Biosystems Engineering最新文献_第10页

Full-scale experiment on the interaction of two neighbouring low-rise insect-proof nethouses with the wind 两个相邻的低矮防虫网房与风相互作用的全尺寸实验

IF 4.4 1区农林科学

Biosystems Engineering Pub Date : 2025-02-01 DOI: 10.1016/j.biosystemseng.2024.12.010

Anastasios Giannoulis, Demetres Briassoulis, Nikoleta-Georgia Papardaki, Antonis Mistriotis

{"title":"Full-scale experiment on the interaction of two neighbouring low-rise insect-proof nethouses with the wind","authors":"Anastasios Giannoulis, Demetres Briassoulis, Nikoleta-Georgia Papardaki, Antonis Mistriotis","doi":"10.1016/j.biosystemseng.2024.12.010","DOIUrl":"10.1016/j.biosystemseng.2024.12.010","url":null,"abstract":"<div><div>Insect-proof nethouses are low-cost permeable structures covered with high density anti-insect nets, which can provide efficient protection against harmful insects and environmental hazards and regulate the microclimate in favour of the protected cultivation, especially during the summer period. A full-scale experiment of two neighbouring low-rise insect-proof nethouses without cultivation was employed for the analysis of the wind velocities windward, leeward and at the interior of the insect-proof nethouses. Moreover, the wind pressures exerted on the structures were investigated. Two different types of novel insect-proof nets were used as covering materials: The 3353BT Biorete AirPlus 50 mesh with a mesh configuration that allowed for improved air exchange rates; and the OptiNet 50 mesh that provided optical exclusion of pests through incorporated additives that block specific ultraviolet (UV)-visible radiation wavelengths. Anemometers installed at different locations on the field were used to measure the velocity reduction inside and leeward of both nethouses. Specially designed pressure differential sensors were used to measure the wind loads at the nethouses' windward and leeward sides. Velocity reduction inside the AirPlus nethouse was equal to 44%, while for the OptiNet nethouse (denser mesh) this value was equal to 62%. Lower net pressure coefficients were recorded for the windward side of the enhanced ventilation technology AirPlus insect-proof net (C<sub>P</sub> = 0.36) as compared to the denser OptiNet net (C<sub>P</sub> = 0.47). Contrarily, at the leeward sides of the nethouses the difference between the net pressure coefficients was insignificant (AirPlus nethouse: C<sub>P</sub> = −0.26; OptiNet nethouse: C<sub>P</sub> = −0.22).</div></div>","PeriodicalId":9173,"journal":{"name":"Biosystems Engineering","volume":"250 ","pages":"Pages 133-142"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In situ volume measurement of dairy cattle via neural radiance fields-based 3D reconstruction 基于神经辐射场三维重建的奶牛原位体积测量

IF 4.4 1区农林科学

Biosystems Engineering Pub Date : 2025-02-01 DOI: 10.1016/j.biosystemseng.2024.12.009

