Nobuo Sugiyama
Faculty of Agriculture, Tokyo University of Agriculture, Funako, Atsugi, Kanagawa 243-0034, Japan

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CANOPY ACHITECTURE, BIOMASS AND FRUIT PRODUCTION OF SOLANUM NIGRUM L. AS DETERMINED BY NITROGEN APPLICATION Santosa, Edi; Putriantari, Marcella; Nakano, Hajime; Mine, Yoko; Sugiyama, Nobuo
Jurnal Hortikultura Indonesia Vol. 8 No. 3 (2017): Jurnal Hortikultura Indonesia
Publisher : Indonesian Society for Horticulture / Department of Agronomy and Horticulture

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (378.118 KB) | DOI: 10.29244/jhi.8.3.162-170

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ABSTRACT Demand on fruits of Leunca (Solanum nigrum L.) is increasing in Indonesia due to a rapid expansion of ethnic restaurants, especially Sundanese restaurants. Most fruits come from semi-intensive cultivation in intercropping system, leading to low productivity. In order to improve productivity, nitrogen experiment was carried out at field of Leuwikopo Farm of Bogor Agricultural University, Bogor-Indonesia, during rainy season from December 2013 to April 2014. Four levels of nitrogen, i.e., 0, 60, 120, and 180 kg N ha-1, were arranged in a randomized complete block design with four replicates. The results revealed that canopy architecture, dry matter and fruit production, and fruit quality were highly affected by nitrogen application. Increasing nitrogen levels increased biomass and fruit production. Plants treated with nitrogen at level of 60 kg ha-1 produced ideal height for local labor and stable weekly fruit production than other levels. Hence, N fertilizer is essential for achieving high productivity of S. nigrum.Keywords: canopy shape, fruit load, indigenous vegetable, leunca, ranti kebo ABSTRAK Permintaan buah Leunca (Solanum nigrum L.) terus meningkat di Indonesia sejalan dengan perkembangan restoran etnis khususnya restoran Sunda. Sebagian besar buah leunca berasal dari tanaman sampingan secara tumpangsari, sehingga produktivitas rendah. Dalam rangka meningkatkan produktivitas, percobaan pemberian nitrogen dilakukan di Kebun Percobaan Leuwikopo IPB, Bogor pada musim hujan Desember 2013 sampai April 2014. Nitrogen diberikan empat taraf yaitu 0, 60, 120, dan 180 kg N ha-1, yang disusun dalam rancangan acak kelompok dengan empat ulangan. Hasil menunjukkan bahwa bentuk kanopi, produksi bahan kering dan produksi buah serta kualitas buah dipengaruhi oleh pemberian nitrogen. Peningkatan dosis nitrogen meningkatkan bahan kering dan produksi buah. Tanaman dengan perlakuan 60 kg N ha-1 menghasilkan tinggi yang ideal bagi pemanen, dan hasil mingguan yang stabil dibandingkan dengan taraf yang lebih besar. Oleh karena itu, pemupukan nitrogen penting dilakukan untuk meningkatkan produktivitas leunca.Kata kunci: beban buah, bentuk kanopi, leunca, ranti kebo, sayuran tradisional
FLOWER DEVELOPMENT AND ITS IMPLICATION FOR SEED PRODUCTION ON AMORPHOPHALLUS MUELLERI BLUME (ARACEAE) Santosa, Edi; Lontoh, Adolf Pieter; Kurniawati, Ani; Sari, Maryarti; Sugiyama, Nobuo
Jurnal Hortikultura Indonesia Vol. 7 No. 2 (2016): Jurnal Hortikultura Indonesia
Publisher : Indonesian Society for Horticulture / Department of Agronomy and Horticulture

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (524.06 KB) | DOI: 10.29244/jhi.7.2.65-74

