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All Journal SAINS TANAH - Journal of Soil Science and Agroclimatology Jambura Journal of Biomathematics (JJBM)
Kabir, Md Humayun
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Computer Science & IT Decision Sciences, Operations Research & Management Education Mathematics

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Bifurcation analysis of phytoplankton-fish model through parametric control by fish mortality rate and food transfer efficiency Das, Kalyan; Madhusudanan, V.; Srinivas, M. N.; Kabir, Md Humayun; Gani, Md Osman; Islam, Sardar M. N.
Jambura Journal of Biomathematics (JJBM) Volume 4, Issue 2: December 2023
Publisher : Department of Mathematics, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jjbm.v4i2.21480

Abstract

An Algae-zooplankton fish model is studied in this article. First the proposed model is evaluated for positive invariance and boundedness. Then,the Routh-Hurwitz parameters and the Lyapunov function are used to determine the presence of a positive interior steady state and the criteria for plankton model stability (both local and global). Taylor's sequence is also used to discuss Hopf bifurcation and the stability of bifurcated periodic solutions. The model's bifurcation analysis reveals that Hopf-bifurcation can occur when mortality rate and food transfer efficiency are used as bifurcation parameters. Finally, we use numerical simulation to validate the analytical results.
Evaluating the impact of planting dates on seed cotton production across diverse cultivars under variable temperature conditions Mozumder, Shefali; Uddin, F M Jamil; Sarkar, Md Abdur Rahman; Rashid, Md Harun; Paul, Swapan Kumar; Sarkar, Shubroto Kumar; Haque, Md Anowarul; Kabir, Md Humayun
SAINS TANAH - Journal of Soil Science and Agroclimatology Vol 22, No 2 (2025): December
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/stjssa.v22i2.93612

Abstract

Cotton yield in Bangladesh is often constrained by suboptimal planting times under subtropical conditions.  The present study aimed to evaluate the impact of planting dates on seed cotton yield across four cultivars to identify the optimal timing for profitable production. A three replicated field trial was conducted at the Cotton Research Farm in Gazipur using split-plot design during the cotton growing season of 2022-23.  Four cotton cultivars: DM-3, Rupali-1, Suvra, and CB-12 were planted on five dates at ~15-day intervals from June to August (viz: 5 June, 20 June, 5 July, 20 July, and 5 August). Results showed that planting on 20 July significantly increased seed cotton yield by 2.580 t ha⁻¹ compared to 5 June, while the 5 August planting produced the lowest yield and ginning outturn (8.9%) (P < 0.01). Among cultivars, CB-12 achieved the highest yield (2.14 t ha⁻¹), followed by Rupali-1 (1.93 t ha⁻¹) and DM-3 (1.56 t ha⁻¹). Although no significant interaction was observed between planting date and cultivar, CB-12 consistently performed best on 20 July, with similar trends for the other cultivars. The study emphasizes the significance of choosing the most suitable planting dates and cultivars. Adoption of 20 July as the ideal planting date may enhance productivity, offering valuable guidance for cotton growers, researchers, and policymakers.
Co-Authors Gani, Md Osman Haque, Md Anowarul Islam, Sardar M. N. Kalyan Das Madhusudanan, V. Mozumder, Shefali Paul, Swapan Kumar Rashid, Md Harun Sarkar, Md Abdur Rahman Sarkar, Shubroto Kumar Srinivas, M. N. Uddin, F M Jamil