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04. DSSC External Publications (Journals, Books, Conference Proceedings)

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Author: search.filters.author.Manigo, Bryl I.SDG: search.filters.sdg.SDG 2 - Zero hunger

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    Enhancing herbage growth, yield and quality of stevia (Stevia rebaudiana bertoni) using bio-organic nutrients in varied soil media
    Calapardo, Mara Jean Marielle; Manigo, Bryl I. (Penerbit Universiti Kebangsaan Malaysia, 2024)
    The present method of stevia propagation is still insufficient to meet its increasing demand. Moreover, the use of organic inputs as substitutes for inorganic fertilizers to improve soil quality and productivity is also desired. In this study, the effects of bio-organic nutrients and different growing media compositions on Stevia’s herbage growth, yield and quality were determined. A completely randomized design was used with 20 rooted stem cuttings per replication at one cutting per potting bag, laid in a 4 × 4 factorial arrangement. Growing Media (garden soil alone [GS]; GS + rice hull [RH]; GS + vermicompost [VC]; and GS+RH+VC) served as factor A while bio-organic nutrients (fermented fruit juice [FFJ]; vermi tea [VT]; seaweed tea [ST] and control) as factor B. There were 16 treatment combinations replicated four times. Results showed that GS+RH+VC consistently improved the survival rate, plant height, leaf and shoot count per plant, weight (fresh and dry), and herbage yield of Stevia. Furthermore, VT boosted the herbage yield and visual quality. In terms of interaction effects, plants grown in garden soil mixed with vermicompost (GS+VC) with VT application developed more leaves than other treatment combinations. Hence, these bio-nutrients and growing media composition significantly enhanced the production of Stevia.
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    Seaweed-based dripping stimulates root growth of dragon fruit (Hylocereus undatus [Haw.] Britton & Rose) stem cuttings
    Potente, Mayalene M.; Manigo, Bryl I. (Penerbit Universiti Kebangsaan Malaysia, 2023)
    Developing a solid root system is essential in dragon fruit propagation not only for securing the succulent stem but also for facilitating the absorption of water and essential minerals from the soil. However, dragon fruit stem cuttings normally develop good root system for about 4-6 months after planting. There are commercially available growth hormones which hasten rooting, but these are relatively expensive. Hence, alternative hormones from natural materials that possess the ability to stimulate rooting are extensively explored. The efficacy of seaweed-based drippings (SD) as potential rooting bio-stimulant for dragon fruit cuttings were evaluated under nursery condition. Branch cuttings (30 cm long) were soaked at 6, 12 and 18 h at the rate of 50 mL, 100 mL and 150 mL SD per liter of water (H2O), with H2O, and ANAA (5 mL/L of H2O) served as positive and negative control treatments, respectively. There were 18 cuttings in each experimental units, replicated thrice and arranged in a 3 × 5 Completely Randomized Design (CRD). Results showed that 12 h soaking initiated more and longer roots and shoots. In addition, it appeared that the application of a solution containing SD at 100 mL/L of H20 resulted in the development of numerous and longer roots and shoots, a larger number of lateral roots, and a greater root-shoot ratio than other treatments. Furthermore, application of SD at 100 mL/L of H20 through dipping for 12 h developed more lateral roots compared to other treatment combinations. In conclusion, it can be inferred that the presence of phytohormones, such as auxins, in seaweed concentrates has the potential to effectively stimulate root formation in pitaya.