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ABSTRACTThere are many studies on agronomic and economic advantages of iles-iles (Amorphophallus muelleri Blume), leading to high demand on seed to support the rapid production expansion in many Asian countries. By contrast, there are few studies on flowering phenology and flower morphology although they affect the seed production. Therefore, we evaluated flowering phenology and flower morphology of 80 plants of A. muelleri grown in a field under 65% artificial shading net at Leuwikopo Experimental Farm IPB Darmaga, Bogor, Indonesia from May 2015 to July 2016 in order to improve seed production. A. muelleri produced solitary spadix, with female flowers at the lower part and male flowers at the upper part. Spadix grew slowly for 56-71 days after bud break, and then grew rapidly thereafter for 30-35 days until anthesis. Seed was harvested 9.6 to 10.2 months after anthesis. We devided the development of spadix into seven phases, bud break as stage I and berry maturity as stage VII. Stage VI to VII determined seed production. Seed production was also affected by roots formation and spadix size. There were strong positive correlations between lengths of the female zones with berry production. Some morphological characteristics of spadix were dependent on corm size, thus, it was likely that agronomic improvement to enhance female flower and corm sizes wasimportant in seed production.Keywords: developmental stage, female flower, iles-iles, male flower, seed production ABSTRAKTelah banyak kajian keunggulan agronomi dan ekonomi iles-iles (Amorphophallus muelleri Blume), sehingga mendorong peningkatan permintaan benih untuk mendukung perluasan areal produksi di banyak negara Asia. Namun demikian, kajian fenologi dan morfologi bunga khususnya terkait produksi benih masih terbatas. Oleh karena itu, kami mengkaji perkembangan dan morfologi 80 bunga iles-iles yang ditanam di bawah paranet 65% di Kebun Percobaan Leuwikopo IPB, Bogor, Indonesia dari Mei 2015 sampai Juli 2016 dalam rangka perbaikan produksi benih. Iles-iles menghasilkan sebuah tongkol bunga dengan bunga betina pada bagian bawah dan bunga jantan pada bagian atas. Tongkol bunga tumbuh lambat 58-71 hari setelah pecah tunas, diikuti tumbuh cepat 30-35 hari hingga antesis, dan biji dipanen 9.6 sampai 10.2 bulan setelahnya. Perkembangan bunga dari pecah tunas hingga buah matang dapat dibagi menjadi tujuh tahap. Tahap VI ke tahap VII menentukan keberhasilan produksi biji iles-iles. Selain itu, keberhasilan produksi biji juga dipengaruhi oleh keberadaan akar dan ukuran tongkol khususnya panjang bagian bunga betina. Beberapa karakter morfologi bunga iles-iles dipengaruhi oleh ukuran umbi saat tanam. Oleh karena itu, perlu perbaikan agronomis untuk meningkatkan ukuran umbi dan ukuran bunga betina guna mendukung produksi benih.Kata kunci: bunga betina, bunga jantan, iles-iles, produksi benih, tahap pertumbuhan
WE INVESTIGATED THE EFFECT OF SECTOR (POSITION IN CANOPY) ON TRANSLOCATION AND DISTRIBUTION OF 13C-PHOTOSYNTHATES IN  MANGOSTEEN TREES AND RELATED THE FINDINGS TO PREVIOUS ANALYSES OF FRUIT QUALITY. OUR EXPERIMENT WAS CONDUCTED ON THREE 25-YEAR-OLD MANGOSTEEN TREES. TREE CANOPIES WERE DIVIDED INTO 9 SECTORS BASED ON HEIGHT (BOTTOM, MIDDLE, TOP) AND WIDTH (INNER, CENTER, OUTER). ONE BRANCH FROM EACH SECTOR WAS LABELED WITH 13CO2 IN DECEMBER 2003. IMMEDIATELY AFTER LABELING, 13C CONCENTRATION IN Setiawan, Eko; Poerwanto, Roedhy; Fukuda, Fumio; Sugiyama, Nobuo; Saitoh, Kuniyuki; Kubota, Naohiro
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 40 No. 2 (2012): 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.v40i2.6375

