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Creator:: Pettygrove, G. Stuart
Abstract:: Sulfur-coated urea (SCU), a slow release nitrogen fertilizer, may be economically competitive with conventional fertilizers, but little is known of the mechanism of urea release from SCU and the environmental factors which affect the urea release rate. Objectives of this thesis were: (1) to determine factors which affect the rate...
Resource Type:: Dissertation
Full Text:: approved: V. V. Volk Sulfur-coated urea (SCU), a slow release nitrogen fertilizer, may be economically

Creator:: Gill, Ranjit Singh
Abstract:: Preliminary fertilization trials with western hemlock have yielded responses which vary significantly from stand to stand, especially in areas near the Pacific Coast. Growth responses have varied from positive to negative in an erratic manner. Previous data did not permit validation of such hypotheses as, "the application of fertilizer to...
Resource Type:: Dissertation

Creator:: James, D. W. (David W.), 1929-
Abstract:: The physico-chemical reactions of ammonia in soils and clays have many practical and theoretical implications. On the one hand, large quantities of anhydrous ammonia are used annually in agriculture for fertilizer; the dry gas is applied directly to the soil by simply injecting it below the ground surface. On the...
Resource Type:: Dissertation
Full Text:: accounts for the widespread use of gaseous ammonia as a fertilizer. Examples of the quantities of ammonia

Creator:: Park, Jerry Eugene
Abstract:: Annual ryegrass (Lolium multiflorum) is a major seed crop in the Willamette Valley of Oregon. Persistent crop diseases have necessitated annual field burning to protect future crops. This practice, while very effective for disease eradication, produces large quantities of air polluting smoke in the valley and a general wastage of...
Resource Type:: Dissertation
Full Text:: , under con- trolled conditions, the modified components could be used as sub- strates for microbial

Creator:: Lim, Hyungsik
Abstract:: Application of sewage sludge to soils increases the trace metal content and the organic content of soils. The complexation of indigenous and added metals with organic constituents must be studied to evaluate metal availability to plants and animals. The water soluble organic fractions (WSOF) from an agricultural soil (W), a...
Resource Type:: Dissertation
Full Text:: , and decreased in concentration as the sludge component in the mixture decreased. At 77 K, the Cu(II

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