Articles

Current Research Status of Allelopathy JUNAEDI, AHMAD; CHOZIN, MUHAMMAD AHMAD; KIM, KWANG HO
HAYATI Journal of Biosciences Vol 13, No 2 (2006): June 2006
Publisher : Bogor Agricultural University, Indonesia

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Abstract

The term of allelopathy refers to chemical interactions (inhibitory or stimulatory) between plants, between plants and microorganisms, and between microorganisms. The wealth of information on the processes, procedures, and practices of allelopathy has contributed to understanding this field of science. Recently, researches of allelopathy have been conducted in laboratory, greenhouse, and field with multifaceted standpoint in some concerning area: (i) allelochemicals identifications and screening test; (ii) ecological and physiological aspects of allelopathy; (iii) genetic studies and the possibilities of using plant breeding or genetic manipulation to enhance allelopathic varieties; (iv) the use of allelopathic potential in the biological control, including as natural pesticide, of weeds and plant diseases as eco-friendly approach for sustainable agriculture scheme. Key words: Allelochemicals, biological control, sustainable agriculture
Yield Stability and Adaptability of Aromatic New Plant Type (NPT) Rice Lines Lestari, Angelita Puji; Abdullah, Buang; Junaedi, Ahmad; Aswidinnoor, Hajrial
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 38, No 3 (2010): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

Aromatic new plant type (NPT) rice lines were selected to obtain high yielding and aromatic lines. The objectives of the research were to study the yield stability and adaptability of 35 NPT rice lines across different environment, with Ciherang and Sintanur as check varieties. The lines planted at two locations, Bogor and Pusakanagara in two seasons (2009 dry and wet seasons, DS-WS). The experiment used  randomized complete block design (RCBD), with three replications. The 21-day-old seedlings were planted with spacing of 20 cm x 20 cm, with a plot size of 2 m x 5 m. Yield stability and adaptability were estimated by using coefficient regression (bi) and general mean of yield by Finlay-Wilkinson method. Combined analysis of variance showed that lines (G), environment (E), and the G x E interaction were significantly different. Lines showed different stability and adaptability. Several lines yielded higher than Ciherang variety. Nine lines were classified as stable and widely adapted at the marginal environment, i.e IPB 116-F-3-1, IPB 117-F-4-1, IPB-117-F-14-2, IPB-117-F-15-2, IPB-117-F-17-5, IPB 140-F-1-1, 140-F-IPB, 2-1, IPB 140-F-3, and IPB 149-F-2. Lines IPB 113-F-2, IPB 140-F-4, IPB 140-F-6, IPB 140-F-7, and B11738-MR-Si-1-2-1-2 were not stable and adapted only in optimum environmental condition (bi > 1) while IPB 116-F-46-1, IPB-117-F 17-4, IPB-117-F 18-3 and B11955-MR-84-1-4 has the value of bi < 1 or adaptable to marginal environments.   Keywords:  NPT rice, aromatic rice, yield stability
Respon Agronomi Varietas Padi terhadap Periode Kekeringan pada Sistem Sawah Tubur, Herman Wafom; Chozin, Muhamad Achmad; Santosa, Edi; Junaedi, Ahmad
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 this experiment was to identify the growth and production of rice varieties as responses to drought period in low land rice system. Rice plants were grown under plastic house in plots separated by massive walls. Drought periods were treated as main plots, i.e. water was supplied during 3, 6, and 9 weeks after rice transplanting, and control (cultivation without drought treatment). Rice varieties were used as sub plots, consisted of IR64 and Ciherang (low land improved varieties), IPB-3S (new plant type), Menthik Wangi (an aromatic local low land rice), Rokan (a hybrid rice), Way Apo Buru (amphibian type), Jatiluhur and Silugonggo (up land type). Our results showed that drought periods suppressed plant height, tiller number, spikelets length, weight of 1,000 grains, shoot dry weight and harvest index, and increased number of empty spikelets. Interaction between drought periods and rice varieties significantly affected productive tiller number, percentage of plants to flower, and grain weight per hill. Jatiluhur, Ciherang and Way Apo Buru still gave relatively high yields under drought stress indicated that those varieties were relatively tolerant to drought stress; Silugonggo and IPB-3S had medium tolerance to drought stress; IR64, Menthik Wangi and Rokan were the most sensitive varieties. Keywords: drought stress, drought tolerant, improved variety, local variety
Respon Agronomi Varietas Padi terhadap Periode Kekeringan pada Sistem Sawah Tubur, Herman Wafom; Chozin, Muhamad Achmad; Santosa, Edi; Junaedi, Ahmad
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 this experiment was to identify the growth and production of rice varieties as responses to drought period in low land rice system. Rice plants were grown under plastic house in plots separated by massive walls. Drought periods were treated as main plots, i.e. water was supplied during 3, 6, and 9 weeks after rice transplanting, and control (cultivation without drought treatment). Rice varieties were used as sub plots, consisted of IR64 and Ciherang (low land improved varieties), IPB-3S (new plant type), Menthik Wangi (an aromatic local low land rice), Rokan (a hybrid rice), Way Apo Buru (amphibian type), Jatiluhur and Silugonggo (up land type). Our results showed that drought periods suppressed plant height, tiller number, spikelets length, weight of 1,000 grains, shoot dry weight and harvest index, and increased number of empty spikelets. Interaction between drought periods and rice varieties significantly affected productive tiller number, percentage of plants to flower, and grain weight per hill. Jatiluhur, Ciherang and Way Apo Buru still gave relatively high yields under drought stress indicated that those varieties were relatively tolerant to drought stress; Silugonggo and IPB-3S had medium tolerance to drought stress; IR64, Menthik Wangi and Rokan were the most sensitive varieties. Keywords: drought stress, drought tolerant, improved variety, local variety
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
Evaluasi Konsumsi Air Beberapa Genotipe Padi untuk Potensi Efisiensi Penggunaan Air Chozin, Muhammad Ahmad; Sopandie, Didy; Junaedi, Ahmad; Lubis, Iskandar
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 40, No 1 (2012): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Abstract