Abstract

We investigated the effect of sector (position in canopy) on translocation and distribution of 13C-photosynthates in  mangosteen trees and related the findings to previous analyses of fruit quality. Our experiment was conducted on three 25-year-old mangosteen trees. Tree canopies were divided into 9 sectors based on height (bottom, middle, top) and width (inner, center, outer). One branch from each sector was labeled with 13CO2 in December 2003. Immediately after labeling, 13C concentration in leaves from middle sectors was higher than that in leaves from other positions. 13C concentration in all leaves decreased rapidly for 24 h after 13C feeding, followed by a gradual decrease. In contrast, 13C concentration increased over time in the pericarp and aril of fruits. Translocation of 13C-photosynthates into fruit was high in Sectors 4 and 5, and in top positions (Sectors 7 to 9). At 96 h after 13C feeding, the highest distribution ratio of 13C-photosynthates was observed in stems, followed in descending order by pericarp, leaf, and aril. 13C distribution ratio in the aril was generally highest in fruits from inner and center positions. The relationship between partitioning of photosynthates and quality of mangosteen fruit, which differs among sectors, has been discussed. Keywords: fruiting positions, Garcinia mangostanaL., photosynthate partitioning, 13C, tree branches
AGRONOMY, UTILIZATION AND ECONOMICS OF INDIGENOUS VEGETABLES IN WEST JAVA, INDONESIA Santosa, Edi; Prawati, Utami; Sobir, ,; Mine, Yoko; Sugiyama, Nobuo
Jurnal Hortikultura Indonesia Vol. 6 No. 3 (2015): Jurnal Hortikultura Indonesia
Publisher : Indonesian Society for Horticulture / Department of Agronomy and Horticulture

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (290.929 KB) | DOI: 10.29244/jhi.6.3.125-134

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ABSTRACTIndigenous vegetables have become popular in recent Indonesian diet, but agronomic and economic studies on these crops are limited. The objective of this research was to investigate the cultural technique of indigenous vegetables, their uses and economic importance in West Java, Indonesia. Initial market observation was conducted in Bogor to determine the economic value of indigenous vegetables. In depth observations of the indigenous vegetables and interviews with merchants, farmers and consumers were conducted in three districts, i.e., Bogor, Cianjur and Tasikmalaya, focusing on four indigenous vegetables familiar to local people, i.e., genjer (Limnocharis flava (L.) Buchenau), kenikir (Cosmos caudatus Kunth.), leunca (Solanum americanum Miller) and poh-pohan (Pilea melastomoides (Poir.) Wedd.). This study showed that indigenous vegetables have been produced in extensive and semi-intensive cultivations and are sold in local markets daily, although local people do not consume them frequently. Indigenous vegetables held a market share of less than 5% at local markets, and accounted for less than 10% in household vegetable consumption. The reasons for consumers to choose indigenous vegetables were familiarity to these crops, moderate prices, family members? preference, availability and ease of preparation. Generally, younger family members (<30 years old) bought indigenous vegetables less frequently than older ones (>30 years old), possibly due to lack of information on its use, unfamiliar flavor and high availability of other commercial vegetables commonly grown worldwide.Keywords: Cosmos caudatus, Limnocharis flava, local knowledge, Pilea melastomoides, Solanum americanumABSTRAKPopularitas sayuran indigenus terus meningkat di Indonesia, namun studi agronomi dan ekonominya masih terbatas. Penelitian bertujuan mengkaji budidaya, pemanfaatan dan nilai ekonomis sayuran indigenus di Jawa Barat, Indonesia. Penelitian pendahuluan dilakukan di pasar di wilayah Bogor. Penelitian mendalam dilakukan dengan mewawancarai pedagang, petani dan konsumen, serta mengamati di lahan petani di tiga kabupaten yakni Bogor, Cianjur dan Tasikmalayauntuk empat sayuran indigenus utama yakni genjer (Limnocharis flava (L.) Buchenau), kenikir (Cosmos caudatus Kunth.), leunca (Solanum americanum Miller) dan poh-pohan (Pilea melastomoides (Poir.) Wedd.). Studi menunjukkan bahwa sayuran indigenus diproduksi secara intensif dan semi intensif, serta dijual di pasar setiap hari, walaupun penduduk setempat tidak mengkonsumsi secara teratur. Sayuran indigenus mengisi celung pasar kurang dari 5% dan memenuhi kurang dari 10% kebutuhan sayuran rumah tangga. Konsumen memilih sayuran indigenus karena sudah terbiasa mengkonsumsi, harga terjangkau, disukai anggota keluarga,ketersediaan dan kemudahan mengolah. Secara umum, anggota keluarga muda (usia < 30 tahun) lebih jarang membeli sayuran indigenus dibanding yang lebih tua (usia > 30 tahun), kemungkinandisebabkan keterbatasan informasi nilai guna, adanya aroma asing, dan ketersediaan sayuran lain.Kata kunci: Cosmos caudatus, Limnocharis flava, pengetahuan lokal, Pilea melastomoides, Solanum americanum
GAMMA IRRADIATION ON GROWTH AND DEVELOPMENT OF AMORPHOPHALLUS MUELLERI BLUME. Santosa, Edi; Pramono, Sigit; Mine, Yoko; Sugiyama, Nobuo
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 42 No. 2 (2014): 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 (306.399 KB) | DOI: 10.24831/jai.v42i2.8428

