Functional soil mapping for site-specific soil moisture and crop yield management

• Published in: Geoderma Vol. 200-201; pp. 45 - 54
• Main Authors: Zhu, Q., Lin, H.S., Doolittle, J.A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2013
• Subjects: agricultural land; clay; crop management; crop yield; Crops; Electromagnetic induction; Electromagnetic interference; Geophysics; Hydropedology; Management; Pennsylvania; Precision agriculture; Soil (material); soil map; Soil mapping; Soil maps; Soil moisture; soil properties; soil surveys; soil water; soybeans; temporal variation; Texture; Pennsylvania; USA, Pennsylvania; Precision agriculture; Hydropedology; Electromagnetic induction; Geophysics
• ISSN: 0016-7061; 1872-6259
• DOI: 10.1016/j.geoderma.2013.02.001

To advance site-specific management, detailed functional (application-orientated) soil maps are desirable. This study presents an example of a functional soil map for the management of crop yields and soil moisture in an agricultural landscape located in central Pennsylvania, USA. A high-intensity soil map was prepared using electromagnetic induction (EMI), terrain attribute, and soil core data. Two soil properties, A horizon texture and depth to clay layer were found to be significantly correlated (p<0.05) with soil moisture and crop yields (corn and soybean). A functional soil map was generated by overlaying these two properties on the high-intensity soil map. Spatial and temporal variations in soil moisture and crop yield within different functional map units were statistically compared with those within different map units on the second-order and the high-intensity soil maps. While soil moisture and crop yield did not show obvious difference among map units of the second-order soil map, clear differences were observed among the functional soil map units developed in this study. This study demonstrates that the accuracy and utility of second-order soil maps for site-specific management can be improved using EMI and functional soil mapping approaches. ► A functional soil map was generated from EMI, soil sampling and terrain analysis. ► Soil moisture was better captured in the functional soil map than general soil maps. ► Crop yield was better captured in the functional soil map than general soil maps. ► This study proposes an improved approach for accurate and functional soil mapping.