Advanced Spectral Remote Sensing for Smart Crop Monitoring in Agriculture and Horticulture

A special issue of Agronomy (ISSN 2073-4395). This special issue belongs to the section "Precision and Digital Agriculture".

Deadline for manuscript submissions: 31 August 2026 | Viewed by 572

Special Issue Editors


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Guest Editor
State Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Key Laboratory of Landscaping, Key Laboratory of Flower Biology and Germplasm Innovation (South), Ministry of Agriculture and Rural Affairs, Key Laboratory of Biology of Ornamental Plants in East China, National Forestry and Grassland Administration, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
Interests: plant nutrition; water stress; disease detection

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Guest Editor
College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
Interests: facilitated precise cultivation and quality control of chrysanthemums; ornamental plant germplasm resources and utilization; high yield and quality control of ornamental plant

E-Mail Website
Guest Editor
College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
Interests: agriculture; remote sensing; growth monitoring; hyperspectra

Special Issue Information

Dear Colleagues,

Sustainable and precise crop production is critical to meeting global food demands, and spectral remote sensing has emerged as a transformative tool in smart agriculture and horticulture. By capturing reflectance data across multiple scales—from leaf and canopy levels to UAV and satellite platforms—researchers can monitor crop development with unprecedented accuracy. These technologies enable the assessment of key crop traits, including growth dynamics, nutrient status, pest and disease presence, and yield potential. Applications span diverse crops, from field staples like wheat and maize to high-value horticultural products such as fruits, vegetables, flowers, and protected crops. As smart farming evolves, integrating spectral sensing with advanced analytics is essential for optimizing productivity and resource efficiency.

This Special Issue seeks to address the challenges of real-time, non-destructive crop monitoring by advancing spectral remote sensing techniques. Despite technological progress, gaps remain in multi-scale data fusion, early stress detection, and predictive modeling for diverse cropping systems. We aim to compile cutting-edge research on spectral-based solutions that enhance precision agriculture, from field to horticultural applications. Contributions should explore novel sensing platforms (e.g., UAVs, satellites), machine learning algorithms, and scalable methods for actionable insights. By bridging theory and practice, this collection will support sustainable crop management and decision-making.

We invite original research, and case studies on spectral remote sensing for crop monitoring, including the following topics:

  • Crop phenotyping and growth analysis using RGB, multispectral, hyperspectral, or LiDAR data.
  • Nutrient and stress detection via spectral indicators for pests, diseases, and abiotic factors.
  • Yield and quality prediction through machine/deep learning models.
  • Multi-scale integration of UAV, ground-based, and satellite remote sensing.
  • Applications in horticulture (e.g., fruits, vegetables, greenhouse crops) and field crops.

Studies leveraging AI for feature extraction, low-cost sensor solutions, or scalability in precision farming are particularly encouraged.

Dr. Jingshan Lu
Prof. Dr. Zhiyong Guan
Dr. Jie Zhu
Guest Editors

Manuscript Submission Information

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Keywords

  • spectral remote sensing
  • crop phenotyping
  • nutrient monitoring
  • pest and disease detection
  • yield and quality assessment
  • UAV
  • machine learning
  • deep learning
  • horticultural crops
  • field crops

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Published Papers (1 paper)

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Research

25 pages, 3593 KB  
Article
Prediction of Apple Canopy Leaf Area Index Based on Near-Infrared Spectroscopy and Machine Learning
by Junkai Zeng, Wei Cao, Yan Chen, Mingyang Yu, Jiyuan Jiang and Jianping Bao
Agronomy 2026, 16(9), 875; https://doi.org/10.3390/agronomy16090875 - 25 Apr 2026
Viewed by 277
Abstract
Traditional leaf area index (LAI) measurement methods are destructive, time-consuming, and labor-intensive. In this study, 282 four-year-old central-leader apple trees were used as research subjects. Canopy reflectance spectra in the range of 4000–10,000 cm−1 were collected, and the corresponding true LAI values [...] Read more.
Traditional leaf area index (LAI) measurement methods are destructive, time-consuming, and labor-intensive. In this study, 282 four-year-old central-leader apple trees were used as research subjects. Canopy reflectance spectra in the range of 4000–10,000 cm−1 were collected, and the corresponding true LAI values were measured destructively by harvesting all leaves from a representative branch of each tree using a leaf area meter. The dataset was randomly divided into training (70%) and testing (30%) sets. Eight spectral pretreatment methods were compared. The Competitive Adaptive Reweighted Sampling (CARS) algorithm was employed to extract characteristic wavelengths. Subsequently, both a BP neural network and a Support Vector Machine (SVM) model for LAI prediction were constructed. The optimal model was selected based on evaluation metrics including the coefficient of determination (R2), mean absolute error (MAE), mean bias error (MBE), and mean absolute percentage error (MAPE). The combined preprocessing of MSC and SD yielded the optimal results, screening out 26 characteristic wavelengths. The SVM linear kernel model (c = 5, g = 0.3) constructed based on MSC + SD preprocessing performed best, achieving a validation set R2 of 0.90, MAE of 0.2117, MBE of −0.1214, and MAPE of 16.09%. The performance on the training set and validation set was comparable, with no overfitting observed. The MSC + SD preprocessing combined with CARS feature screening and SVM linear kernel modeling enables rapid, non-destructive estimation of apple canopy LAI, providing an effective technical tool for precision orchard management. Full article
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