Nitrogen and mineral budgets in a simple freshwater live food production system
نویسندگان
چکیده
منابع مشابه
Projected changes in Arctic Ocean freshwater budgets
[1] Arctic Ocean freshwater budgets are examined from 10 models participating in the Intergovernmental Panel on Climate Change Fourth Assessment Report. This includes an analysis of sea ice transport and storage, ocean transport and storage, and net surface flux exchange. Simulated budgets for the late 20th century are compared to available observations, followed by an analysis of simulated cha...
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The surface layer of the ocean undergoes temperature variations which occur at several different temporal scales: a diurnal cycle reSecting day and night variability, an annual cycle showing seasonal variations in insolation and weather, and interannual to decadal cycles, indicating large-scale, long-term climate variability. The strength of a given cycle also depends on the location, for examp...
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Livestock farming systems encompass (i) grazing, (ii) mixed, and (iii) land-less systems. These systems convert crop protein into animal protein with an efficiency ranging from 5% to 45%, depending on animal type, system and management. The nitrogen (N) in the remaining fraction (55– 95%) is in urine and dung, and is conducive to N losses. This paper reviews N input–output budgets and N losses ...
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Industrially produced N-fertilizer is essential to the production of cereals that supports current and projected human populations. We constructed a top-down global N budget for maize, rice, and wheat for a 50-year period (1961 to 2010). Cereals harvested a total of 1551 Tg of N, of which 48% was supplied through fertilizer-N and 4% came from net soil depletion. An estimated 48% (737 Tg) of cro...
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Background: Present study was conducted to measure the level of total mercury (tHg) in sediments, benthos and benthivorous fish (i.e., common carp) for determining Biota (Benthos)-Sediment Accumulation Factor (BSAF), as well as Biomagnification Factor (BMF) of tHg between two trophic levels of benthos and benthivorous fish caught from Sanandaj Gheshlagh Reservoir (SGR) in the west of Iran. Met...
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ژورنال
عنوان ژورنال: Fisheries science
سال: 2002
ISSN: 0919-9268
DOI: 10.2331/fishsci.68.sup1_1010