A Hand Caliper for Measuring Thickness of Soybean Pods1
- J. M. McWilliams,
- J. H. Hatchett and
- E. A. Stadelbacher2
A precise, quantitative measure of pod growth, applicable from early pod elongation to full-size green beans, was needed to determine the relationship of soybean [Glycine max (L.) Merr] pod maturity to insect seed feeding damage. Since pods increase in thickness as the seeds develop, measurements of pod thickness can be used for this purpose. A “V” type hand caliper that provided direct thickness measurements of pods in increments of 0.5 mm was devised. The change in pod thickness of a determinate soybean variety was determined by measurements taken in the field at different times during pod growth. The rate of increase in thickness was not uniform but averaged 0.5 mm/4 days. Characterization of pod growth by thickness has potential for relating pod development to insect damage and may have additional application for the study of other stress factors on yield.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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