ORCID Profile
0000-0002-5921-261X
Current Organisation
University of South Australia
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Publisher: Elsevier BV
Date: 11-2019
Publisher: Elsevier BV
Date: 04-2020
Publisher: Elsevier BV
Date: 04-2019
Publisher: Elsevier BV
Date: 02-2014
Publisher: American Society of Agricultural and Biological Engineers
Date: 2018
Publisher: Elsevier BV
Date: 11-2016
Publisher: Elsevier BV
Date: 2016
Publisher: CSIRO Publishing
Date: 2020
DOI: 10.1071/SR20010
Abstract: Tillage management can influence soil physical properties such as soil strength, moisture content, temperature, nutrient and oxygen availability, which in turn can affect crop growth during the early establishment phase. However, a short-term ‘strategic’ conventional tillage (CT) shift in tillage practice in a continuous no-tillage (NT) cropping system may change the soil-pore and root geometry. This study identifies the impact of a tillage regime shift on the belowground soil-pore and root geometry. Micro X-ray computed tomography (µXCT) was used to quantify, measure and compare the soil-pore and root architecture associated with the impact of tillage shift across different plant growth stages. Soil porosity was 12.2% higher under CT in the top 0–100 mm and 7.4% in the bottom 100–200 mm of the soil core compared with NT. Soil-pore distribution, i.e. macroporosity (& μm), was 13.4% higher under CT, but mesoporosity (30–75 μm) was 9.6% higher under NT. The vertical distributions of root biomass and root architecture measurements (i.e. root length density) in undisturbed soil cores were 9.6% higher under the NT and 8.7% higher under the CT system respectively. These results suggest that low soil disturbance under the continuous NT system may have encouraged accumulation of more root biomass in the top 100 mm depth, thus developing better soil structure. Overall, µXCT image analyses of soil cores indicated that this tillage shift affected the soil total carbon, due to the significantly higher soil-pore (i.e. pore surface area, porosity and average pore size area) and root architecture (i.e. root length density, root surface density and root biomass) measurements under the CT system.
Publisher: Elsevier BV
Date: 06-2009
Publisher: Elsevier BV
Date: 03-2013
Publisher: Elsevier BV
Date: 2010
Publisher: CSIRO Publishing
Date: 2020
DOI: 10.1071/SR19153
Abstract: The primary features of an effective and efficient furrow opener include controlled soil disturbance and low draught and vertical force requirements. When integrated in a no-tillage seeding system, furrow openers should also have the ability to assist, and not hinder, the functions of seeding system components – such as maintaining adequate surface residue distribution, accurate and uniform placement of seeds and fertiliser, and regular inter-plant spacing. This review highlights how these goals are affected by opener type, geometry and settings, and soil and residue conditions. Typically, tine openers cause greater soil disturbance than disc openers whereas disc openers are likely to cause residue hairpinning. Winged tine openers reduce residue interference with seed placement and support greater lateral seed spread. Inverted-T openers can achieve subsurface soil shattering, which helps conserve moisture and provides good seed–soil contact. A tine opener with concave cutting edge reduces soil disturbance relative to straight and convex cutting edges. Increasing rake angle, tine width and operating depth increase degree of soil disturbance and draught requirement. Increasing forward speed reduces residue interference with sowing but might decrease the accuracy and uniformity of depth and separation of seed and fertiliser placement. Relative to common openers, bentleg openers have lower draught and penetration force requirements while combining minimal lateral soil throw with high furrow backfill, even at speeds of up to 16 km h–1. The performance of bentleg openers need to be evaluated under residue conditions and in cohesive and adhesive soils. Recommendations for future research are presented.
Publisher: Elsevier BV
Date: 05-2012
Publisher: Elsevier
Date: 2018
Publisher: Elsevier BV
Date: 11-2014
Publisher: Elsevier BV
Date: 08-2021
Publisher: Elsevier BV
Date: 07-2018
Publisher: Elsevier BV
Date: 2020
Publisher: Elsevier BV
Date: 07-2021
Publisher: Elsevier BV
Date: 09-2021
Publisher: American Society of Agricultural and Biological Engineers (ASABE)
Date: 2021
DOI: 10.13031/AEA.14252
Abstract: Highlights A simple frame was built to hold and apply uniaxial and biaxial loads to octagonal ring transducers for calibration. Similar results were obtained with the frame as with a universal tensile testing machine. The transducer outputs exhibited low cross-sensitivities and hysteresis (=0.4%), and R 2 = 0.9998. The frame is portable and safe, and its concept can be adapted to take a wide range of non-gravitational loads. Abstract . An extended octagonal ring transducer (EORT) is a simple, single, and compact biaxial force measuring transducer, which is ideal for soil force measurement in tillage tool research. Calibration of EORTs is needed to ascertain their sensitivities and to determine an accurate calibration equation to convert voltage output to force measurement. Typically, calibration of EORTs involves the use of universal tensile testing machines, hydraulic systems and large gravitational loads (hanging weights) to apply loads. In this study, a simple calibration frame that enables application of non-gravitational loads was evaluated and used to hold and calibrate an EORT through both uniaxial and biaxial loading. The frame was suitable for both uniaxial and biaxial application of offset coincident force up to 3000 N and centered perpendicular force up to 1500 N. The EORT exhibited a strong linear relationship (R2 = 0.9998) between applied forces and voltage outputs, low hysteresis errors (=0.4%), and low cross-sensitivities (3.61% and 1.6% for coincident and perpendicular forces, respectively). Calibration equations developed from the primary bridge output data or from the biaxial loading data using the frame produced good force predictions, which also improved when taking into account the impacts of cross-sensitivity. The results confirmed that this calibration approach can integrate the interactions of output cross-sensitivity to deliver more accurate force prediction. Coefficients of determination of the relationships between applied and predicted forces were 0.9993 to 0.9996 and 0.9877 to 0.9984 for coincident and perpendicular forces, respectively. This calibration frame presents potential for safely applying large, non-gravitational loads in a contained and portable manner and its concept can easily be adapted to suit the scale of the transducer. Keywords: Biaxial loading, Cross-sensitivity, EORT calibration, Offset coincident force, Uniaxial loading.
Publisher: Elsevier BV
Date: 09-2021
Publisher: American Society of Agricultural and Biological Engineers
Date: 2017
Publisher: Elsevier
Date: 2021
Publisher: Elsevier BV
Date: 2015
Publisher: Elsevier BV
Date: 06-2010
No related grants have been discovered for Jacky Desbiolles.