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A kinetic analysis of herbicide degradation in soil

Creator:: Zimdahl, Robert L.
Resource Type:: Dissertation
Full Text:: following individuals: Dr. Virgil H. Freed whose fine example, encouragem nt and advice have contributed

Chemical and physical factors in the kinetics of herbicide penetration into plants

Creator:: López, Hernán
Abstract:: Penetration has long been recognized as an important factor in the action of chemicals on plants. The effectiveness of herbicides on such plants as blackberries is often thought to be limited by the failure to obtain adequate penetration through the cuticular barrier. A number of factors, among them relative humidity,...
Resource Type:: Dissertation
Full Text:: special debt of gratitude is owed to Dr. Virgil H. Freed for assistance in planning and conducting the

The distribution, growth habits, and control of German velvetgrass (Holcus mollis L.) in Western Oregon

Creator:: Lee, William O., 1911-
Abstract:: A study was conducted on German velvetgrass (Holcus mollis L.), a weedy, rhizomateous perennial grass introduced in the United States in relatively recent years, The purpose of this study was to learn more about its distribution, growth habits, and control under conditions found in Western Oregon. German velvetgrass infestations of...
Resource Type:: Dissertation
Full Text:: Graduate cornrnittee, Drs. T. M. ching, w. w. chilcote, and. v. H. Freed for help and suggestions

Microbial degradation of atrazine in soils

Creator:: Skipper, H. D. (Horace D.)
Abstract:: Atrazine is an asymmetrical s-triazine herbicide used pre- and post-emergence for the control of weeds in many crops. Under conditions considered unfavorable for microbial activity, atrazine may persist in soils for extended periods of time. However, the significance of chemical versus microbial degradation is not known. This study was conducted...
Resource Type:: Masters Thesis
Full Text:: . To Drs. V. H. Freed and A. P. Appleby for helpful discussions during phases of this study and the

The influence of soil moisture and method of application on the movement of the herbicide EPTC in soil

Creator:: Omid, Ahmad
Resource Type:: Masters Thesis
Full Text:: wish to acknowledge the assistance of Dr. Virgil H. Freed tor making this studJ possible. Page

Determination of the adsorption and movement of 2,3,6-trichlorobenzoic acid in soil as influenced by soil type and water percolation

Creator:: Del Pozo, Jenaro
Resource Type:: Masters Thesis
Full Text:: appreciation is tendered to Professor Virgil freed, Agricultural Chemistry Department, for nuc va1jable

The influence of chemical and biochemical properties on the herbicidal efficiency of 3-cyclohexyl-5, 6-trimethylene uracil and 2-bromo-6'T-butyl-o-acetotoluidide

Creator:: Mackenzie, John William
Abstract:: Application of herbicides to the soil has become an important factor in the production of row crops. Economic production of sugar beet (Beta vulgaris), an important row crop, requires efficient methods of weed control. Two experimental herbicides, 3-cyclohexyl-5,6-trimethylene uracil (DP634) and 2-bromo-6't-butyl-o-acetotoluidide (CP32179), had shown promise in sugar beet screening...
Resource Type:: Masters Thesis
Full Text:: william Chilcote for their crltical reviews of the manuscrlpt. Dr. Vlrgll E. Freed, !II, . .Marvin

The influence of various climate and edaphic factors on the toxicity of 2-tert. butylamino-4-ethylamino-6-methylthio-s-triazine (Igran) to winter wheat (Triticum aestivum Vill., Host)

Creator:: Figuerola, Luis Fernan
Abstract:: Several studies were conducted to determine the influence of various environmental factors on the toxicity of 2-tert.butylamino- 4-ethylamino-6-methylthio-s-triazirxe (Igran) to winter wheat. The effect of temperature on Igran toxicity was studied by growing wheat plants in pots submerged in water baths to control soil temperature and in controlled-environment chambers. Igran...
Resource Type:: Dissertation
Full Text:: greater at 37 C than at 26 C. Montgomery and Freed (1963) also studied the effect of temperature on the

The influence of selected environmental factors on diuron toxicity to winter wheat

Creator:: Homesley, Wylie Buress
Abstract:: Previous work has shown that diuron (3-(3, 4- dichlorophenyl)-1, 1-dimethylurea) is less toxic to fall-planted wheat than to wheat planted in the spring. Diuron has been a significant factor in increasing yields of winter wheat grown in Oregon's Willamette Valley. The influence of several selected environmental factors on diuron toxicity...
Resource Type:: Dissertation
Full Text:: -chlorophenyl) -1, l-dimethylurea (3, 31). Montgomery and. Freed (33, p. 90) have proposed that temperature is

The effects of CIPC vapors on dodder (Cuscuta spp.) seedlings

Creator:: Slater, Clarence Harold
Abstract:: The use of CIPC (isopropyl N-(3-chlorophenyl) carbamate) to control dodder (Cuscuta spp.) in alfalfa is an established practice. A rate of six pounds per acre applied to moist soil has given good dodder control lasting from four to six weeks. The purpose of this study was to determine the effect...
Resource Type:: Masters Thesis
Full Text:: emulsifible concentrate mixed in a 6 mm layer of soil covered by 4 mm of activated carbon. H. Emergence

ScholarsArchive@OSU

A kinetic analysis of herbicide degradation in soil

Chemical and physical factors in the kinetics of herbicide penetration into plants

The distribution, growth habits, and control of German velvetgrass (Holcus mollis L.) in Western Oregon

Microbial degradation of atrazine in soils

The influence of soil moisture and method of application on the movement of the herbicide EPTC in soil

Determination of the adsorption and movement of 2,3,6-trichlorobenzoic acid in soil as influenced by soil type and water percolation

The influence of chemical and biochemical properties on the herbicidal efficiency of 3-cyclohexyl-5, 6-trimethylene uracil and 2-bromo-6'T-butyl-o-acetotoluidide

The influence of various climate and edaphic factors on the toxicity of 2-tert. butylamino-4-ethylamino-6-methylthio-s-triazine (Igran) to winter wheat (Triticum aestivum Vill., Host)

The influence of selected environmental factors on diuron toxicity to winter wheat

The effects of CIPC vapors on dodder (Cuscuta spp.) seedlings

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