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ABSTRACT Iles-iles (Amorphophallus muelleri Blume) produces apomictic seeds lead to low genetic variation. In order to induce genetic variation, germinated seeds were exposed to Gamma irradiation (Co-60) at doses of 10 to 100 Gy. Seed irradiation was conducted at Center for the Application of Isotope and Irradiation Technology -National Nuclear Energy Agency (CAIRT), Indonesia. Morphology and yield of M1 generation were observed. Results showed that irradiation at a dose of 10 Gy close to LD50 with survival rate 56%. Gamma irradiation at a dose of 10 Gy delayed seeds germination.  Germination rates gradually increased and reached maximum at 4 weeks after planting (WAP) for control plants, and 14 WAP of irradiated plants. At 16 WAP, germination rate of 10 Gy irradiated plants was 56% and 84% for those of control plants. Irradiation induced chimera as indicated by short petiole, variegated and abnornal shape of leaflets. Some irradiated plants entered dormancy at 8-10 weeks later than control ones. Prolong vegetative periode lead the plants to produce heavier corms. This study revealed the possibility to induce variation of A. muelleri by using gamma irradition. Keywords: Amorphophallus muelleri, gamma irradiation (Co-60), morphological variation, mutation breeding
KNO 3 APPLICATION AFFECT GROWTH AND PRODUCTION OF AMORPHOPHALLUS MUELLERI BLUME Santosa, Edi; Halimah, Siti; Susila, Anas D.; Lonto, Adolf P.; Mine, Yoko; Sugiyama, Nobuo
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 41 No. 3 (2013): 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 (310.866 KB) | DOI: 10.24831/jai.v41i3.8101

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ABSTRAKPemberian larutan KNO3 diduga dapat meningkatkan produktivitas tanaman iles-iles (Amorphophallus muelleriBlume). Penelitian bertujuan mempelajari pengaruh pemberian larutan KNO terhadap produktivitas A. muelleri. Umbiutuh umur satu tahun dengan bobot 100-125 g ditanam dalam polibag yang ditempatkan di bawah naungan paranet 50%pada musim hujan (September 2010-April 2011) di Bogor, Indonesia. Lima taraf larutan KNO3 yaitu 0, 2, 4, 6 dan 8% (b/v)diberikan melalui daun dan melalui tanah. Larutan diberikan 2 kali sebulan mulai 12 minggu setelah tanam (MST). Hasilmenunjukkan bahwa pemberian KNO3-13 nyata mempengaruhi pertumbuhan tanaman, khususnya meningkatkan jumlah daundan memperpanjang masa vegetatif. Pemberian KNO pada taraf 4% memberikan pengaruh tertinggi jika diberikan melaluidaun. Pemberian KNO33 taraf 4% memberikan pertumbuhan yang lebih tinggi jika diberikan melalui daun dibandingkanmelalui tanah. Secara umum, tidak ada pengaruh nyata pada pertumbuhan tanaman akibat pemberian dosis KNO yangdiberikan melalui tanah. Penelitian berimplikasi bahwa pemberian pupuk KNO melalui daun pada taraf 4% dapatditingkatkan efektivitasnya jika kerusakan pada anak daun dapat diminimalkan. Kerusakan daun cenderung meningkat padadaun tua, oleh karena itu, studi lanjut perlu dilakukan terkait waktu aplikasi yang tepat.Kata kunci: iles-iles, kalium nitrat, pupuk daun, pertumbuhan vegetatif
INVASIVE WEEDS IN BOGOR BOTANIC GARDENS, INDONESIA AND ITS IMPLICATION ON SURROUNDING LANDSCAPES Santosa, Edi; Widiyanto, Gunar; Lontoh, Adolf Pieter; Agustin, Elly Kristiati; Takahata, Ken; Mine, Yoko; Sugiyama, Nobuo
Buletin Kebun Raya Vol 17, No 2 (2014): Buletin Kebun Raya Vol. 17 (2) July 2014
Publisher : Center for Plant Conservation Bogor Botanic Garden, Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar

