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All Journal Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) JURNAL ILMU PERTANIAN Jurnal Penelitian Karet Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat International Journal of Basic and Applied Science Action Research Literate (ARL) PERTANIAN TROPIK Journal of Environmental and Development Studies
Nini Rahmawati
Universitas Sumatera Utara
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Physics Social Sciences

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Produksi dan Fisiologi Kedelai pada Kondisi Cekaman Kekeringan dengan Aplikasi Bradyrhizobium japonicum yang Diberi Penginduksi Genistein Hasanah, Yaya; Rahmawati, Nini
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 (310.822 KB) | DOI: 10.24831/jai.v42i2.8427

Abstract

ABSTRACTMutualism symbiosis between B. japonicum and soybean root is a complex case and managed by molecular signal exchange. Genistein is one of the main isoflavones in soybean root exudates which is responsive to nod gen induction in B. japonicum. Drought stress could give negative effect on the symbiosis. The aim of the research was to study the role of B. japonicum induced by genistein on production and physiological characters of soybean under drought stress. The experiment was conducted in a green house, Faculty of Agriculture, University of Sumatera Utara, using a randomized complete block design with three factors. The first factor was genistein induction, consisted of  with and without genistein. The second factor  was B. japonicum inoculation consisted of  without B. japonicum,  isolate 1, isolate 2 and isolate 3. The third factor  was soil water content condition, consisted of 40%, 60% and 80% of field capacity. The parameters observed were shoot dry weight, root dry weight,  net assimilation rate, dry weight per plant, 50 seeds weight and proline content. The result showed that increasing drought stress conditions decreased shoot dry weight, root dry weight, net assimilation rate, effective nodules number, seeds dry weight per plant and 50 seeds weight. The result showed that as an inducer of B. japonicum in drought stress condition, genistein reduced the effects of water stress on root nodulation of soybean. Proline acts as osmoregulator for increasing tolerance to drought stress in plants.Keywords: drought, genistein, soybean, root nodulation
Exploration of the Potential of Local Cassava Genotypes to Support Food Security in the Highlands of Toba Regency Setiawan, Andi; Rosmayati, Rosmayati; Rahmawati, Nini
Action Research Literate Vol. 9 No. 12 (2025): Action Research Literate
Publisher : Ridwan Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46799/arl.v9i12.3075

Abstract

One of the cassava-producing districts in the highlands topography is Toba Regency. Cassava plantation centres spread across Toba Regency are located in Laguboti District. Cassava land is starting to be displaced due to a lack of land management and processing. This study aims to enable the community to maximize the growth of cassava-based on different genotypes and land use according to soil characteristics so as to increase the production of cassava as a food crop in Toba Regency, North Sumatra, Indonesia. The method is the determination of land units, observations of morphological characteristics of cassava, observations of land characteristics, and the collection and analysis of soil samples on cassava fields carried out in the laboratory. The results were 7 types of cassava diversity in Toba Regency with different morphological characters, namely Malaysia (G1), Siroti (G2), Simerah (G3), Sumedang (G4), Siputih (G5), Adira (G6) and UJ5. (G7). The distribution of pH and nutrient content in each cassava field with different genotypes in Laguboti District, Toba Regency is very varied. pH ranged from acid-neutral, Nitrogen ranged from 0.17% – 0.63%, Phosphorus ranged from 0.05% – 0.24%, and Potassium ranged from 0.04% – 0.27%. The altitude of the place ranges from 920-940 m asl.
Studi Pengaruh Konsentrasi dan Frekuensi Pemberian NAA Terhadap Pertumbuhan Tunas Stek Umbi Porang (Amorphohallus muelleri Blume) Mora, Yun Fita; Rahmawati, Nini; Siregar, Luthfi A M
AGRIUM: Jurnal Ilmu Pertanian Vol 29, No 1 (2026)
Publisher : UNIVERSITAS MUHAMMADIYAH SUMATERA UTARA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/agrium.v29i1.26270

Abstract

Increasing industrial demand for porang requires efficient propagation strategies, such as tuber cuttings combined with NAA application to enhance shoot and root development. This study aimed to evaluate the effects of NAA concentration and application frequency on the growth of porang tuber cuttings. The experiment was conducted from July to December 2024 in Pagar Merbau III Village, Lubuk Pakam District, and at the Biotechnology Laboratory, Faculty of Agriculture, University of North Sumatra, using a two-factor Randomized Block Design with three replications. The treatments consisted of four levels of NAA concentration (0, 50, 100, and 150 ppm) and two application frequencies (single application at the beginning of the nursery stage and repeated application at the beginning of the nursery stage and 7 days after sowing). Observed variables included shoot emergence percentage, plant growth, biomass, tuber weight, chlorophyll content, and stomatal density. Data were analyzed using ANOVA followed by Duncan’s Multiple Range Test at a 5% significance level. The results showed that the application of NAA at 100 ppm significantly enhanced shoot growth, plant height, fresh and dry weight, chlorophyll content, and stomatal characteristics. A single application at the early nursery stage produced optimal results in plant height, tuber weight, and chlorophyll content, while repeated application increased the number of shoots, vegetative growth, and biomass accumulation. The interaction between 100 ppm NAA and early application resulted in the best performance in leaf number at 3 weeks after planting and tuber weight.
Co-Authors Afifudin Dalimunthe, Afifudin Andi Setiawan Asmarlaili Sahar Hanafiah Cemda, Abdul Rahman Darma Bakti Delvian Harahap, Azmi wijayanti Harahap, Fitra Syawal Kurnia Selekta Etika Harefa Lubis, Nursiani Luthfi Aziz Mahmud Siregar Mora, Yun Fita Nur Ulina Warnisyah S Sebayang, Nur Ulina Warnisyah S Ridwansyah Rosmayati Rosmayati Rosmayati Rosmayati Rosmayati Sihotang, Tambun Silvia Nora, Silvia Siregar, Luthfi A M Tengku Sabrina Yaya Hasanah Yuliddar Abbas, M Astri Zulfansyah, Ichfan