The effect of seeding time on the heading and yield of wheat in the Willamette Valley Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9p290c76r

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  • Wheat is an important cereal crop in the Willamette Valley of Oregon and the stiff-strawed, high yielding winter varieties are the predominate types grown although spring varieties are not uncommon. Because of the mild, often open winters; present in the Willamette, it is not unusual to be able to seed wheat almost every month from early fall until late spring. The purpose of these studies was to determine the cold requirement and critical heading period of some important winter wheat varieties. The cold requirement and critical heading period was measured by determining the extent that each of the winter varieties would develop heads from various planting dates from late fall until early summer. Results were obtained on the percentage of heading for each variety in the 1961-62 trial and for heading and yields in bushels per acre in the 1962-63 trial. The critical seeding date was determined for each variety and a comparison was made between the two years. The new winter wheat variety, Gaines, had the highest average yield from all dates of seeding for the winter varieties and Gaines likewise had the highest yield from the latest date of seeding in the spring. There was more variation in the critical heading periods in 1961-62 than in 1962-63. Redmond showed the greatest variation between the two years. The critical period for yield was earlier than the critical period for heading. The results also showed lack of agreement between the winter hardiness of the winter varieties and the critical heading period.
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