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Conservation areas with the objective for collection and exchange plant materials have been speculated as weed bank for surrounding areas. Objective of this study was to identify and characterize ruderal invasive weeds in the Bogor Botanic Gardens (BBG). Observations were conducted in all vak (collection blocks) in the BBG in order to identify the weeds species, determine their invasiveness, dominance and distribution. Weeds associations with host plants were observed. Current weed control program and data of dead trees collection were analyzed in relevant to weed. Distribution of weeds outside BBG was observed by transects method following river and road directions. Results showed that there were seven invasive weeds, i.e., Cecropia adenopus (Cecropiaceae), Cissus nodosa Blume (Vitaceae), Cissus sicyoides Blume (Vitaceae), Dioscorea bulbifera L. (Dioscoreaceae), Ficus elastica Roxb. (Moraceae), Mikania micrantha H.B.K. (Asteraceae) and Paraserianthes falcataria (L.) Nielsen (Fabaceae). These seven weeds species invaded 41 out of 215 plant families in BBG. Six species of weeds, i.e., C. adenopus, C. nodosa Blume., C. sicyoides Blume., D. bulbifera L., M. micrantha H.B.K. and P. falcataria (L.) Nielsen, were introduced as BBG collections for the first time while the F. elastica Roxb was considered as native. It is most likely that the weeds dispersal agents are the wind, birds, bats, visitors, and waters. All of these weeds existed in surrounding areas outside BBG. Given the detrimental impact of invasive weeds on the plant collection in BBG, it is necessary to develop long–term comprehensive control measures both inside and neighboring areas by involving other government authorities beyond BBG.
NPK FERTILIZERS FOR ELEPHANT FOOT YAM (AMORPHOPHALLUS PAEONIIFOLIUS (DENNST.) NICOLSON) INTERCROPPED WITH COFFEE TREES Santosa, Edi; Susila, Anas Dinurrohman; Lontoh, Adolf Pieter; Noguchi, Arisa; Takahata, Ken; Sugiyama, Nobuo
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 43 No. 3 (2015): 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 (724.124 KB) | DOI: 10.24831/jai.v43i3.11253