Xueyao Jing , Tingting Wu , Peng Shen , Zhiqian Chen , Hanyue Jia , Huaibo Song

{"title":"In situ volume measurement of dairy cattle via neural radiance fields-based 3D reconstruction","authors":"Xueyao Jing , Tingting Wu , Peng Shen , Zhiqian Chen , Hanyue Jia , Huaibo Song","doi":"10.1016/j.biosystemseng.2024.12.009","DOIUrl":"10.1016/j.biosystemseng.2024.12.009","url":null,"abstract":"<div><div>Accurate body measurements in dairy farming are labour-intensive and stressful for animals. A more efficient, animal-friendly method for <em>in situ</em> measuring is strongly needed. This study proposes a novel non-contact 3D volume measurement technique for dairy cows using Neural Radiance Fields (NeRF) and short videos captured with a mobile phone. First, multi-view point matching was performed to calculate the camera pose from the sequence of video-extracted images. Then, given that NeRF represented the latest advancement in 3D reconstruction with significant advantages, it was introduced for the first time in the reconstruction of cows. Multi-resolution Hash encoding and Neural Signed Distance Functions (SDF) were employed for refined surface reconstruction. Finally, to achieve accurate volume calculations, Poisson reconstruction and local triangulation were used as specific post-processing techniques to form a closed envelope around the cow's trunk. The measuring effectiveness of the method was verified through two experiments conducted on a sample of 13 cows in a commercial dairy farm. Results showed that Peak Signal-to-noise Ratios were above 25, confirming that the proposed method exhibited a high degree of fidelity to the actual live cow. Coefficient of variation below 2% for 10 measurements on a same cow demonstrated high reproducibility. Comparing this method with a laser-scanned resin cow model yielded a relative error that was found to be 1.25%, demonstrating the method's reliability. This innovative approach provided a reliable and efficient solution for non-contact live cow volume measurement, without the need for additional devices, highlighting its potential to improve herd management through precise volumetric data.</div></div>","PeriodicalId":9173,"journal":{"name":"Biosystems Engineering","volume":"250 ","pages":"Pages 105-116"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of the transmissibility of vibration and dynamic behaviour of coffee plants under field conditions 咖啡树在田间条件下振动传递性和动态特性的评价

IF 4.4 1区农林科学

Biosystems Engineering Pub Date : 2025-02-01 DOI: 10.1016/j.biosystemseng.2025.01.002

Mariana Ribeiro Pereira , Fábio Lúcio Santos , Francisco Scinocca , Hector Andres Tinoco , Geice Paula Villibor

{"title":"Evaluation of the transmissibility of vibration and dynamic behaviour of coffee plants under field conditions","authors":"Mariana Ribeiro Pereira , Fábio Lúcio Santos , Francisco Scinocca , Hector Andres Tinoco , Geice Paula Villibor","doi":"10.1016/j.biosystemseng.2025.01.002","DOIUrl":"10.1016/j.biosystemseng.2025.01.002","url":null,"abstract":"<div><div>Mechanical vibration-based harvesting can efficiently collect coffee fruits, but outcomes depend on machine type and plant factors. Therefore, it is crucial to determine the modal properties involved in this process. In this context, this study aimed to determine the dynamic behaviour of coffee plants through frequency scanning tests, considering different scenarios related to the plant and the ripening stages of the fruit. For this purpose, instrumentation was applied to fifteen plants chosen at random to collect field data for evaluating different scenarios. Through the induction of mechanical vibrations, it was possible to determine the vibration transmissibility in coffee plants, with 20 Hz induced frequency leading to greater transmissibility than the other induced frequencies. The dynamic behaviour of the coffee plants was evaluated using frequency sweep tests, which revealed a greater incidence of natural frequency peaks concentrated above 40 Hz. The analysis indicated that the selective harvesting of coffee fruits through the exclusive application of vibration is impractical in Arabica coffee plants. This is due to the absence of significant differences in the pending loads of fruits at different stages of maturation and the overlap in the frequency values identified in the investigated frequency bands.</div></div>","PeriodicalId":9173,"journal":{"name":"Biosystems Engineering","volume":"250 ","pages":"Pages 225-235"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical properties and critical state characteristics of maize root-soil composites at different soil depths 不同土壤深度下玉米根-土复合材料力学特性及临界状态特征

IF 4.4 1区农林科学

Biosystems Engineering Pub Date : 2025-02-01 DOI: 10.1016/j.biosystemseng.2024.12.014

Xuejie Ma , Zhihong Yu , Min Liu , Jingli Wang , Qiang Su , Jianchao Zhang , Jingjing Xie , Tao Wang

