Adolf Pieter Lontoh, Adolf Pieter
Department Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University Jl. Meranti, Kampus IPB Darmaga, Bogor 16168, Indonesia

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Manajemen Pengendalian Gulma Tanaman Kelapa Sawit (Elaeis Guineensis Jacq.) di Kebun Aneka Persada, Riau Saputra, Yudha; Lontoh, Adolf Pieter
Buletin Agrohorti Vol 6, No 3 (2018): Buletin Agrohorti
Publisher : Departemen Agronomi dan Hortikultura

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Kegiatan penelitian dilaksanakan di Kebun Aneka Persada, Riau mulai 6 Februari 2017 sampai? 6 Juni 2017. Penelitian ini bertujuan meningkatkan kemampuan profesional, teknis, manajerial, dan analisis kegiatan di lapangan dengan melaksanakan kegiatan sesuai tahapan yang ada di lokasi penelitian. Pengamatan data primer yang dilakukan yaitu dominansi jenis gulma, metode pengendalian gulma, kondisi gulma dominan setelah semprot, metode pengendalian gulma yang digunakan, alat pelindung diri (APD), kondisi alat penyemprot, dan tenaga kerja. Hasil pengamatan pada 6 blok yang diamati menunjukkan bahwa vegetasi gulma yang dominan yaitu A. intrusa, D. ciliaris, B. alata, M.bracteata, dan C. lapacea. Asystasia intrusa mati setelah 3 MSA dengan herbisida berbahan aktif? Isopropilamina glifosat? 480 g l-1?+ Metil metsulfuron 20 % dosis masing-masing 115 ml ha-1?+ 4,5 g ha-1. Hasil uji yang dilakukan bahwa parameter flowrate, kecepatan jalan, dan prestasi kerja terdapat perbedaan yang sangat nyata, yang berarti bahwa penggunaan MHS lebih efektif dan efisien daripada penggunaan knapsack sprayer karena luasan semprot yang dapat dicakup menjadi lebih luas
Yield Evaluation of Selected Clones Apomictic Iles-Iles (Amorphophallus muelleri Blume) on Second Growing Period Lontoh, Adolf Pieter; Santosa, Edi; Kurniawati, Ani; Sari, and Maryati
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 47, No 2 (2019): Jurnal Agronomi Indonesia
Publisher : Indonesia Society of Agronomy

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Increasing corm production of iles-iles (Amorphophallus muelleri Blume) through genetic improvement is important for increasing farmers? income. However, the study on variety development is rarely reported. Here, yield evaluation of the second growing period was conducted at IPB Experimental Station Leuwikopo Farm, Bogor, Indonesia (-6.5647419, 106.7220331, 17.25z) from August 2017 to July 2018 in order to select candidate clone with high corm production. One-year-old corms of 21 F1 accessions were planted under 55% shading net with four replications. The parent population was set as a control. Results showed that accessions exhibited variation in corm size. The parent population produced corm ranged 622.3-908.3 g in weight (on average 764.2 g). The pooled accessions produced corm 180.7-1527.5 g in weight, corm diameter 71.0-145.8 mm, and corm height 46.6-87.6 mm. Nine accessions produced 5.91-99.88% higher average corms weight than the parent, i.e., BKB, BS, CF, CK, CR, DPG, DPP, SBM, and SHJ. Based on 30% as the basis of corm weight improvement, we concluded that five accessions, i.e., CK, CR, DPG, DPP, and SBM as prospective candidate clones. These accessions could be further evaluated in the third growing period to select best candidates of new variety of A. muelleri.Keywords: Agamosporous, Araceae, breeding strategy, new variety, productivity
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

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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

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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
Manipulasi Agronomi Bunga Iles-iles (Amorphophallus muelleri Blume) untuk Meningkatkan Produksi Biji Santosa, Edi; Kurniawati, Ani; Sari, Maryati; Lontoh, Adolf Pieter
Jurnal Ilmu Pertanian Indonesia Vol 21, No 2 (2016): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Corm of iles-iles (Amorphophallus muelleri Blume) is extracted for glucomannan production, a material that is widely used in medicinal, food, and beverage industries. Increasing demand on glucomannan promotes fast expansion of planting area in Indonesia, however, seed availability is limited. The objective of the experiment was to study corm age, planting distance, and planting depth in order to enhance seed production in A. muelleri. Two experiments were conducted under paranet of 65% in Leuwikopo Experimental Farm, Bogor Agricultural University (IPB) from June-November 2015. First experiment used 0- (bulbils), 1-, 2-, 3-, and 4-year-old corms. Second experiment used flowering 3-year-old corms, arranged by factorial of planting distance (0 ? 0 cm and 50 ? 50 cm) and planting depth (0 and 5 cm in depth). Results showed that flowering of A. muelleri was dependent on corm age, 96% of 3-year-old corms produced flower but none of the 1- and 4-years-old corms produced flower, whereas 8% of 2-year-old corms produced flower. Planting distance did not affect flower growth, while planting at a depth of 5 cm enhanced seed production. Present experiments imply that application of large 3-year-old corms, planting in dense population and at depth of 5 cm could enhance seed production of A. muelleri. It needs further investigation on seed quality from flowering of present treatments.
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 : Perhimpunan Hortikultura Indonesia dan Departemen Agronomi dan Hortiluktura

