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Effect of boron on seven vegetable crops grown on two soil typesOneida, Kelly Ann 12 March 1993 (has links)
Boron deficiency or toxicity can reduce yield and
quality of vegetables. Seven vegetable crops, varying from
low to high boron requirements were grown in field plots at
Corvallis in 1987. Leaf-B and yield components of green
bean, cucumber, potato, carrot, tomato, broccoli and table
beet were examined under conditions of fall or spring soil
applied B at a 5 kg/ha rate on two soil types. Soil tests
on control plots indicated B levels of .39 mg/kg and .20
mg/kg in the top 23 cm of soil in the silty clay loam and
sandy loam soil, respectively. Fall or spring application
of B increased soil B levels in the top 23 cm on the silty
clay loam soil to .68 mg/kg and .37 mg/kg, and on the sandy
loam soil to .81 mg/kg and .42 mg/kg, respectively.
Boron application had no effect on yield or yield
components except in green beans where spring applied B on
the sandy loam reduced percent of premium grade pods (sieve
sizes 1-4). Leaf-B levels were not affected in cucumber,
carrot, or tomato on either soil. Boron application on
both soils had a significant effect on leaf-B levels in
bean, broccoli and table beet. Potato leaf-B was
significantly affected only on the sandy loam soil. / Graduation date: 1993
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The effect of mechanical weed cultivation on crop yield and quality,disease incidence and phenology in snap bean, carrot and lettuce crops /Trembley, Marcella L. January 1997 (has links)
Inter-row mechanical cultivation was proposed as a supplement to or substitute for conventional weed control methods currently used in snap bean, carrot and lettuce production. Several types of cultivators were assessed and compared. The effect of mechanical cultivation on crop yield and quality was studied by counting, weighing and grading bean pods, carrot roots and lettuce heads. The effect of mechanical cultivation on disease incidence was studied by surveying fields during the season and by determining the number and weight of diseased pods, roots and heads at harvest. The relationship between the level of Cercospora blight on carrots and potential impacts on yield was also investigated by measuring plant characteristics and the amount of force needed to separate carrot foliage from root. The effect of mechanical cultivation on the phenology of snap bean flowering was studied by determining how long it took for a plant to produce 50% of its flowers and counting how many flowers and pods a plant produced. In general, mechanical cultivation did not affect normal crop production and may be used to replace or complement conventional weed control methods. There was little variation among different cultivators within one season, but cultivator effects differed among crops and from one year to the next.
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The effect of mechanical weed cultivation on crop yield and quality,disease incidence and phenology in snap bean, carrot and lettuce crops /Trembley, Marcella L. January 1997 (has links)
No description available.
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