{"title":"Mechanical properties and critical state characteristics of maize root-soil composites at different soil depths","authors":"Xuejie Ma , Zhihong Yu , Min Liu , Jingli Wang , Qiang Su , Jianchao Zhang , Jingjing Xie , Tao Wang","doi":"10.1016/j.biosystemseng.2024.12.014","DOIUrl":"10.1016/j.biosystemseng.2024.12.014","url":null,"abstract":"<div><div>The complex distribution characteristics of root-soil composites pose challenges in understanding their mechanical behaviour during conservation tillage. This study aims to analyse mechanical parameters of root-soil composites at different soil depths, considering root distribution, and establish an empirical critical state model. Three layers were defined based on root density distribution: Shallow Aggregated Root Zone (SARZ: 0–60 mm), Middle Enriched Root Zone (MERZ: 60–150 mm), and Deep Extended Root Zone (DERZ: 150–210 mm). Triaxial tests revealed varying shear strengths, with MERZ exhibiting the highest and SARZ the lowest. The Duncan-Chang model parameters, initial modulus of deformation, and initial Poisson's ratio were significantly influenced by soil depth, mirroring shear strength trends. An empirical formula incorporating soil layer depth into the Duncan-Chang model was proposed. Critical state stress ratios for SARZ and MERZ were determined as 0.93 and 1.11, respectively, quantifying their relationship with soil depth and root distribution. This study provides theoretical and parameter support for understanding the failure mechanism of root-soil composites.</div></div>","PeriodicalId":9173,"journal":{"name":"Biosystems Engineering","volume":"250 ","pages":"Pages 163-173"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Maturity recognition and localisation of broccoli under occlusion based on RGB-D instance segmentation network 基于RGB-D实例分割网络的遮挡下西兰花成熟度识别与定位

IF 4.4 1区农林科学

Biosystems Engineering Pub Date : 2025-02-01 DOI: 10.1016/j.biosystemseng.2025.01.007

Shuo Kang , Jiali Fan , Yongkai Ye , Chenglong Li , Dongdong Du , Jun Wang

{"title":"Maturity recognition and localisation of broccoli under occlusion based on RGB-D instance segmentation network","authors":"Shuo Kang , Jiali Fan , Yongkai Ye , Chenglong Li , Dongdong Du , Jun Wang","doi":"10.1016/j.biosystemseng.2025.01.007","DOIUrl":"10.1016/j.biosystemseng.2025.01.007","url":null,"abstract":"<div><div>Selective harvesting robots for broccoli face significant challenges in field operations, where occlusions by leaves and stems, varying maturity stages and lighting interferences greatly affect performance. Addressing the need for a robust network capable of maturity recognition and localisation under various occlusion conditions for spherical crops, OccluInst—a single-stage instance segmentation network based on RGB-D and CNN-Transformer architecture was proposed. The solution is to make full use of visible information and crop characteristics. This model builds a dual-branch cross-modal calibration framework to generate instance-aware kernels and segmentation mask features. The proposed Attention Weight Interactive Fusion Module (AWIF) enhances the fusion efficiency of multi-scale RGB and depth features in complex scenarios, while the designed Adaptive Fusion Ratio Module (AFR) filters out noisy depth data and extracts valuable information to achieve feature alignment. Additionally, the developed Material Awareness Module (MA) highlights critical areas, improving feature extraction for irregular, multi-scale targets. The improved circular boundary anchor box accurately localises broccoli under various levels of occlusion. Ablation studies confirm the effectiveness of each module. OccluInst can swiftly and accurately identify the maturity categories and coordinates of broccoli under different occlusion levels. It achieves a mAP<sub>50</sub> of 86.2% and mAR of 83.5%, with an average centre point deviation of 3.68 pixels on images with a resolution of 848 × 480, and a detection speed of 51.4 frames per second, providing a robust visual foundation for selective harvesting robots.</div></div>","PeriodicalId":9173,"journal":{"name":"Biosystems Engineering","volume":"250 ","pages":"Pages 270-284"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CFD-DEM coupling simulation and parameter optimisation of sugarcane harvester extractor 甘蔗收获机抽采机CFD-DEM耦合仿真及参数优化

IF 4.4 1区农林科学

Biosystems Engineering Pub Date : 2025-02-01 DOI: 10.1016/j.biosystemseng.2024.12.003

Baocheng Zhou , Shaochun Ma , Weiqing Li , Zhijie Wu , Jun Qian , Peng Huo , Sha Yang

