Click on “Download PDF” for the PDF version or on the title for the HTML version.

If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.

Agitated soil measurement method for integrated mapping of soil pH, potassium and nitrate contents

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  MC06-4106,  2005 Special Meeting Papers. (doi: 10.13031/2013.26851) @2006
Authors:   Balaji Sethuramasamyraja, Viacheslav I Adamchuk
Keywords:   Soil pH, potassium, nitrate, ion-selective electrode, on-the-go soil sensors, precision agriculture

The main objective of precision agriculture is optimized management of spatial and temporal field variability to reduce waste, increase profits and protect the quality of the environment. Knowledge of the spatial variability of soil attributes is critical for successful site-specific crop management. Different approaches to assess this variability on-the-go have been pursued through development of soil sensors. One of the methods, Agitated Soil Measurement (ASM) has been intended for integrated on-the-go mapping of soil pH, soluble potassium and residual nitrate contents using ion selective electrodes (ISE). To implement ASM, an Integrated Agitation Chamber Module (IACM) was developed and attached to a commercial soil pH mapping equipment. Based on the field simulation test, neither precision nor accuracy estimates have improved when compared to the previously investigated Direct Soil Measurement (DSM) method (RMSE ranged between 0.11 for pH to 0.22 for pNO3). However, in addition to reduced electrode abuse, laboratory evaluation of the ASM method revealed significantly lower measurement errors (RMSE ranged between 0.05 for pK to 0.13 for pNO3) for all three properties and, therefore, retained the potential for improved quality of on-the-go field mapping.

(Download PDF)    (Export to EndNotes)