published_or_final_version / Geography and Geology / Master / Master of Philosophy

Studies were conducted at the University of British Columbia during the fall of 1950 to ascertain the effect of varied soil concentration of DDT, Chlordane and Benzene hexachloride upon the growth and nodulation of red clover. The study was divided into two phases: (a) the effect of these insecticides upon clover seed germination, (b) the effect of soil applications of these residual insecticides upon red clover growth and nodule formation. Analyses of the germination and harvest data showed that stimulation of red clover occurred within a limited range and plant injury at higher toxicant concentrations. Significant growth and yield differences occurred between insecticide treatments and between dosage treatments. Nodule formation occurred on all of the plants but the distribution and size of the nodules were affected by the concentrations of the insecticides in the soil. Chemical analyses of the clover plants showed that the nitrogen and phosphorus content of the foliage was unaffected by the presence of high concentrations of DDT, Chlordane or Benzene hexachloride in the soil. The potassium content, however, appeared to be affected by DDT. Biological analyses of the clover plants failed to show any signs of translocation of the insecticides from the roots into the foliage. / Land and Food Systems, Faculty of / Graduate

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This item was digitized as part of the Million Books Project led by Carnegie Mellon University and supported by grants from the National Science Foundation (NSF). Cornell University coordinated the participation of land-grant and agricultural libraries in providing historical agricultural information for the digitization project; the University of Arizona Libraries, the College of Agriculture and Life Sciences, and the Office of Arid Lands Studies collaborated in the selection and provision of material for the digitization project.

This item was digitized as part of the Million Books Project led by Carnegie Mellon University and supported by grants from the National Science Foundation (NSF). Cornell University coordinated the participation of land-grant and agricultural libraries in providing historical agricultural information for the digitization project; the University of Arizona Libraries, the College of Agriculture and Life Sciences, and the Office of Arid Lands Studies collaborated in the selection and provision of material for the digitization project.

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Thesis (PhD)--Stellenbosch University, 1981. / ENGLISH ABSTRACT: No abstract available / AFRIKAANSE OPSOMMING: Geen opsomming beskikbaar

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Photocopy of typescript. / Thesis (Ph. D.)--University of Hawaii at Manoa, 1978. / Bibliography: leaves [174]-183. / Microfiche. / xviii, 183 leaves ill. (some col.)

Thesis (Ph. D.)--University of Minnesota, 1938. / Includes tables. Vita. Published also as Technical bulletin 136, March 1939, of the Minnesota Agricultural experiment station, with title: Nutritive value and chemical composition of certain fresh-water plants of Minnesota. Consists of three parts, part one only (p. 3-34) represents the author's thesis. "Literature cited": p. 31-34, 42, 47.