Soil & Water Res., 2024, 19(1):25-31 | DOI: 10.17221/78/2023-SWR

Assessing soil aggregate stability by measuring light transmission decrease during aggregate disintegrationOriginal Paper

Mikuláš Madaras1*, Robert Krejčí2, Markéta Mayerová1
1 Crop Research Institute, Prague, Czech Republic
2 Microdesignum, s.r.o., Tuchoměřice, Czech Republic

Advancements in technology have recently enabled to assess soil aggregate stability (SAS) using digital devices. To address the need for a faster and more efficient method of measuring SAS, we have developed a simple yet effective approach using a specialized device. The innovative method named SlakeLight involves measuring the changes in light transmittance as aggregates undergo slaking. The device consists of the measuring chamber, which is placed on a LED light source with a surface-homogeneous distribution of luminosity. During the disintegration process of aggregates immersed in water, reduction in the light emitted to the photodiodes is proportional to SAS. The functionality of the device was tested using topsoil samples from two field fertilization trials. The recorded SAStrans values were compared with the wet sieving method (WSA) and SLAKE test. The new method showed a strong correlation with both reference methods (r = 0.89 for WSA, r = –0.86 for SLAKE). The device was able to detect a statistically significant differences in SAS between the grassland and the cropland at both sites. Although differences in SAStrans were not significant between different fertilization treatments unlike WSA, the simplicity and speed of the measurement increase the potential of the method for practical implementation in agriculture, surpassing the limitations of traditional and labor-intensive laboratory techniques.

Keywords: field experiment; optoelectronics; sensors; soil health monitoring; soil structure

Received: August 1, 2023; Revised: September 25, 2023; Accepted: September 27, 2023; Prepublished online: November 20, 2023; Published: February 15, 2024  Show citation

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Madaras M, Krejčí R, Mayerová M. Assessing soil aggregate stability by measuring light transmission decrease during aggregate disintegration. Soil & Water Res. 2024;19(1):25-31. doi: 10.17221/78/2023-SWR.
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