Research in Agricultural Engineering, 2025 (vol. 71), issue 4
Detection of heat-stressed chickens in poultry house based on deep network and optical flow vectors in the Fourier domainOriginal Paper
Ngo Quoc Viet, Thai Yen
Res. Agr. Eng., 2025, 71(4):189-199 | DOI: 10.17221/46/2025-RAE 
The productivity and quality of the entire flock are negatively impacted by heat stress in chickens, which can have major repercussions, particularly in crowded farming settings where diseases are easy to spread and hard to control. This study uses deep networks and optical flow to identify heat stress in chickens. The technique focuses on identifying obvious signs of heat stress, such as panting and open-mouth breathing in chickens. There are two phases to the suggested approach: (1) using a deep network to detect open-mouth breathing in chickens; (2) using the Gunnar Farnebäck algorithm to compute the optical flow vectors of the wattle, the breathing...
Optimisation of the irrigation requirement of okra under protected cultivation using a digital lysimeterOriginal Paper
Sujitha Elango, Nagarajan Madasamy, Valliammai Annamalai, Vijayaprabhakar Arumugam
Res. Agr. Eng., 2025, 71(4):200-212 | DOI: 10.17221/31/2025-RAE
A field experiment was conducted in 2023 and 2024 to determine stage-specific crop coefficient values of okra (Abelmoschus esculentus) using the popular F1 hybrid Arka Nikita. Six evapotranspiration (ETc) based treatments were applied: five under a forced ventilated greenhouse (T1 = 120% ETc, T2 = 100% ETc, T3 = 80% ETc, T4 = 60% ETc, T5 = 100% ETc in lysimeter) and one under open field (T6 = 100% ETc) arranged in a completely randomised block design...
Study on the drying kinetics of Rosa flower buds using different drying methodsOriginal Paper
Hamid Reza Gazor, Omid Reza Roustapour
Res. Agr. Eng., 2025, 71(4):213-223 | DOI: 10.17221/43/2025-RAE
This study investigated the drying kinetics of Rosa flower buds (Rosa damascene Mill) under environmental conditions (shade), as well as in direct and indirect solar dryers. The effects of 40 °C, 50 °C, and 60 °C temperatures on the drying of the buds were also examined using a laboratory cabinet dryer. The drying rate of the Rosa flower buds was compared with various mathematical models, and the parameters of these models were evaluated. The results illustrated that drying Rosa flower buds under shade required a lengthy period time of approximately 13 days. In contrast, utilising solar dryers significantly reduced...
Effect of foam-mat drying conditions on drying rate and anthocyanin content in purple sweet potato powderOriginal Paper
Chi Dung Nguyen, Van Hao Hong , Ngoc Giau Tran, Minh Thuy Nguyen, Van Tai Ngo
Res. Agr. Eng., 2025, 71(4):224-234 | DOI: 10.17221/84/2025-RAE
The study aimed to optimise foam-mat drying parameters for producing purple-fleshed sweet potato (PFSP) powder. Egg albumin (EA) (5–15%), xanthan gum (XG) (0.1–0.5%), and drying temperature (50–70 °C) were used as independent variables for optimisation via Response Surface Methodology with a Box-Behnken design. The response variables (drying rate and anthocyanin content) were assessed by 18 treatments, which included 6 central points. The analysis of variance showed a high coefficient of determination (> 88%) between predicted and experimental values across all models. Optimal foam-mat drying conditions were 11.02% EA, 0.34% XG,...
Architecture of a cyber-physical system for washing agricultural machineryOriginal Paper
Anatoliy Tryhuba, Orest Filkin, Inna Тryhuba, Andriy Tatomyr, Oksana Malanchuk
Res. Agr. Eng., 2025, 71(4):235-246
This paper presents the architecture of a cyber-physical system for the automated washing of agricultural machinery, designed to enhance efficiency and intelligent control. The system includes four layers – physical, sensor, computational, and interface and integrates actuators, sensors, decision-making modules, and analytics. A Python-based simulation using Control and SimPy showed an average washing time of 10.4 minutes and 97.5% cycle initiation accuracy under critical contamination. The Control was achieved via gated recurrent unit (GRU) prediction and proportional–integral–derivative (PID) regulation. Despite assumptions like...
Biodegradable seedling pots from sawdust and spent mushroom compostOriginal Paper
Joseph Kofi Conduah, Francis Kumi, Hans Fumba Murangaza, Seth Osei
Res. Agr. Eng., 2025, 71(4):247-258 | DOI: 10.17221/116/2025-RAE
Circular bioeconomy is rapidly gaining ground in the agricultural sector with priority given to the utilisation of more environmentally friendly materials for production and processing. Thus, in this study, biodegradable seedling pots were developed using sawdust (SD) and spent mushroom compost (SMC) as a sustainable alternative to plastic containers. Four pots composed of SMC : SD ratios of 100 : 0, 70 : 30, 60 : 40, and 50 : 50 were developed and evaluated. The mechanical properties, structural characteristics, and water absorption capacity of the pots were assessed and seedlings were made to grow in them to monitor the growth support potential....