Effects of boron applications on growth, yield, and boron content of snap beans Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/w3763924m

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  • An investigation of the effects of soil and foliar applications of boron and of time of foliar application of boron on growth, yield, and boron content of bush snap beans was made during the 1962 growing season. This study was conducted at two locations: Corvallis and Aurora, Oregon. Yield, dry weight, and boron content were computed on the individual plot basis, and results were statistically analyzed. Data were also collected on sieve size distribution of pods and percent pod set. Rates of zero, one, and two pounds of boron per acre were applied to the soil, and the foliar rates consisted of 0, 10, 50, 100, 250, 500, and 1,000 ppm boron. Applications of boron to the soil in general resulted in a slight decrease in yield of snap beans. Foliar applications of boron followed an erratic pattern, slightly increasing yield in one location and decreasing it at the other. Foliar rates of 250 and 500 ppm boron applied under a combined early-late foliar application resulted in the largest decrease in yield of snap beans, although the effects of boron applications were, not statistically significant. Boron applications decreased the. dry weight of the above-ground portion of bean plants at one location and increased dry weights at the other. However, boron applications did not significantly affect dry weight of snap beans. Soil applied boron produced a statistically significant increase in boron content of bean plants, irrespective of the time of sampling. An earlier sampling made prior to bloom showed that boron content of bean plants was higher at this stage of growth than at full bloom. Foliar applications of boron consistently increased boron content of bean plants. Boron content of plants at bloom ranged from approximately 22 to 50 ppm at Corvallis and from 20 to 35 at Aurora. Because no toxic effects were observed as a result of boron applications to the soil, it is believed that the soil boron rates used in this experiment were within the range of tolerance, of snap beans to boron. No toxicity effects due to foliar applications of boron were observed when rates below 250 ppm boron were applied. Neither percent pod set nor sieve size distribution were significantly affected by the boron levels used in this experiment. The relationship of the results of this study to reports of other work is discussed.
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