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Original Research Article

SEAWEED ENHANCES GROWTH, YIELD AND YIELD ATTRIBUTES OF BORO RICE (ORYZA SATIVA L.) IN BANGLADESH

Md. Ibrahim Ali, M. F. Hossain, S. Akram, Md. Mahbubul Hassan Sohag, Milon Kobir, Foysal Ahmmed, Shah Mostaq Ahammad Chowdhury, Nazia Naheen Nisheeth, Nadira Akter Jothy, Sadid Md. Zaman

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Md. Ibrahim Ali Corresponding Author

Agronomy Division, Bangladesh Institute of Nuclear Agriculture

ORCID: 0009-0004-4666-5849

Correspondence: ibrahimbd402@gmail.com

Abstract

Marine macroalgae are an increasingly attractive, locally renewable source of crop biostimulants, yet their agronomic value for rice grown under Bangladeshi conditions remains poorly quantified. We evaluated composite preparations of four seaweeds Caulerpa, Hypnea, Sargassum and Gracilaria on the growth and productivity of boro rice across two consecutive dry seasons (2022 and 2023) at Mymensingh. Seaweed was supplied either as a dried basal soil amendment (0–1.25 t ha-1) or as a foliar spray delivered at active tillering (0–1.25 L ha-1), in a randomized complete block design with three replications and 20 m² plots. In both seasons and under both delivery methods, seaweed improved grain yields relative to the untreated control. Basal application was most effective at 0.875–1.00 t ha-1, lifting grain yield to 8.8 t ha-1 in 2022 (Binadhan-24) and 5.73 t ha-1 in 2023 (BINA dhan25); the highest basal rate (1.25 t ha-1) depressed yield sharply, revealing a threshold beyond which the amendment became inhibitory. Foliar sprays raised grain yield by 16–19% over the control, with the optimum near 1.0–1.25 L ha-1. The response was driven mainly by more effective tillers, a greater number of filled grains and fewer sterile spikelets, whereas plant height and 1000-grain weight changed little a pattern indicating that seaweed enlarged the reproductive sink rather than individual grain size. Quadratic dose response models described a clear yield optimum, and grain yield was positively correlated with filled grains and effective tillers. Collectively, these results identify seaweed biostimulants as a low-cost, locally sourced input that can support sustainable intensification of boro rice.

Keywords: Biostimulant; Caulerpa; Foliar Application; Gracilaria; Grain Filling; Oryza Sativa; Sustainable Intensification
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How to Cite

APA

Ali, M. I., Hossain, M. F., Akram, S., Sohag, M. M. H., Kobir, M., Ahmmed, F., Chowdhury, S. M. A., Nisheeth, N. N., Jothy, N. A., & Zaman, S. M. (2026). SEAWEED ENHANCES GROWTH, YIELD AND YIELD ATTRIBUTES OF BORO RICE (ORYZA SATIVA L.) IN BANGLADESH. British Journal of Advanced Research, 1(4), Article 034. https://doi.org/10.68263/BJAR-5X43DJK3

MLA

Ali, Md. Ibrahim, M. F. Hossain, S. Akram, Md. Mahbubul Hassan Sohag, Milon Kobir, Foysal Ahmmed, Shah Mostaq Ahammad Chowdhury, Nazia Naheen Nisheeth, Nadira Akter Jothy, and Sadid Md. Zaman. "SEAWEED ENHANCES GROWTH, YIELD AND YIELD ATTRIBUTES OF BORO RICE (ORYZA SATIVA L.) IN BANGLADESH." British Journal of Advanced Research, vol. 1, no. 4, 2026, article 034. DOI: https://doi.org/10.68263/BJAR-5X43DJK3

Chicago

Ali, Md. Ibrahim, M. F. Hossain, S. Akram, Md. Mahbubul Hassan Sohag, Milon Kobir, Foysal Ahmmed, Shah Mostaq Ahammad Chowdhury, Nazia Naheen Nisheeth, Nadira Akter Jothy, and Sadid Md. Zaman. "SEAWEED ENHANCES GROWTH, YIELD AND YIELD ATTRIBUTES OF BORO RICE (ORYZA SATIVA L.) IN BANGLADESH." British Journal of Advanced Research 1, no. 4 (2026): 034. https://doi.org/10.68263/BJAR-5X43DJK3

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ISSN 3153-709X
Tracking ID BJAR_SEP_26_039
Article No. 034
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Article Info
Journal BJAR
Volume Vol 1, No 4
Year 2026
Type Original Research Article
Licence CC BY-NC-SA 4.0
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