Image 1. Critical root radius : The CRR is used to define the portion of the root system nearest the stem that is critical for stability and vitality of the tree. This area is usually beyond the dripline of the tree. The radius of this circular area is defined as CRR (in feet ) = DBH x 1.5. Pokorny, et al. 2003. (Graphic provided by Stephanie Adams)

Managing the Critical Root Zone in Pecan Orchards:

In commercial pecan production, management decisions are often driven by what can be readily observed such as the canopy, nut set, and visible symptoms of decline. This emphasis is understandable, but incomplete. The structural integrity and long-term productivity of pecan trees are governed primarily by processes occurring belowground. A shift toward root-centered management is not...

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Image 1. Order of root system (Image provided by Stephanie Adams)

Tree Health Starts in the Roots

Root health is the most overlooked factor in pecan productivity. When trees decline, attention often turns to foliar nutrients, water availability, or soil fertility. Yet the real story begins belowground—within a complex system that most growers rarely see. Healthy soil and healthy roots are not synonymous. A pecan orchard can have biologically rich, well-structured soil...

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