Effect of variety, planting date and plant population on yield and quality of Snap Bean (Phaseolus vulgaris L.) seed Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/4x51hm904

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  • The objectives of these experiments were to determine the feasibility of saving seed from snap bean fields in the Willamette Valley that have been bypassed for canning and freezing, and to study the effects of different seed production methods on yield and quality of snap bean (Phaseolus vulgaris L.). Field experiments were conducted over a period of two years at the Oregon State University Vegetable Research Farm at Corvallis. The cultivars OSU 1604 and Asgrow 290 were used in these trials. Planting dates in 1975 were May 17, June 20, and July 3, and in 1976 were April 29, May 13, June 4, and June 22. Seeding rates of 165,000, 330,000 and 495,000 seeds/ha were used in both years. The quality of the harvested seed was assessed in terms of germination, seed size, protein content, seedling root length, seedling dry weight, halo blight infection, and field performance. The data indicate that technically it is feasible to produce snap bean seed in the Willamette Valley with yield and quality equal to those produced in traditional seed production areas. It is also suggested that high quality bean seed can be harvested from fields that have been bypassed for processing, provided they have been planted. The seed production methods tested affected nearly all aspects of the crop. Early plantings provided greater yields and delayed plantings decreased yields up to 62%. When planting was delayed until July 3, no seed was harvested because the crop did not mature before the fall rains. The three seeding rates tested did not affect total seed yield appreciably. Laboratory evaluations in 1975 showed no appreciable effects of planting date and seeding rate on seed quality. Field evaluation, however, showed that for Asgrow 290, seeds from the second planting had better stands and produced 20% more pods than seeds from the first planting. Likewise, seeds grown at low density produced 10% and 23% more pods than seeds grown at medium and high densities, respectively. OSU 1604 was not affected by cultural practices. In 1976, yield and seed quality of both cultivars were affected by planting date and seeding rate in the following ways: early plantings and low seeding rates produced greater yields, larger and heavier seeds and heavier seedlings. Late plantings and high seeding rates depressed yields, seed size and seedling weight. Protein content of seed was not affected by either of these variables.
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