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Creator:: Shuler, Philip E.
Abstract:: The usefulness of preplant nitrogen (N) in establishing alfalfa in colder production areas has not been well characterized. This study was conducted to determine the effect of preplant N and soil temperature on yield, percent N derived from biological nitrogen fixation (PBNF), and shoot N concentration in alfalfa (Medicago sativa...
Resource Type:: Dissertation
Full Text:: , 1991. Title: The Effect of Preplant Nitrogen Fertilization and Soil Temperature on Biological

Creator:: Thomasson, James E.
Abstract:: The effects of five tillage treatments on soil bulk density and mechanical impedance were examined on Newburg sandy loam soil in the Willamette Valley, Oregon, in 1987. Subsequent effects on seedling emergence and yield of carrots (Daucus carota L., cvs. Orlando Gold and Royal Chantenay) were also measured. Mechanical impedance...
Resource Type:: Masters Thesis
Full Text:: depth. 6. Effects of tillage treatment on carrot development. 29 7. Effect of tillage on

Creator:: Marion, Carol I.
Abstract:: Three rates of urea, urea-DCD, and NH₄N0₃ were soil applied in April and August 1986 to strawberry selection OR-US 4930 and cultivar 'Sumas' to determine effects of the nitrification inhibitor dicyandiamide (DCD) and nitrogen source and rate on soil NH₄ and N0₃ levels, fruit yield and quality, and mineral composition...
Resource Type:: Masters Thesis
Full Text:: OF FIGURES Figure Page 1 Average effect of nitrogen rate on recovery 33 of NH4-N from soil in

Creator:: Jordan, David T.
Resource Type:: Dissertation
Full Text:: of Doctor of Philosophy in Horticulture presented on August 15. 1989. Title: Ammonium in

Creator:: Bañados, Maria Pilar
Abstract:: The effect of planting density and nitrogen (N) fertilization on growth, yield, and N partitioning in young and mature 'Bluecrop' blueberry plants was studied over a two year period. Depleted 15N-ammonium sulfate was applied at different rates and on different dates in a mature planting, and at different rates in...
Resource Type:: Dissertation
Full Text:: ...................................................................................................... 116 5.2 The effect of labeled fertilizer application date on the percentage of 15N in plant parts

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