{"title":"CFD-DEM coupling simulation and parameter optimisation of sugarcane harvester extractor","authors":"Baocheng Zhou , Shaochun Ma , Weiqing Li , Zhijie Wu , Jun Qian , Peng Huo , Sha Yang","doi":"10.1016/j.biosystemseng.2024.12.003","DOIUrl":"10.1016/j.biosystemseng.2024.12.003","url":null,"abstract":"<div><div>The impurity removal process of sugarcane mechanised harvesting by extractor faces the challenge of high impurity content and cane loss. To improve the impurity removal performance of extractor and explore the internal flow field and material movement, the impurity removal process was simulated using the computational fluid dynamics (CFD) and discrete element method (DEM) coupled method. The results revealed that the large-sized depression at the installation site of the hydraulic motor, along with variations in the blade profile at the leading and trailing edges, and the short length of the cleaning chamber, contributed to a wide range of vortex and flow separation, which made the material move in disorder and easily discharged from one side of outlet, reducing the impurity removal efficiency. With the number of blades, installation angle, and chord length as factors, and velocity and number of leaves as the indicators, a Box-Behnken experiment was conducted to optimise the extractor parameters. The results showed that, at speeds of 1250, 1450, and 1650 r min<sup>−1</sup>, the average outlet airflow velocity increased by 11.9%, 14.6%, and 19.9% respectively, the total pressure increased by 33.94%, 34.33%, and 25.19% respectively, and the extractor efficiency increased by 34.88%, 36.96% and 39.65% respectively. The improved extractor significantly reduced the impurity content while maintaining a stable cane loss at high travel speeds (3 km h<sup>−1</sup>), the corresponding reduction rates at the three speeds were 20.9%, 23.9%, and 18.0%. The research will contribute to guiding the design and optimisation of sugarcane harvester extractors.</div></div>","PeriodicalId":9173,"journal":{"name":"Biosystems Engineering","volume":"250 ","pages":"Pages 80-93"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design and test investigation of a 3WZ-600 profiling sprayer for dwarf-dense planting jujube orchard 3WZ-600型小密植枣园型型喷雾器的设计与试验研究

IF 4.4 1区农林科学

Biosystems Engineering Pub Date : 2025-02-01 DOI: 10.1016/j.biosystemseng.2024.12.015

Yali Li , Xianfei Wang , Zhiyuan Zhang , Junpeng Liang , Hongtao Sun , Jingbin Li

{"title":"Design and test investigation of a 3WZ-600 profiling sprayer for dwarf-dense planting jujube orchard","authors":"Yali Li , Xianfei Wang , Zhiyuan Zhang , Junpeng Liang , Hongtao Sun , Jingbin Li","doi":"10.1016/j.biosystemseng.2024.12.015","DOIUrl":"10.1016/j.biosystemseng.2024.12.015","url":null,"abstract":"<div><div>Spray application is the primary method of pest management in the dwarf-dense planting jujube orchards, but it offen suffers from off-target drift, poor spray volume uniformity, and low pesticide deposition rates. To address these issues, considering the orchard's planting pattern and the external characteristics of the tree growth, a simplified 3WZ-600 profiling sprayer was designed in this study to accommodate trees of varying heights. In particular, the sprayer's design scheme and relevant parameters were determined through theoretical analysis and numerical simulation. The design focused on the key components necessary for achieving effective profiling spray application, particularly the profiling spray bars. To ensure their stability and safety during operation, static and vibration modal analyses of their profiling posture were conducted using ANSYS software. Subsequently, CFD numerical simulation was employed to simulate the spraying process and study the effects of three different spray distances on droplet movement characteristics, deposition distribution characteristics, and uniformity. The simulation predicted an effective spray range of 400–800 mm. Finally, to validate these simulation results, the profiling sprayer was used to conduct field experiments to explore the influence of spray parameters on operation quality. Optimal working parameters were identified as a speed of 1 m s<sup>−1</sup>, a nozzle pressure of 0.96 MPa, and a spray distance of 400 mm. The test results showed that, under these conditions, the average pesticide adhesion rate was 78.97%, and the deposition coefficient of variation was 21.42%.</div></div>","PeriodicalId":9173,"journal":{"name":"Biosystems Engineering","volume":"250 ","pages":"Pages 213-224"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantitative characterisation of microporous ceramic emitters microstructure and visualisation of seepage based on CT 3D reconstruction 基于CT三维重建的微孔陶瓷发射体微观结构定量表征及渗流可视化

