Pump Up That Seed: Priming And Pregermination.pdf

Establishing new turfgrass can be challenging, especially when time is of the essence, such as for a spring tournament or renovation of tees and cart paths. Seed germination time varies by species, with factors like soil temperature and moisture levels playing a significant role. Generally, seeds germinate faster in warmer soils, but there are methods to stimulate germination, including soil heating, seed pregermination, and seed priming.

The germination process begins when a seed absorbs water, triggering the release of hormones that break down the starchy endosperm, providing energy for growth. However, this process is risky, as the seedling relies on stored energy until it develops leaves and roots. Intermittent wet and dry periods can lead to failure, as the seedling may exhaust its energy source before establishing a leaf system.

Optimal soil temperature for cool-season grasses is between 60°F and 85°F. To speed up germination under suboptimal conditions, alternatives like soil heating, seed pregermination, and seed priming can be used. Soil heating can be achieved using covers, which retain solar heat, or high-intensity discharge lamps. Pregermination involves bringing seeds to the point of germination, while priming involves partial imbibition without completing germination. Pregermination can be performed by soaking seeds in water, replacing the water daily, and monitoring for root development.