Calcium: Do I Need to Apply More?

What is the difference in total calcium, soluble calcium, and exchangeable calcium?  All calcium sources need to be considered and know how it is behaving in the soil in order to get the plants to use it.   Dr. Jim Walworth, Professor of Soil Science Extension Specialist st the University of Arizona, joins Dr. Rob Mikkelsen, Yara Director of Agronomic Services to discuss these topics with a bonus conversation on pecans!