IF 4.4 1区农林科学

Biosystems Engineering Pub Date : 2025-02-01 DOI: 10.1016/j.biosystemseng.2024.12.004

Xuefei He , Pute Wu , Lin Zhang , Shoujun Wu , Xufei Liu , Fuhui Yang , Yuli Sun , Yiqian Wei

{"title":"Quantitative characterisation of microporous ceramic emitters microstructure and visualisation of seepage based on CT 3D reconstruction","authors":"Xuefei He , Pute Wu , Lin Zhang , Shoujun Wu , Xufei Liu , Fuhui Yang , Yuli Sun , Yiqian Wei","doi":"10.1016/j.biosystemseng.2024.12.004","DOIUrl":"10.1016/j.biosystemseng.2024.12.004","url":null,"abstract":"<div><div>Pore characteristics play a leading role in the seepage performance of microporous ceramic emitter. To investigate the pore characteristics and seepage performance of microporous ceramic emitter, the pore parameters such as pore equivalent radius, pore throat size, and pore coordination numbers are quantitatively and statistically analysed by computer tomography (CT) three-dimensional reconstruction. Then, the seepage performance of single-phase water flow in pore space is simulated and analysed, and the three-dimensional visualisation of pore seepage in a microporous ceramic emitter is realised. The results show that the equivalent radius of pores in microporous ceramics predominantly ranges from 40 to 160 μm, with the pore throat size exhibiting a logarithmic normal distribution. With an increase in porosity, the pore coordination numbers rise, enhancing the connectivity among them. The tortuosity of the channel is reduced. The number of pores and the average pore equivalent radius also increase with the increase of porosity. The three-dimensional visualisation of pore seepage in microporous ceramic emitters shows that the permeability of microporous ceramic emitters has obvious anisotropy, and the pore structure has a strong control effect on seepage. With the increase of porosity, the seepage path of the microporous ceramic emitter gradually develops from branching to network. The research results can provide a theoretical reference for the preparation and application of microporous ceramic emitters.</div></div>","PeriodicalId":9173,"journal":{"name":"Biosystems Engineering","volume":"250 ","pages":"Pages 68-79"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Porometer for estimating stomatal conductance in maize: Determination of trueness and precision according to ISO 5725 估计玉米气孔导度用孔隙计：根据ISO 5725测定真性和精密度

IF 4.4 1区农林科学

Biosystems Engineering Pub Date : 2025-02-01 DOI: 10.1016/j.biosystemseng.2024.12.013

Chiara Rusconi , Roberto Confalonieri , Ermes Movedi , Angela Gazzoli , Gregorio Arrigoni , Gloria Brocca , Anna Diva Cosentino , Tommaso Foglia , Federico Lombardo , Brando Mandelli , Marika Pavasini , Giacomo Pigni , Livia Paleari

