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Showing 1 to 20 of 5641 for “"Nitrogen"”.
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Soybean nitrogen dynamics: Nitrogen fixation, yield, and residue decomposition
<p>Nitrogen (N) a crucial element for plant growth, often limits net primary productivity of agroecosystems. In agricultural systems it is vital to have proper management of N to secure productivity and environmental sustainability. Soybean [Glycine max (L.) Merr.] is the second most important crop …
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Nitrogen fertilization, nitrogen and nicotine content of burley tobacco
… to study the effect of rates and time of nitrogen application on growth, nitrogen and nicotine contents of leaves and stalks of Burley 21. Rates of nitrogen used were 0, 75, 150 and 225 pounds per acre. Nitrogen was applied as preplant and/or as post plant applications. The maximum rate of …
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Nitrogen recommendation systems, weather effects on nitrogen response, and the prediction of nitrogen response in Illinois
ABSTRACT 1 Nitrogen rate determination by corn producers entails both environmental and economic risk. Over-application increases production costs and causes environmental damage, whereas under-application reduces food production and farm revenue. Several recommendation methodologies have been …
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Ruminal Nitrogen Recycling and Nitrogen Efficiency in Lactating Dairy Cattle
Excess nitrogen (N) excretion from animal agriculture results in reduced air and water quality, and poses a risk to human health. Although the dairy industry utilizes milk urea N (MUN) to monitor protein feeding and N excretion, phenotypic diversity among cows may influence MUN and thus bias feed …
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Nitrogen in sewage
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1885.
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Biological nitrogen fixation in a nitrogen limited tropical lake, Lake Chapala, Mexico.
… my study was to quantify the rate of biological nitrogen fixation in Lake Chapala, Mexico. Lake Chapala is the largest lake in Mexico. It is an ancient, tropical lake which is shaped in an east-west culde-sac with the inflow and outflow at the eastern end. Previous work showed low available …
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Nitrogen spiraling in stream ecosystems spanning a gradient of chronic nitrogen loading
… is a study of the relationships between nitrogen (N) availability and spiraling (the paired processes of nutrient cycling and advective transport) in stream ecosystems. Anthropogenic activities have greatly increased rates of N loading to aquatic ecosystems. However, streams may be …
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Nitrogen-rich oximic complexes
The complexlng behaviour of chloroglyoxine (cgH2), dichloroglyozime (dcgH2), and diaminoglyoxime (dagH2) towards copper and nickel has been studied.
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Fate of coal nitrogen
Thesis. 1976. Sc.D.--Massachusetts Institute of Technology. Dept. of Chemical Engineering.
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Controls on nitrogen fixation and nitrogen release in a diazotrophic endosymbiont of shipworms
Nitrogen fixation is an ecologically important microbial process that can contribute bioavailable combined N to habitats low in N. Shipworms, or wood-boring bivalves, host N2-fixing and cellulolytic symbiotic bacteria in gill bacteriocytes, which have been implicated as a necessary adaptation to an …
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Role of Dissolved Organic Nitrogen in the Soil Nitrogen Cycle of Forest Ecosystems
In the last years, dissolved organic N (DON) has been shown to be a crucial part of the soil N cycle in forest ecosystems. Despite this, information on its dynamics, sources and fate is still lacking. Especially data from (sub)tropical forest ecosystems are scarce. Therefore, this study …
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A Contribution to the Study of the Nitrogen-14 - Nitrogen-15 Hyperfine Structure
Made available in DSpace on 2015-05-12T17:12:23Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6101623.PDF: 2481474 bytes, checksum: eede2fbd9cd32b6c0eb0c9effc003923 (MD5) Previous issue date: 1961
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Natural Nitrogen-15 Abundance and Changes in Total Nitrogen as Influencedby Soil Management
Made available in DSpace on 2014-12-14T14:37:16Z (GMT). No. of bitstreams: 1 7606871.pdf: 2365282 bytes, checksum: f3e5d7d30e2ef03b109d8cac40db8b98 (MD5) Previous issue date: 1975
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Nitrogen balance in college women: the effect of coffee on the nitrogen balance
… from the data obtained from protein (or nitrogen) balance experiments in man. However, due to the nature of the data and the many variable factors involved in the amino acid content of various dietaries, there have been disagreements as to the real requirement, some advocating a high …
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Hyperspectral Reflectance and Stable Isotopic Nitrogen: Tools to Assess Forest Ecosystem Nitrogen Cycling
The use of nitrogenous fertilizers in agricultural and forestry practices coupled with increased fossil fuel combustion and resulting nitrogen (N) deposition across the landscape have contributed to a near doubling of N inputs to terrestrial ecosystems. With such dramatic changes have come adverse …
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Investigating key regulators of nitrogen demand signalling and symbiotic nitrogen fixation in Medicago truncatula
Nitrogen (N) is an essential nutrient required for plant growth and represents a primary limiting factor in determining crop yield. To overcome N limitation, legumes form mutualistic relationship with N-fixing bacteria resulting in the formation of root nodules, where symbiotic N-fixation (SNF) …
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Leaching and Denitrification Losses of Nitrogen-15 Labeled Fertilizer Nitrogen in Two Illinois Soils
Made available in DSpace on 2014-12-14T14:37:25Z (GMT). No. of bitstreams: 1 7811251.pdf: 9783006 bytes, checksum: 39be15590d27e9098a1452678e5cba93 (MD5) Previous issue date: 1978
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