Sentences with phrase «nitrogen concentrations»

Rules limiting nutrient runoff from farms and wastewater treatment plants helped to decrease nitrogen concentrations in the bay by 23 percent since 1984.
I was told this high nitrogen concentration is okay since it is slow release.
Mr. Bellone pointed to a recent report that showed nitrogen concentrations in one of Long Island's three aquifers rose by 40 percent between 1987 and 2013, while levels in the island's largest aquifer rose by 80 percent during that same time span.
Based on measurements of 45,000 individual plants from 3,680 species, and using high - tech statistical mapping protocols, the team created global maps of plant traits including leaf nitrogen concentration, leaf phosphorus concentration, and specific leaf area (a measure of area displayed to intercept light per unit investment in leaf biomass).
Although both samples were treated in the same way, they exhibited different nitrogen concentrations, but almost identical electronic doping: not all nitrogen atoms were integrated in the graphene lattice, nevertheless the number of electrons in the graphene rose as if this were the case.
Ecologist Martin Burger checks on instruments that help measure water flow and nitrogen concentration underground.
The HOT Program provided decades of data used to reconstruct historical nitrogen concentrations.
Leaf nitrogen concentration and the proportion of heavy to light nitrogen isotopes increased in the last 40 years, just as they did in another experiment when we applied fertilizer to the forest floor,» said S. Joseph Wright, staff scientist at the Smithsonian Tropical Research Institute in Panama.
Evidence from the samples they gathered and tested showed that human wastewater nitrogen from septic systems was a major contributor to the high nitrogen concentrations in the estuary and downstream coastal reefs, the latter representing the northernmost extent of coral growth in South Florida.
Liang and his group analyzed nine environmental factors, including solar radiation, wind speed, precipitation, nitrogen concentration, water temperature and water quality in Lake Erie from 2002 to 2012.
Decreases in nitrogen concentration have also been reported for herbaria plant specimens in response to the increases in Ca during the twentieth century [50].
These differences may relate to the observed differences in nitrogen concentrations.
There, the team set up forest soil samples in chambers at two different temperatures and with two levels of nitrogen concentration (increased nitrogen from agricultural runoff is another factor likely to drive cord growth).
In order to understand the role of nutrient cycling across the sediment water interface sediment cores are routinely collected and analysed for phosphorus and nitrogen concentrations.
Aside from the obvious difference that humans are not altering the nitrogen concentration of the atmosphere, as they are with (several) greenhouse gases, such a question boggles the mind in terms of the mindset that must exist to ask it in a public congressional hearing in the first place.
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