Journal
GEODERMA
Volume 368, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.geoderma.2020.114276
Keywords
Penetrometer resistance; Bulk density; Thermal conductivity; Small strain shear modulus; Prediction
Categories
Funding
- National Key Research and Development Program of China [2016YFD0300804-3]
- BBSRC Designing Future Wheat project [BB/P016855/1]
- BBSRC/NERC ASSIST project [NE/N018117/1]
- China Scholarship Council
- BBSRC exchange project China: A Virtual Centre for Monitoring the Rhizosphere [BB/P025595/1]
- BBSRC [BB/P025595/1] Funding Source: UKRI
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Continuous estimates of penetrometer resistance (Q) would be useful in root elongation and in soil management studies. However, penetrometers produce estimates of penetration resistance at discrete time points. In this paper, a method with the potential to provide continuous estimates of penetrometer resistance is developed. We use measurements of soil water content, shear wave velocity (V-s) determined from piezo electric devices, and bulk density (rho(b)) determined with the heat pulse (HP) method, to estimate penetrometer resistance. Soil samples of a loamy sand were packed into cylinders with axial pressures of 50, 100, and 200 kPa, and allowed to equilibrate at matric potentials of - 2, - 6, -10, - 30, -100, - 300, and - 500 kPa. Thermal conductivity (lambda), V-s and Q were measured after equilibration. A lambda-based approach was applied to estimate rho(b), and small strain shear modulus (G) was calculated from rho(b) and V-s. Our results confirmed a linear relationship between Q and G (where G = V-s(2)rho(b)), which provides a basis to estimate penetrometer data in the field using buried sensors and a physically based model.
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