Agronomy Degree Practice Exam

Approximately how long can a pure stand of alfalfa be expected to persist in Oklahoma?

1. 6 months

2. 3 years

3. 6 years

4. 20 years

The correct answer is: 6 years

A pure stand of alfalfa in Oklahoma can be expected to persist for about six years due to several factors. Alfalfa is a perennial forage legume known for its durability and productive lifespan. The ideal climate and soil conditions found in Oklahoma contribute to the health and longevity of alfalfa stands, enabling them to thrive for extended periods. Over time, factors like soil fertility, management practices, pest pressures, and environmental stressors (such as drought or extreme temperatures) can influence the persistence of alfalfa stands. With proper management, including regular maintenance, appropriate fertility programs, and pest control, alfalfa can successfully last and produce high yields for many years, typically averaging around six years for pure stands. While some may hope for greater longevity, the typical lifespan of a pure stand of alfalfa is not as extensive as the much longer durations suggested in other options. Thus, understanding the growth characteristics and needs of alfalfa reinforces the expectation of a productive period that aligns with the correct choice.