Water use efficient varieties in rice may have good opportunity in term of economic value and scarcity of water.  This study was conducted to determine water consumption among rice genotypes that conventionally cultivated as low land (IR64, IPB97-F-15, Ciherang, Mentik Wangi, and Rokan hybrid), up land (Jatiluhur, Silugonggo), and amphibian type (Way Apo Buru, that could be planted both as lowland and up land). Rice seedlings at 14 days old were transplanted in a plastic container containing 83 kg of air dried soil, 1 plant per whole and 6 plants per container. The experiment was conducted in a vinyl house, using randomized complete block design with three replications. During rice growth, water table was maintained at 2 cm above soil surface, and water was added and recorded weekly. The results showed that varieties reveal production components and yield were different significantly. Water consumptions among varieties were significantly different, ranged from 15.93 L plant-1  for IR64 to 24.13 L plant-1  for Jatiluhur, or equal with 3,639 to 4,827 m3  ha-1. Jatiluhur was the most efficient variety in using water. This finding may guide us to explore benefit of water use efficient variety as sustainable option in water management of rice cultivation. Keywords: paddy rice, water management, water use efficiency
PENGARUH PENGGUNAAN PUPUK HAYATI TERHADAP PERTUMBUHAN TANAMAN BELUM MENGHASlLKAN (TBM I) KOPI ROBUSTA (Coffea canephora Pierre ex Froehner) Junaedi, Ahmad; Wachjar, Ade; Rahman, Achirul
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 27, No 2 (1999): Buletin Agronomi
Publisher : Bogor Agricultural University

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Abstract

This experiment was aimed to study the effect of biofertilizer on growth of young Robusta coffee. New planting of Robusta coffee BP 42 x BP 358 was used with Randomized Complete Block Design and 3 replications. Treatments were fertilization as follows : P1 (20 g EMAS + 50 % recognized dosage of inorganic fertilizer (d.a.p.a.)), P2 (10 ml EM 4 + 50 % d.a.p.a.), P3 j (25 g OST + 50 % d.a.p.a.), P4 (5 kg manure + 50 % d a.p.a.) and P5 (d.a.p.a., 23 g Urea, 28 g SP36 and 16 g KCI). The results showed that sum couple, length and sum node of plagiotrophic stems were significantly different from 2 till 6 month after treatment, but it were not significantly different for height and stem diameter: Manure + 50 % d.a.p.a. was the best responses for all variables. EMAS + 50 % d.a.p.a. and EM 4 + 50 % d.a.p.a. had responses as good as inorganic fertilizer: Whereas, OST+ 50 % d.a.p.a. had the lowest responses for all variables.
PENINGKATAN HASIL BELAJAR FISIKA TEKNOLOGI MELALUI PEMBELAJARAN KOOPERATIF TIPE TEAM ASSISTED INDIVIDUALIZATION DI KELAS XI-AV SEMESTER GENAP SMK FUTUHIYYAH MRANGGEN DEMAK Junaedi, Ahmad; Huda, Choirul
Jurnal Penelitian Pembelajaran Fisika Vol 1, No 2/september (2010): JP2F
Publisher : Jurnal Penelitian Pembelajaran Fisika

