Graduate Thesis Or Dissertation
 

Presoaking and drying treatments to improve the performance of orchardgrass and bluegrass seed

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  • The objective of this study was to develop a soaking and drying procedure to stimulate the germination and seedling emergence of orchardgrass (Dactylis glomerata L.) and Kentucky bluegrass (Poa pratensis L.) seed. Some of the physiological changes associated with the soaking and drying treatments were also studied. The seed was soaked on top of blotters moistened with solutions of 200 ppm GA₃, distilled H₂O and 20,000 ppm NaC1. The most beneficial results were obtained by soaking at 5 C for periods of 3 to 6 days. Following soaking, the seed lots were dried to their original dry weight and stored up to 8 months before testing. The effect of the treatment on the performance of the seed was evaluated in terms of germination and growth measurements. Presoaked seed germinated up to one day earlier than the unsoaked control. Radicle growth rate was not affected by any of the treatments. Seedling emergence from soil was more rapid after treatment. Germination tests conducted 8 months after presoaking indicated that the treatments had not caused any loss of viability during storage. Compared to water, there appeared to be little benefit from soaking in GA₃ and NaC1 solutions. Since seedling growth rates were not increased by the treatments, the beneficial results appeared to be related to the effects on germination rate. The small increase in imbibition rate and O₂ uptake by treated seeds may account for part of the accelerated germination. The treatments reduced the level of dormancy as indicated by the reduced requirement for alternating temperatures. Presoaking and drying treatments were most effective on cultivars and seed lots exhibiting higher levels of dormancy.
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