Assessment of potential nutrient build-up around beef cattle production areas using electromagnetic induction

• Published in: Environmental technology Vol. 32; no. 15; pp. 1825 - 1833
• Main Authors: Cordeiro, Marcos R.C, Sri Ranjan, Ramanathan, Cicek, Nazim
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 01.11.2011; Taylor & Francis Ltd
• Subjects: Agriculture; Animals; Applied sciences; beef cattle; Cattle; cattle production; compacted soils; drainage channels; Electric Conductivity; electrical conductivity; electromagnetic induction; environmental technology; Exact sciences and technology; farms; feedlot; Geographic Information Systems; global positioning systems; linear models; nutrients; permeability; Pollution; regression analysis; roads; runoff; Soil - analysis; soil map; Soil Pollutants - analysis; soil salinity; Soils; Studies; water content; Manitoba; British Isles; Canada, Manitoba; feedlot; Cartography; Electrical conductivity; Potential distribution; Induction; Linear regression; Property of soil; Calibration; Plume; Permeability; Salinity; nutrients; Design; electromagnetic induction; Pollution; Regression model; Production; Water content; Percolation; Permeable soil
• ISSN: 1479-487X; 0959-3330; 1479-487X
• DOI: 10.1080/09593330.2011.559275

Electromagnetic induction (EMI) has been used to map soil properties such as salinity and water content. The objective of this research is to use EMI to map the potential distribution of nutrients around beef cattle pens and to relate this distribution to major physiographic field features. Beef cattle farms in different physiographic locations were surveyed in Manitoba, Canada, using an EM-38 conductivity meter georeferenced with a GPS receiver. Samples were collected using a response surface design and analysed for electrical conductivity (EC ₑ), which was used as a proxy for determining potential build-up of nutrients. Multiple linear regression models (MLR) were used for calibration of the EM readings. The results showed that areas 1 through 4 had EC ₑ≤3.5 dS m ⁻¹, but areas 5 and 6 exceeded this concentration and reached maximum values of 5.5 and 7.0 dS m⁻¹, respectively. Higher values in area 6 were probably due to the presence of a rocky layer at 0.3 m depth, leaving a thin soil layer to accumulate the nutrients. Micro-depressions played a major role in salt accumulation, with the depressions corresponding to higher values of EC ₑ. The presence of features such as drainage ditches and compacted soils beneath roads strongly affected the direction of the plumes. Based on these results, the location of the pens on high elevations and the provision to collect the run-off from the pens were identified as good design criteria. Highly permeable soils may require a low permeability liner to capture the deep percolation and redirect it towards a collection area.