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Fertilizer use and nitrogen release in the Mediterranean region Fertilizer use and nitrogen release in the Mediterranean region
Agriculture is the largest non-point source of pollutants in the Mediterranean (UNEP/MAP 2011). Agriculture-related nutrients enter the sea through groundwater, lakes, wetlands, and rivers. Nitrogen consumption per surface unit of arable land is highest in countries of the northern watershed, with the exception of Bosnia-Herzegovina and Albania. In contrast, point-source release is highest on the eastern coast of the Adriatic. Other point sou...
19 Nov 2013 - by GRID-Arendal
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Dissolved Inorganic Nitrogen export by rivers for world regions Dissolved Inorganic Nitrogen export by rivers for world regions
The figure shows the amounts of nitrogen exported by rivers per year and provides a forecast for the future.
16 Oct 2013 - by GRID-Arendal
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Nitrogen sources to watershed exports to the oceans Nitrogen sources to watershed exports to the oceans
Over the last 20 years, significant data and experience in understanding and addressing the sectoral drivers, pressures, sources, impacts and response to reactive nitrogen have been gathered and progress made in trying to address these issues. The key sectors that are involved include the agriculture, waste-water management, and fertilizer production sectors. As shown in the figure for the year 2000, models indicate that globally, roughly equal a...
16 Oct 2013 - by GRID-Arendal
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Unbalancing the cycle Unbalancing the cycle
The figure compares the flow of nitrogen between the the years 1890 and 1990.
16 Oct 2013 - by GRID-Arendal
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Dead zones and fertilizers Dead zones and fertilizers
The production and use of reactive nitrogen based artificial fertilizers has had huge global benefits providing food for billions through the green revolution. The down side of the increased availability of cheap manufactured nitrogen fertilizer products has been global environment problems associated with excess nutrients, specifically the problems of eutrophication, coastal hypoxic zones and nitrate contaminated groundwater. Tracing the format...
16 Oct 2013 - by GRID-Arendal
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Production of nitrogen Production of nitrogen
The rapid increase in the production of reactive nitrogen via the Haber-Bosch process correlates closely with the increase in world population from about 2.6 billion in 1950 to over 6 billion in 2000 (figure page 78). Based on the figures from Dawson and Hilton (2011), over 2 billion tonnes of reactive nitrogen was manufactured in that period. The enormous increase in artificial fertilizer production catalyzed by the Haber-Bosch process has a...
16 Oct 2013 - by GRID-Arendal
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Fertilizer consumption in the Nordic countries, 1980-1996 Fertilizer consumption in the Nordic countries, 1980-1996
The graph shows the consumption of fertilizers in the Nordic countries form 1980 to 1996 with projections to 2006. The fertilizers included are phosphate, Potash and Nitrogen which are the three most important nutrients for crop growth.
13 Feb 2006 - by Philippe Rekacewicz, UNEP/GRID-Arendal
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Barren Lands Barren Lands
Deforestation is well known for aggravating erosion. Bare soil has no protection against heavy rain, washing away immediately. On hillsides, it readily turns into mudslides leaving people very little time to seek refuge and cutting deep ravines into the earth. And where deforested land was turned into cultivated fields, the soil is likely to be overused and exploited through intensive use of fertiliser.
01 Feb 2006 - by Emmanuelle Bournay, UNEP/GRID-Arendal
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