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Leaf-air temperature difference as a reliable indicator for potato water status.

Peng Liu¹, Ting Guan¹, Mingshou Fan¹

¹College of Agronomy, Inner Mongolia Agricultural University, Hohhot, China.

Frontiers in Plant Science

|September 17, 2025

Summary

Leaf-air temperature difference (LAD) effectively monitors potato water status in arid regions. The fourth leaf position (L4) is optimal for this precision irrigation technique, improving water use efficiency.

Keywords:

infrared thermometry leaf position moisture diagnosis precision irrigation water stress

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Area of Science:

Agricultural Science
Plant Physiology
Water Management

Background:

Precision irrigation is crucial for potato (Solanum tuberosum L.) production in water-scarce, semi-arid regions.
Real-time, non-destructive methods for assessing plant water status are needed for efficient irrigation management.

Purpose of the Study:

To investigate the feasibility of using leaf-air temperature difference (LAD) as an indicator for diagnosing potato water status.
To identify the optimal leaf position for LAD measurements in potatoes.

Main Methods:

A field experiment evaluated LAD at three leaf positions (L1, L4, L8) under five irrigation levels (0-300 mm) across different growth stages.
Correlations between LAD, irrigation levels, plant water content (PWC), and soil moisture were analyzed.

Main Results:

LAD showed significant correlations with irrigation levels, PWC, and soil moisture.
The fourth leaf from the top (L4) demonstrated the strongest relationships and highest sensitivity to water status with minimal variability.
A LAD threshold was identified, beyond which yield was not further enhanced.

Conclusions:

LAD is a reliable indicator for monitoring potato water status, particularly at the L4 position.
This method supports precision irrigation, enhancing water use efficiency and sustainable potato production in semi-arid environments.