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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
Manajemen Pemetikan Tanaman Teh (Camelia Sinensis (L) O. Kuntze) di Unit Perkebunan Tambi, Wonosobo, Jawa Tengah Prastiwi, Ajeng Eka; Lontoh, Adolf Pieter
Buletin Agrohorti Vol 7, No 1 (2019): Buletin Agrohorti
Publisher : Departemen Agronomi dan Hortikultura

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Kegiatan penelitian di Unit Perkebunan Tambi bertujuan untuk meningkatkan kemampuan dan profesionalisme dalam proses kerja di lapang dan pengalaman teknis lapang pada tanaman teh serta menganalisis permasalahan yang terjadi di lapang. Tujuan khusus dari kegiatan penelitian adalah mempelajari manajemen pemetikan teh yang ada di Unit Perkebunan Tambi. Metode yang digunakan adalah metode langsung dan metode tidak langsung. Metode langsung dilaksanakan dengan mengikuti dan mengamati kegiatan teknis dalam budidaya teh di lapangan serta wawancara, sedangkan metode tidak langsung dilakukan dengan mengumpulkan data pendukung dari perusahaan berupa laporan manajemen, arsip kebun dan studi pustaka. Hasil pengamatan mandiri dari kegiatan penelitian pada aspek khusus pemetikan teh menunjukkan bahwa tinggi bidang petik, diameter bidang petik, tebal daun pemeliharaan, gilir petik, hanca petik, analisis pucuk, kapasitas petik, dan kebutuhan tenaga kerja sudah sesuai dengan standar dalam penerapan Good Agricultural Practices (GAP). Hasil analisis petik masih perlu perbaikan dalam kegiatan teknis pemetikan. Jenis klon Gambung 4 tumbuh optimal pada ketinggian 1000-1250 m dpl.
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

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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.
Kualitas Benih dan Pertumbuhan Bibit Tanaman Iles-Iles (Amorphophallus muelleri Blume) Asal Media Tumbuh Berbeda Sari, Maryati; Santosa, Edi; Lontoh, Adolf Pieter; Kurniawati, Ani
Jurnal Ilmu Pertanian Indonesia Vol 24, No 2 (2019): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Most of Amorphophallus muelleri seeds for corm production derives from natural production in the forest. The objective of research was to evaluate seed quality and seedling growth from natural and gibberellin (GA3)-induced flowering, and different growing media in order to develop seed production technology. The experiments were conducted at Leuwikopo Experimental Farm of Bogor Agricultural University, Bogor, Indonesia from August 2016-April 2017. A. muelleri seeds from six culture practices were compared, i.e., mother corms with natural flowering were planted in soil media, soil+rice husk charcoal, and soil+cow manure, and mother corms induced flowering using GA3 (1.000, 1.500, and 2000 ppm) were planted in soil media. Results indicated that berry size, color, seed color and size and seed germination rate were independent of seed production method, i.e., non-induction, GA3 induction, and growing media. Germination rate was >90%, and no abnormal sprouting was found. The highest seedling establishment, represented by full-expand of first leaf, was obtained from seeds of soil+rice husk charcoal media. Seedling from seeds of soil+rice husk charcoal and soil+cow manure media had larger leaves than the other treatments. Present study implies that application of rice husk charcoal or manure in the seed production of A. muelleri is important to obtain high quality seedling.
Manajemen Pemanenan Kelapa Sawit (Elaeis guineensis Jacq.) di Divisi 2 Bangun Koling Estate, Kotawaringin Timur, Kalimantan Tengah Kurniawan, Ilham; Lontoh, Adolf Pieter
Buletin Agrohorti Vol 6, No 1 (2018): Buletin Agrohorti
Publisher : Departemen Agronomi dan Hortikultura

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Kegiatan penelitian dilakukan di divisi 2 Bangun Koling Estate yang terletak di Desa Tumbang Koling, Kecamatan Cempaga Hulu, Kabupaten Kotawaringin Timur, Kalimantan Tengah dari bulan Februari hingga Juni 2016. Kegiatan penelitian dilaksanakan untuk meningkatkan pengetahuan, keterampilan kerja, menambah pengalaman serta mempelajari kegiatan budidaya kelapa sawit secara teknis dan manajerial. Pengamatan yang diamati meliputi angka kerapatan panen dan estimasi produksi, kebutuhan tenaga panen, kapasitas panen, alat panen dan alat pelindung diri, mutu buah, transportasi buah, dan kehilangan hasil. Hasil pengamatan yang telah dilakukan menunjukkan bahwa manajemen panen sudah berlangsung secara baik, tetapi perlu ditingkatkan agar didapatkan hasil yang optimal. Evaluasi yang harus dilakukan yaitu hasil taksasi belum menggambarkan hasil realisasi panen, penggunaan alat pelindung diri yang masih minim, kapasitas panen yang masih rendah dan masih terdapatnya losses di lapang.