|Kitchen, Newell - UNIV OF MO|
|Drummond, Scott - UNIV OF MO|
|Birrell, Stuart - U OF MO|
Submitted to: North Central Extension Industry Soil Fertility Conference Proceedings
Publication Type: Proceedings
Publication Acceptance Date: November 20, 1996
Publication Date: N/A
Technical Abstract: An inexpensive and accurate method for measuring water-related, within-field soil productivity variation would greatly enhance site-specific crop management strategies. This paper reports on investigations to use an electromagnetic induction (EM) sensor to map claypan (Udollic Ochraqualfs) and alluvial (Typic and Aquic Udipsamments, and Aeric Fluvaquents) soil conductivity variations and to evaluate the relationship of EM measurements to grain crop production. Grain yield measurement was obtained by yield monitoring. While yield by EM model r**2 values were fairly low, EM sensing helped explain some crop productivity variability for most crop years on both soil types. A theoretical relationship between EM and production was proposed. With several crop-years of data, the theoretical relationship was supported. This tool for measuring field variability of soils will be most useful for predicting gproductivity variability where the range in EM variability is large (> 30 mS/m).