Abstract
ABSTRACTSeveral studies have explored the potential of electrical resistivity tomography to monitor changes in soil moisture associated with the root water uptake of different crops. Such studies usually use a set of limited below‐ground measurements throughout the growth season but are often unable to get a complete picture of the dynamics of the processes. With the development of high‐throughput phenotyping platforms, we now have the capability to collect more frequent above‐ground measurements, such as canopy cover, enabling the comparison with below‐ground data. In this study hourly direct‐current resistivity data were collected under the Field Scanalyzer platform at Rothamsted Research with different winter wheat varieties and nitrogen treatments in 2018 and 2019. Results from both years demonstrate the importance of applying the temperature correction to interpret hourly electrical conductivity data. Crops which received larger amounts of nitrogen showed larger canopy cover and more rapid changes in electrical conductivity, especially during large rainfall events. The varieties showed contrasted heights although this does not appear to have influenced electrical conductivity dynamics. The daily cyclic component of the electrical conductivity signal was extracted by decomposing the time series. A shift in this daily component was observed during the growth season. For crops with appreciable difference in canopy cover, high‐frequency direct‐current resistivity monitoring was able to distinguish the different below‐ground behaviours. The results also highlight how coarse temporal sampling may affect interpretation of resistivity data from crop monitoring studies.
Highlights
– Hourly electrical resistivity tomography data were collected under a high-throughput field phenotyping platform. – The dynamics of the electrical conductivity (EC) varied mainly with N treatments and canopy cover. – We identified a shift in the EC diurnal cycle probably due to the root water uptake. – Little EC difference between the wheat varieties was observed
To analyse the value of geoelectrical monitoring under high-throughput phenotying platform in a phenotyping context, this paper focuses on the following research questions. (i) What is the potential of geophysical tools for monitoring below-ground dynamics? (ii) How can geophysically derived below-ground information be linked to above-ground traits dynamics? (iii) What are the capabilities and limitations of geoelectrical monitoring for phenotyping applications?
This study shows hourly electrical resistivity monitoring applied to small scale agricultural plots with different wheat varieties and nitrogen treatments
Summary
Senapati and Semenov (2020) show that European wheat varieties still have genetic potential to be exploited through breeding programs. Traits such as optimal root water uptake are present in the genetic population but still need to be selected and transferred into commercial varieties via crop breeding. To create new varieties with desirable traits (e.g. high yield, short stem and deep rooting), crop breeders cross other varieties which exhibit one or several of the desired traits. This process generates large number of different genotypes (or lines). Near Surface Geophysics published by John Wiley & Sons Ltd on behalf of European Association of Geoscientists and Engineers
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