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Abstract

Keberhasilan belajar siswa pada mata pelajaran Fisika teknologicukup rendah, padahal Fisika Teknologi merupakan salah satu matapelajaran yang dijadikan Ujian Sekolah di tingkat SekolahKejuruan. Untuk mensiasati hal tersebut, dikembangkan modelpembelajaran kooperatif Team Assisted Individualization yangdimaksudkan untuk meningkatkan minat belajar siswa sehinggadapat mendongkrak prestasi belajar siswa. Tujuan penelitian iniuntuk meningkatkan hasil belajar siswa dalam pembelajaran fisikateknologi menggunakan model kooperatif Team AssistedIndividualization pada siswa kelas XI-AV SMK FutuhiyyahMranggen Demak semester genap 2007/2008. Metode Pengumpulandata yang digunakan dalam penelitian ini adalah metode penelitiantindakan kelas (PTK) yang dilaksanakan dalam 2 siklus. Subjekpenelitian terdiri dari 40 siswa kelas XI-AV SMK FutuhiyyahMranggen pada semester genap tahun 2007/2008. Hasil penelitianmenunjukkan bahwa penggunaan model kooperatif tipe TAI dapatmeningkatkan hasil belajar siswa. Hal tersebut dapat dilihat denganadanya peningkatan rata-rata Fisika teknologi dalam ranah kognitifsiswa. Hasil belajar siswa berturut-turut mengalami peningkatandari siklus 1 sampai siklus 2.
PENGARUH HIDROGEN SIANAMIDA TERHADAP PERTUMBUHAN DAN PRODUKSI TANAMAN TEH (Camellia sinensis (L.) O. Kuntze) SETELAH PEMANGKASAN Junaedi, Ahmad; Susanto, Slamet
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 aimed to study the effect of hydrogen cynamide on tea growth and production after pruning. The experiment was conducted at Goalpara Tea Plantation (1100 m above sea levels) from September 1994 to March 1995. Clone TR12025 planted in 1976 with 29 months pruning cycle was pruned a week before application of hydrogen cynamide. Randomized Complete Block Design was used in this experiment with four treatments and four replications. Treatments consist of hydrogen cynamide 0.00 % (control), 0.50 %, 1.25 % and 2.50 %. An experiment unit consists of 20 tea plants. The results showed that treatments of hydrogen cynamide was not significantly increase the number of shoots and weight of "tipping" (shoot tipped on first plucking). The production was not significantly increased by the treatments. However, hydrogen cynamide at 0.50 % could increase 11.5 % fresh weight (equivalent 0f 9.9 % dry weight).
GROWTH PERFORMANCE OF THREE NATIVE TREE SPECIES FOR PULPWOOD PLANTATION IN DRAINED PEATLAND OF PELALAWAN DISTRICT, RIAU Junaedi, Ahmad
Indonesian Journal of Forestry Research Vol 5, No 2 (2018): Indonesian Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

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Abstract

The productivity of exotic species developed in pulpwood plantations in Indonesia (HTI-pulp) has been continuously decreasing.  On the other side, there is a possibility to develop several promising native tree species in peatland HTI-pulp plantations. However, less information is available on the performance of those native tree species for planting in peatland pulpwood plantation. This study evaluates the performances (survival rate, growth and yield) of three native trees [mahang (Macaranga pruinosa), skubung (Macaranga gigantea) and geronggang (Cratoxylum arborescens)] in drained peatland, in terms of suitability for pulpwood plantation. An experiment plot was established by planting three native tree species and krasikarpa (Acacia crassicarpa) in drained peatland at Pelalawan District, Riau. Survival, growth and yield variables were monitored frequently until 5.5 years after planting (YAP) and then were analyzed. Geronggang (survival rate = 80.0%) and mahang (survival rate = 65.6%) showed good survival rates at 5.5 YAP which were significantly (p<0.05) higher than that of krassikarpa (22.4%). Geronggang and mahang are relatively promising growth and yield in which height, diameter and yield increment until 5.5 YAP were 1.96 m/year and 2.31 m/year; 2.08 cm/year and 2.59 cm/year; 13.1 m3/ha/year and 21.4 m3/ha/year, respectively. Yet, those growths and yields were still significantly (p<0.05) lower than those of krasikarpa, probably due to unequal  seedling quality. These results indicated the potential of mahang and geronggang to be developed in peatland pulpwood plantations. However, tree improvement program is necessarily required for mahang and geronggang to initiate the development.