Mitigation of Water-Deficit Stress in Soybean by Seaweed Extract: The Integrated Approaches of UAV-Based Remote Sensing and a Field Trial

In recent years, global agriculture has encountered several challenges exacerbated by the effects of changes in climate, such as extreme water shortages for irrigation and heat waves. Water-deficit stress adversely affects the morpho-physiology of numerous crops, including soybean (Glycine max L.),...

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Bibliographic Details
Published in:Drones (Basel) Vol. 9; no. 7; p. 487
Main Authors: Islam, Md. Raihanul, Abdullah, Hasan Muhammad, Rahman, Md Farhadur, Islam, Mahfuzul, Tuhin, Abdul Kaium, Ashiquzzaman, Md, Islam, Kh Shakibul, Geisseler, Daniel
Format: Journal Article
Language:English
Published: Basel MDPI AG 01.07.2025
Subjects:
Abiotic stress
Algae
Analysis
Bangladesh
biostimulant
Correlation analysis
Crop yield
Crop yields
Crops
Drone aircraft
Drought
Environmental aspects
Experiments
Fluorescence
Growth
Irrigation
Irrigation water
irrigation water-deficit stress
Methods
Moisture content
multispectral imagery
Normalized difference vegetative index
Physiology
Principal components analysis
Rain
Regression models
Remote sensing
Seaweeds
simple linear regression model
Soybean
Soybeans
Sustainable agriculture
Transpiration
Unmanned aerial vehicles
Vapor pressure
Water
Water shortages
Water use
Bangladesh
ISSN:2504-446X, 2504-446X
Online Access:Get full text
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Summary:In recent years, global agriculture has encountered several challenges exacerbated by the effects of changes in climate, such as extreme water shortages for irrigation and heat waves. Water-deficit stress adversely affects the morpho-physiology of numerous crops, including soybean (Glycine max L.), which is considered as promising crop in Bangladesh. Seaweed extract (SWE) has the potential to improve crop yield and alleviate the adverse effects of water-deficit stress. Remote and proximal sensing are also extensively utilized in estimating morpho-physiological traits owing to their cost-efficiency and non-destructive characteristics. The study was carried out to evaluate soybean morpho-physiological traits under the application of water extracts of Gracilaria tenuistipitata var. liui (red seaweed) with two varying irrigation water conditions (100% of total crop water requirement (TCWR) and 70% of TCWR). Principal component analysis (PCA) revealed that among the four treatments, the 70% irrigation + 5% (v/v) SWE and the 100% irrigation treatments overlapped, indicating that the application of SWE effectively mitigated water-deficit stress in soybeans. This result demonstrates that the foliar application of 5% SWE enabled soybeans to achieve morpho-physiological performance comparable to that of fully irrigated plants while reducing irrigation water use by 30%. Based on Pearson’s correlation matrix, a simple linear regression model was used to ascertain the relationship between unmanned aerial vehicle (UAV)-derived vegetation indices and the field-measured physiological characteristics of soybean. The Normalized Difference Red Edge (NDRE) strongly correlated with stomatal conductance (R2 = 0.76), photosystem II efficiency (R2 = 0.78), maximum fluorescence (R2 = 0.64), and apparent transpiration rate (R2 = 0.69). The Soil Adjusted Vegetation Index (SAVI) had the highest correlation with leaf relative water content (R2 = 0.87), the Blue Normalized Difference Vegetation Index (bNDVI) with steady-state fluorescence (R2 = 0.56) and vapor pressure deficit (R2 = 0.74), and the Green Normalized Difference Vegetation Index (gNDVI) with chlorophyll content (R2 = 0.73). Our results demonstrate how UAV and physiological data can be integrated to improve precision soybean farming and support sustainable soybean production under water-deficit stress.
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ISSN:2504-446X
2504-446X
DOI:10.3390/drones9070487