Global ETD Search

31	Nitrogen budget under coffee Michori, Peter K. January 1993 (has links) No description available. 631.4
32	The influence of soil, climatic and management factors on nitrogen accretion by annual Medicago species in a semi-arid environment of South Australia Dahmane, Ali Ben Kilani. January 1978 (has links) (PDF) No description available. Medicago Nitrogen excretion Soils Nitrogen content
33	Carbon and nitrogen reservoirs off the Oregon coast Ramberg, Donald Allen 10 December 1969 (has links) A cruise of the R/V Yaquina off Oregon during June and July of 1968 provided data for a study of the relationships of hydrographic and chemical parameters to estimates of biological activity. The emphasis was on carbon and nitrogen reservoirs. Phytoplankton pigments, nitrogen and C/N ratio were used along with AOU and the nitrate content of the water to estimate the distribution of phytoplankton production. Sigma-t, AOU, and nitrate were used to define the hydrographic and chemical conditions. Upwelling was the major source of nitrate for the surface waters, and, consequently, phytoplankton production was most intense where upwelling was active. The Columbia River plume appeared to support a sizeable amount of phytoplankton production just south of the river mouth. Particulate nitrogen increased and particulate C/N ratio decreased as the water became more biologically productive. Chlorophyll, particulate nitrogen, and C/N ratio showed the effects of upwelling and the Columbia River plume on biological production. A subsurface negative AOU core was clearly defined in areal extent and intensity. Its occurrence was explained by inshore phytoplankton production, oxygen exchange with the atmosphere, and possible in situ phytoplankton production. / Graduation date: 1970 Seawater -- Composition Seawater -- Nitrogen content Upwelling (Oceanography)
34	Evaluation and use of a soil mineralizable nitrogen test to determine the fertilizer nitrogen needs of winter wheat grown in western Oregon Baloch, Dost M. 31 July 1998 (has links) Graduation date: 1999 Wheat -- Fertilizers -- Oregon Soils -- Nitrogen content -- Oregon
35	Soil nitrogen fractions and their relationship to nitrogen fertilizer yield response and nitrogen uptake of Sudan-Sorghum hybrid grass on twenty Quebec soils. Kadirgamathaiyah, Simathamby. January 1967 (has links) No description available. Soils -- Nitrogen content Nitrogen fertilizers Grasses -- Fertilizers.
36	The effect of time and rate of nitrogen fertilization of corn on the nitrogen balance in some Quebec soils. Sadler, John M. January 1967 (has links) No description available. Nitrogen fertilizers Soils -- Nitrogen content Corn -- Fertilizers.
37	The influence of soil, climatic and management factors on nitrogen accretion by annual Medicago species in a semi-arid environment of South Australia Dahmane, Ali Ben Kilani January 1978 (has links) xiv, 181 leaves : photos. (part col.) tables, graphs ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Agronomy, 1979 Medicago. Nitrogen excretion. Soils Nitrogen content.
38	Crop/Livestock Integration Effects on Soil Quality, Crop Production, and Soil Nitrogen Dynamics Mallory, Ellen B. January 2007 (has links) (PDF) No description available. Agricultural ecology Agricultural systems Soils -- Nitrogen content
39	The effect of pH, rate of nitrogen application, and plants on ammonium volatilization. Mills, Harry Arvin 01 January 1972 (has links) (PDF) No description available. Ammonia as fertilizer Soils Nitrogen content.
40	Nitrification activity in an aquatic ecosystem. Perkins, John Edward 01 January 1978 (has links) (PDF) No description available. Nitrification Water Nitrogen content Pontoosuc Lake Massachusetts.

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