dry weight (74.83%),(2) tolerance level of the evaluated physic nuts on the drought stress were moderate tolerance (IP-1A, NTB,  Palu) and sensitive (IP- Pakuwon).   Key words:  physic nut, drought stress, tolerance
Pengaruh Tinggi Pangkasan Batang Utama dan Jumlah Cabang Primer yang Dipelihara terhadap Produksi Minyak Jarak Pagar (Jatropha curcas L.) Raden, Ince; Purwoko, Bambang S.; Hariyadi, ,; Ghulamahdi, Munif; Santosa, Edi
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 37, No 2 (2009): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

The objective of this research was to study shoot architecture in relation to growth, increase production and seed oil content through various stem pruning and number of primary branches. This research was conducted using Randomized Complete Block Design with single factor. It consisted of ten treatments, i.e., K=kontrol, T20= height of stem pruning at 20 cm from soil and without control on number of primary branches, T20-2=height of stem pruning at 20 cm from soil and two primary branches, T20-3= height of stem pruning at 20 cm and three primary branches, T30= height of stem pruning at 30 cm and without control on number of primary branches, T30-2= height of stem pruning at 30 cm and two primary branches, T30-3=height of stem pruning 30 cm and three primary branches, T40=height of stem pruning at 40 cm and without control on number of  primary branches, T40-2=height of stem pruning at 40 cm and two primary branches, and T40-3=height of stem pruning 40 cm and three primary branches. The results showed that stem pruning increased number of primary branches. The highest seed oil content and seed production was achieved T40 and T30-3 treatments i.e., 323.81 g/plant or 0.810 ton/ha and 320.61 g/plant or 0.802 ton/ha with seed oil yield 244.56 kg/ha and 276.61 kg/ha, respectively.   Key words : Jatropha curcas L., seed oil content, pruning, primary branches
PENGARUH LIMBAH SAGU DAN PEMUPUKAN N, P DAN K TERHADAP PERTUMBUHAN BIBIT ALBIZIA (Paraserianthes falcataria L. Nielse) Hariyadi, ,; Argasasmita, M.; Arifin, Z.
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 22, No 1 (1994): Buletin Agronomi
Publisher : Bogor Agricultural University

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Abstract

This experiment was carried out at Cikarawang Research Station, IPB from February to July, 1992. The aim of this experiment was to study the effect of sago waste and N, P, K fertilizers on growth of albizia seedling. This experiment was arranged with Randomized Complete Block Design. There were two factors involved i.e. four different media based on the composition of topsoil and sago waste (0, 25, 50 and 70 %),´ and three rates of N; P, K fertilizer. The medium consisted of topsoil and 25 % of sago waste tended to give better seedling growth than the others. Fertilization treatments did not affect seedling growth.
Potensi Hasil Jarak Pagar (Jatropha curcas L.) pada Satu Tahun Budidaya di Lahan Kering Lombok Barat, Nusa Tenggara Barat Santoso, Bambang B.; Hasnam, ,; Hariyadi, ,; Susanto, Slamet; Purwoko, Bambang S.
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 36, No 2 (2008): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

Productivity of Physic Nut (Jatropha curcas L.) depends on environment and culture intensity. We evaluated yield potential of Jatropha curcas L. at dry land (sandy entisol soil type) of West Lombok, West Nusa Tenggara using three types of propagules, i.e., stem cutting, seed, and seed after pruning and were designed with Randomized Block Design in three replications during November 2006 until November 2007. Result showed that productivity of nut is 880.78 kg/ha (352.31 g/plant) from stem cutting, 749.81 kg/ha (299.92 g/plant) from seed, and 484.11 kg/ha (193.64 g/plant) from seed followed by pruning after 2 weeks planting.   Key words:  Productivity, pruning, seed,  stem cutting,  type of propagule
PENGARUH JENIS SETEK DAN MEDIA PEMBIBITAN TERHADAP PERTUMBUHAN BIBIT TANAMAN LADA (Piper nigrum L.) Hariyadi, ,; Darmawan, I.; Zaubin, R.
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 24, No 1 (1996): Buletin Agronomi
Publisher : Bogor Agricultural University

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Abstract

The experiment was carried out at green house of Medicinal and Spice Plant Research Agency, Bogor from May to October 1993. The split plot design in randomized block design was applied for 2 factors and 3 replication. The main plot was 2 kind of bud (secondary branch bud and tertiary branch bud), and the sub plot was 5 different growth media consisted of sand + cow dung + top soil mixed i.e. 1 : 1 : 0 : 1 : 1 : 1 : 1 : 1 : 2 : 1 : 1 : 3 and 1 : 1 4.The kind of bud did not significantly influence the pepper seedling growth. The best seedling shoot growth was obtained by the combination treatments of sand + cow dung + top soil (1 : 1 : 0), and the best seedling root growth was obtained by the combination of sand + cow dung + top soil (1 : 1 : 2
Perbanyakan Vegetatif Tanaman Jarak Pagar (Jatropha curcas L.) dengan Stek Batang: Pengaruh Panjang dan Diameter Stek Santoso, Bambang Budi; Hasnam, ,; Hariyadi, ,; Susanto, Slamet; Purwoko, Bambang Sapta
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 36, No 3 (2008): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

Since physic nut (Jatropha curcas L.) is heterozygous, sexual propagation results in great genotypic and phenotypic variability. Development of efficient techniques for asexual propagation would benefit the nursery industry as this would lead to selection and production of particular clones with desirable characteristics. Therefore, two following studies were conducted from September until December 2007.  The objective was develop a protocol for vegetative propagation of physic nut by stem cutting in different size of cutting. The first experiment was dealt with stem cutting length (20 cm, 25 cm, and 30 cm) at the same size of diameter (2.5-3.0 cm), and the second experiment was dealt with diameter of stem cutting (3 cm, 2.5-2.9 cm, 2.0-2.4 cm, and 1.5-1.9 cm) at the same size of length (30 cm). Each of experiment was designed in Completely Randomized Design with three replications. Each experimental unit consisted of 25 seedlings. The result showed that cutting growth varied depending on length and diameter of stem cutting. However, better seedling growth and better survival of young plant of physic nut can be obtained from stem cutting with 20-30 cm in length and stem cutting with 2.0-2.9 cm in diameter.   Key words: cutting diameter, cutting length, Jatropha, survival, transplanting