The effect of seeding rate on yield and yield components of two winter wheat varieties Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ks65hh51n

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  • Wheat is an important cereal crop in the Willamette Valley of Oregon and the stiff-strawed, high-yielding varieties are the predominant types grown. Observation of the effect of seeding rates on the yield and yield components are useful in determining which of the components contributes most to the yield of a winter wheat variety and in developing optimum seeding rate recommendations. The experiments were conducted in 1963-1964, 1964-1965, and 1965-1966. The purpose of these studies was to determine the effect of various seeding rates on the yield and yield components of two winter wheat varieties and to find the optimum seeding rates for these varieties. A further objective was to determine if reasonable yields could be obtained from low rates of seeding for both varieties. The yield was measured in terms of bushels per acre. The yield components studied were (1) the number of spikes per unit area, (2) number of spikelets per spike, (3) number of kernels per spike, and (4) the weight of 100 kernels. The results were obtained and comparisons were made between the two varieties and their performance over a three-year period. There was considerable fluctuation in the yields involving both varieties for all seeding rates in the different seasons. The 1966 season was most favorable for Gaines and the 1964 season for Druchamp. Druchamp gave higher yields than Gaines for all seeding rates. The number of spikes per unit area for both varieties was most effected by differences in seeding rate in each year, while the other components showed no response. High yield of Druchamp was due to the result of more spikes per unit area, heavy kernels, and resistance to stripe rust. The yield of Gaines was the result of more kernels per spike. The higher seeding rates for both varieties produced the highest yields.
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