{"title":"Porometer for estimating stomatal conductance in maize: Determination of trueness and precision according to ISO 5725","authors":"Chiara Rusconi , Roberto Confalonieri , Ermes Movedi , Angela Gazzoli , Gregorio Arrigoni , Gloria Brocca , Anna Diva Cosentino , Tommaso Foglia , Federico Lombardo , Brando Mandelli , Marika Pavasini , Giacomo Pigni , Livia Paleari","doi":"10.1016/j.biosystemseng.2024.12.013","DOIUrl":"10.1016/j.biosystemseng.2024.12.013","url":null,"abstract":"<div><div>Stomatal conductance (<em>g</em><sub><em>s</em></sub>) is a key variable for quantifying crop water status and different technologies have been developed for its determination. While infrared gas analysers (IRGA) are widely recognised as a reference for <em>g</em><sub><em>s</em></sub> measurement, their limited usability and portability, and their cost, are making porometers an increasingly seductive alternative. However, few studies have compared porometers with other methods, and key information on performance metrics along the <em>g</em><sub><em>s</em></sub> biophysical range is missing. The accuracy (precision and trueness) of the LI-600 porometer for <em>g</em><sub><em>s</em></sub> measurement in maize was evaluated using the ISO 5725 protocol. A ring trial was carried out by growing plants in pots under three irrigation regimes to identify different <em>g</em><sub><em>s</em></sub> levels. Measurements of <em>g</em><sub><em>s</em></sub> were performed by three independent groups of operators at two growth stages using the porometer and the IRGA (reference). For intermediate <em>g</em><sub><em>s</em></sub> values, precision was satisfactory (mean relative standard deviation of repeatability and reproducibility <19%), whereas marked underestimations were observed. In cases of severely stressed and well-watered plants, the trueness was good (overall R<sup>2</sup> was 0.62), whereas the poor precision could be compensated by the possibility of taking a high number of replicates (very short time is needed for acquiring data). This, together with the high usability, make porometers an alternative in the case of intensive or time-constrained field campaigns.</div></div>","PeriodicalId":9173,"journal":{"name":"Biosystems Engineering","volume":"250 ","pages":"Pages 158-162"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An opensource indoor climate and yield prediction model for Chinese solar greenhouses 中国太阳能温室室内气候与产量预测开源模型

IF 4.4 1区农林科学

Biosystems Engineering Pub Date : 2025-02-01 DOI: 10.1016/j.biosystemseng.2024.12.007

Bo Zhou , Daniel Reyes Lastiri , Nan Wang , Qichang Yang , Eldert J. van Henten

{"title":"An opensource indoor climate and yield prediction model for Chinese solar greenhouses","authors":"Bo Zhou , Daniel Reyes Lastiri , Nan Wang , Qichang Yang , Eldert J. van Henten","doi":"10.1016/j.biosystemseng.2024.12.007","DOIUrl":"10.1016/j.biosystemseng.2024.12.007","url":null,"abstract":"<div><div>This study introduces a climate model for Chinese solar Greenhouses (CSGs) integrated with a tomato yield model. The developed model evaluates how CSG design and operation influence indoor climate and yield. It was described and validated against three experiments, with different scenarios for selected initial conditions to verify the ability to simulate the impact of large thermal masses. Significant model parameters were identified through sensitivity analysis. The climate and yield model accurately predicted indoor climate variables and tomato yield across the three experiments from one empty CSG in Shenyang and two operational production CSGs in Beijing. Indoor air temperature showed the acceptable results for long-term simulation, with an RRMSE of 12.1%, RMSE of 1.58 °C, and ME of 1.08 °C. The model, for the first time, incorporated the balance of carbon dioxide under CSG conditions achieving an RRMSE ranging from 8.64% to 27.1%, RMSE from 63.72 to 192.5 ppm, and ME from −17.8 to 2.45 ppm. Additionally, tomato yield predictions exhibited satisfactory errors, with an RRMSE ranged from 22.3% to 26.3%, RMSE ranged from 0.61 to 0.71 kg m<sup>−2</sup>, and ME ranged from −0.33 to 0.46 kg m<sup>−2</sup>. The sensitivity analysis underscored the significance of air exchange-related parameters, and introducing a control variable for the optimal LAI would be beneficial for enhancing accuracy. This model is publicly available as open-source Python code at <span><span>https://github.com/jdsjxin/CSGtom</span><svg><path></path></svg></span>, providing a valuable tool for optimising the design and operation of existing CSGs and guiding the improvement of new CSGs in northern China.</div></div>","PeriodicalId":9173,"journal":{"name":"Biosystems Engineering","volume":"250 ","pages":"Pages 183-212"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0