Scientia Agricultura Sinica ›› 2025, Vol. 58 ›› Issue (23): 4979-4992.doi: 10.3864/j.issn.0578-1752.2025.23.013

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Research on Soil Moisture Diagnosis Model of Maize Farmland Based on Remote Sensing of Unmanned Aerial Vehicles

LIANG Xue1(), JIANG Yan1,*(), WEI ChangZhou1, XUE Bing2, LI FangFang1, CUI YiRui1, ZHANG XiaRan1   

  1. 1 College of Agriculture, Shihezi University, Shihezi 832003, Xinjiang
    2 College of Geography Science and Planning, Sun Yat-sen University, Guangzhou 510275
  • Received:2024-12-09 Accepted:2025-04-15 Online:2025-12-01 Published:2025-12-09
  • Contact: JIANG Yan

Abstract:

【Objective】 Using unmanned aerial vehicle (UAV) remote sensing technology, a rapid, non-destructive and accurate diagnostic model for monitoring soil moisture in maize farmland was constructed to maximize the efficiency of agricultural water use, so as to provide the theoretical basis and scientific basis for precise irrigation management of maize. 【Method】 In this study, the field maize was used as the research object, and four water treatments were set up through field plot experiments, namely: low water treatment (W1): 495 mm, conventional drip irrigation control treatment (W2): 575 mm, high water treatment (W3): 660 mm, and (W4): 740 mm. In the key growth period of maize, the canopy temperature (Tc), air temperature (Ta), soil moisture and other information of maize were measured synchronously, and the Tc of maize was extracted and optimized by K-Means method and statistical technology. Meanwhile, water-canopy air temperature difference index (WCAI, the sum of CWSI and canopy air temperature difference) and water-canopy air relative temperature difference index (WRTI, the sum of CWSI and relative canopy air temperature difference) were constructed based on crop water stress index (CWSI), Tc, Ta and canopy air temperature difference. The optimal diagnostic model was selected to determine the soil moisture threshold. 【Result】 Tc was negatively correlated with soil moisture. The constructed model WCAI could not well reflect the trend of soil moisture change, while the coefficient of determination R2 between the predicted value and the measured value of soil moisture content based on WRTI model reached more than 0.744, indicating that WRTI was a better model for diagnosing soil moisture. Finally, by comparing the correlation between WRTI and water content in different soil layers at different growth stages of maize, it was found that WRTI had a better effect on diagnosing soil water content in 0-20 cm soil layer at jointing stage, with R2 of 0.785 and 0.859. The diagnosis of soil water content in 0-40 cm soil layer at large bell stage, heading stage and filling stage was better, and the R2 range was 0.796-0.900. Based on the correlation between WRTI and maize yield, the WRTI threshold range of each growth period was 0.218-0.301, and the soil moisture threshold range was 67.8%-80.1% according to the relationship between WRTI and soil moisture content. 【Conclusion】 Because the WCAI model parameter' canopy temperature difference' was greatly affected by the environment, compared with the change trend of WRTI and CWSI under different water treatments, WCAI had no obvious relationship with soil moisture, and WCAI was not suitable for soil moisture diagnosis. The WRTI model parameter' relative canopy temperature difference' weakens the impact of the environment, and its combination with CWSI could better reflect the change of soil moisture, improve the accuracy of soil moisture diagnosis based on remote sensing, effectively reduce the waste of water resources, and achieve water saving and high yield. The research results provided a reference for real-time monitoring of farmland soil moisture and precision irrigation by UAV remote sensing.

Key words: maize, soil moisture, UAV thermal infrared remote sensing, canopy temperature, crop water stress index, canopy air temperature difference

Fig. 1

Test area layout (left) and temperature calibration material (right)"

Fig. 2

The relationship between temperature conversion and calibration"

Fig. 3

Canopy temperature extraction"

Fig. 4

Canopy temperature histogram"

Fig. 5

Canopy temperature changes of two maize varieties at different growth stages under different water treatments"

Fig. 6

Trends of CWSI, WCAI and WRTI"

Fig. 7

Correlation between CWSI and WRTI of DH618 and XY335 and soil moisture content at different depths"

Fig. 8

Validation of the prediction effect of WRTI on soil moisture content"

Fig. 9

Relationship between WRTI and yield"

Table 1

Changes of WRTI and soil relative water content (% of field capacity) threshold with growth period"

生育时期
Growth period
登海618 DH618 先玉335 XY335
WRTI阈值
WRTI threshold
土壤相对含水量阈值
Threshold of soil relative water content (%)
WRTI阈值
WRTI threshold
土壤相对含水量阈值
Threshold of soil relative water content (%)
拔节期 Jointing stage 0.300 75.183 0.301 73.780
大喇叭口期 Big flare stage 0.254 79.376 0.300 78.467
抽穗期 Heading stage 0.218 79.058 0.250 80.052
灌浆期 Grain filling stage 0.241 70.222 0.286 67.797
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