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ABSTRACTFertilizer application in elephant foot yams (Amorphophallus paeoniifolius (Dennst.) Nicolson) intercropping system is rare in Indonesia, therefore, NPK fertilizers experiment was conducted under the shade of 10-year-old coffee plantation at Leuwikopo Experimental Farm, Bogor, Indonesia, in order to increase the productivity of elephant foot yam intercropped with coffee trees. Prior to planting, 20 ton ha-1 of goat manure was applied. Four NPK combinations, i.e., N, P2O5, K2O at the rate of 0, 0 and 0; 100, 60 and 80; 125, 60 and 100; and 150, 60 and 120 kg ha-1, were applied. Results showed that there were no significant differences in leaf number per plant, petiole size and rachis length among treatments. Application of NPK decreased photosynthetic rates, while increasing rate of N and K2O had no effect on photosynthetic rates. NPK application at the 100 N, 60 P2O5 and 80 K2O kg ha-1 (N100P60K80 treatment) or larger prolonged growth duration regardless of NPK levels, and there was a close relationship between corm yield and growth duration. As a result, corm fresh mass was higher in the 100:60:80 kg ha-1 treatment than in control. In the N125P60K100 and N150P60K120 kg ha-1 treatments, leaves were damaged by heavy rains and winds, counteracting beneficial effect of NPK on growth duration and corm yield. These results suggested the importance of delay of entering dormancy for an increase in productivity of A. paeoniifolius.Keywords: NPK fertilizers, photosynthesis, productivity, prolong growth, tuber crop
NPK Levels and Application Methods on Productivity of Amorphophallus muelleri Blume in Intercropping System Santosa, Edi; Susila, Anas Dinurrohman; Lontoh, Adolf Pieter; Mine, Yoko; Sugiyama, Nobuo
Jurnal Jamu Indonesia Vol 1 No 2 (2016): Jurnal Jamu Indonesia
Publisher : Pusat Studi Biofarmaka Tropika LPPM IPB; Tropical Biopharmaca Research Center - Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1100.514 KB) | DOI: 10.29244/jji.v1i2.12

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Underground corm of Amorphophallus muelleri Blume contained glucomannan, a raw material widely used in beverage, food and medicinal industries. In Indonesia, A. muelleri is grown under intercropping system, however, average corm production was considered low. The low productivity could be related to the low input of chemical fertilizers. Therefore, the effects of NPK fertilizers and methods of application on A. muelleri productivity were evaluated in the present study for intercropping system. Two experiments were conducted at Leuwikopo Experimental Farm, Bogor, Indonesia from 2010-2012 under canopy of coffee trees. First experiment was conducted using four levels of N, P, and K applications, i.e., N:P2O5:K2O at the rate 0:0:0, 100:60:80, 125:60:100 and 150:60:120 kg ha-1. In second experiment, N:P2O5:K2O fertilizers at the rate of 100:60:80 were applied by conventional (solid) and liquefied. Results of first experiment showed that application of N, P and K at rate of 100 kg, 60 kg, and 80 kg ha-1 produced fresh corm weight 636.3±91.7 g per plant or increased by 63% higher than control. However, higher rate of NPK application did not increase corm yield, possibly due to the occurrence of leaf discoloration. Higher rates of NPK also delayed harvest time 1 to 2 weeks compared with control and caused wide variation of corm size. Thus, excess application of NPK should be avoided for high productivity of A. muelleri. Second experiment showed that there was no significant different among methods of application on fresh corm weight, i.e., 413 g and 396 g from conventional and liquefied applications, respectively. These experiments conclude that application of NPK is important to enhance A. muelleri production in intercropping system.
GROWTH AND PRODUCTION OF AMORPHOPHALLUS PAEONIIFOLIUS DENNST. NICOLSON FROM DIFFERENT CORM WEIGHTS Santosa, Edi; Sugiyama, Nobuo
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 35 No. 2 (2007): 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 (54.976 KB) | DOI: 10.24831/jai.v35i2.1315

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The effect of different seed corm weight on the growth and production of elephant foot yams (Amorphophallus paeonifolius Dennst. Nicolson) were studied. Two forms of corm with same weight were prepared, i.e., whole corm and vertically sectioned by 1/2. The fresh mass of each whole corm and corm section was the same. Six different corm weights were compared, i.e., 50, 100, 200, 500, 1000 and 2000 g. Growth and development of  elephant foot yam were determined by corm weigth, large seed corm produced larger leaf and fresh mass of daughter corms. On the contrary, number of leaf decreased with increasing seed corm weight. Plants from whole seed corms emerged earlier and they were larger than those from the sectioned corms, irrespective of weight. Plants from small sized whole corm emerged earlier than the larger ones. Dissecting the main bud caused the development of lateral buds, resulted in a delay of leaf emergence. The lower yield obtained by the use of sections might be related to the late emergence leading to shorter vegetative period in the field. In the cultivation, it is recommended to use whole seed corms of 100 or 200 g.   Key words :  Elephant foot yams, tuber crop, Araceae, corm weight, tuberization rate