Cucumber powdery mildew detection method based on hyperspectra-terahertz

Article Microbiology

A Rapid Detection Method for Fungal Spores from Greenhouse Crops Based on CMOS Image Sensors and Diffraction Fingerprint Feature Processing

Yafei Wang et al.

Summary: This study proposes a rapid detection method for fungal spores from greenhouse crops based on CMOS image sensors and diffraction fingerprint feature processing. The method utilizes logistic regression, K nearest neighbor, random forest, and support vector machine classification models to classify the spores. The results show that the SVM model has the best overall classification performance, with an average accuracy rate of 92.72%.

JOURNAL OF FUNGI (2022)

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Article Engineering, Electrical & Electronic

Study on the Spectral Characteristics of Plant Growth Regulators Based on the Structure Difference of Terahertz Metamaterial Sensor

Xiaoxue Du et al.

Summary: In this study, a method using terahertz combined with metamaterial sensors was proposed to detect plant growth regulators, aiming to solve the problems of low sensitivity and complex sample pretreatment in traditional detection. Two different structured metamaterial sensors were designed and analyzed for their differences in frequency domain, time domain, and absorption characteristics in detecting plant growth regulators. The results showed that both metamaterial sensors effectively detected the four plant growth regulator solutions with concentrations as low as 0.05 mg/L. In terms of detection and sensing, metamaterial sensor 2 outperformed metamaterial sensor 1 in terms of frequency shift, sensitivity, figure of merit value, vibration amplitude, and change rate of absorption intensity, demonstrating better detection performance. However, in terms of sample identification, metamaterial sensor 1 was more suitable for identifying daminozide and naphthaleneacetic acid solutions, while metamaterial sensor 2 was more suitable for detecting glyphosine and gibberellic acid solutions. This study provides a new method for multi-target fusion to detect plant growth regulators with high sensitivity and accuracy.

IEEE SENSORS JOURNAL (2022)

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Article Agricultural Engineering

Effects of nutrient solution irrigation quantity and powdery mildew infection on the growth and physiological parameters of greenhouse cucumbers

Hanping Mao et al.

Summary: This study observed the effects of water stress and powdery mildew stress on cucumber plants. The results showed that leaf gas exchange parameters exhibited a decreasing and then increasing trend under biotic stress, while significantly decreased under abiotic stress. Cucumber plant height, stem diameter, leaf area, and root-shoot ratio were all affected to varying levels. This study provides a basis for greenhouse environmental control and cucumber cultivation management.

INTERNATIONAL JOURNAL OF AGRICULTURAL AND BIOLOGICAL ENGINEERING (2022)

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Article Computer Science, Information Systems