Should I replant, renovate, or change my management?
Before partial or complete renovation, try the simplest and least expensive options first. Typically, this involves improving management of the existing stand. Key elements of improved management are meeting plant nutritional needs (fertilization), proper timing and intensity of defoliation (grazing or mechanical harvest), and providing adequate water (through irrigation scheduling).
Another option is partial renovation. This is often done to introduce a new species into an existing stand in which it will persist and possibly replace less desirable vegetation.
With poor stands, extreme weed problems, or a need to rotate fields to other crops, complete replanting may be appropriate.