Sentences with phrase «nitrogen content in»

The nitrogen content in the crops is reduced in atmospheres with raised carbon dioxide levels in all three ecosystem types.

Reduced nitrogen content in atmospheres with raised carbon dioxide has previously been attributed to a kind of dilutive effect, in which nitrogen absorption fails to keep pace with the increase in plants» photosynthesis and growth.

Overall, the average nitrogen content in the shells and soft tissue was comparable to that found in previous studies ranging from Cape Cod to the Gulf of Mexico.

Not exact matches

Organic producers can choose from several pelleted organic fertilizer materials that vary in nitrogen content and price.

Meat industry wastewater may also have a high content of nitrogen (from blood) and phosphorus, in addition to pathogenic and non-pathogenic viruses and bacteria, and parasite eggs (not to mention disinfectants and detergents may enter the wastewater stream during facility - cleaning activities, including acid, alkaline, liquid paraffin and neutral compounds)

I'm wondering what my next step should be... should I opt for something heavy in nitrogen such as fish emulsion, something midrange in nitrogen content, or continue with the existing fertilizer?

As shown in previous studies, the litter from the polluted site, which had endured high levels of atmospheric nitrogen oxides and ozone, had higher nitrogen content than litter from the clean site.

The highest nitrogen content, around 2.6 per cent of dry weight, occurs in heather in eastern England, where the average annual fallout of nitrogen is 30 - 40 kilograms per hectare, six times greater than in the relatively unpolluted northwest of Scotland (Environmental Pollution, vol 88, p 193).

The paper «Seasonal ITCZ migration dynamically controls the location of the (sub) tropical Atlantic biogeochemical divide» highlights how dust blowing off Africa's deserts amplify surface levels of iron in the Atlantic that in turn control the spatial activity of nitrogen gas fixing phytoplankton and phosphate content in the Tropical Atlantic.

Researchers led by Carol Pitcairn of the Institute of Terrestrial Ecology in Penicuik, near Edinburgh, have studied the nitrogen content of British sphagnum mosses and heather collected over the past forty years, and correlated these fignres with measurements of the local fallout of nitrogen - containing compounds.

To evaluate any wetland's efficacy in cleaning polluted water, extensive monitoring equipment must quantify the water flow, its incoming and outgoing nitrate content, and the amount of nitrogen stripping occurring.

It breaks down slowly, fertilizing the plants with a generous nitrogen content of a whopping 17 percent compared with the 6 percent nitrogen in commercial turf products.

From 1990 to 2010, the nitrogen isotope record indicates that oxygen content steadily decreased in the area, as expected.

The team found that the degree of nitrogen pollution, which is worsening in urban areas, can be evaluated by analyzing the nitrogen content and the stable isotope ratio in bryophytes.

She checked the historical records and in 2011 began surveying the Mara River annually, measuring the carbon, phosphorus, and nitrogen content of carcasses; counting the numbers of scavengers; testing water quality; and capturing fish for chemical analyses of the sources of their nutrients.

«With the first method, we measured the nitrogen content and by measuring the relationship between the two isotopes of nitrogen, N15 and N14, we could reconstruct the thickness of the compressed snow 19,000 years back in time,» explains Vasileios Gkinis.

The team tested a wide variety of sources of biomass — leaves, stems, flowers, seeds, and legumes — with particular interest in those with high protein content because the amino acids that make up proteins are a rich source of nitrogen.

Possible mechanisms include (iv) fertilization of phytoplankton growth in the Southern Ocean by increased deposition of iron - containing dust from the atmosphere after being carried by winds from colder, drier continental areas, and a subsequent redistribution of limiting nutrients; (v) an increase in the whole ocean nutrient content (e.g., through input of material exposed on shelves or nitrogen fixation); and (vi) an increase in the ratio between carbon and other nutrients assimilated in organic material, resulting in a higher carbon export per unit of limiting nutrient exported.

At the same time it increases the content of Thiol in the skeletal muscle neutralising various nitrogen - based radicals.

The significantly higher protein content was modestly offset by slightly more calories in the control phase, which reduces the amount of protein required to maintain nitrogen balance.

Scientific assays have shown large differences in vitamin and mineral content between foods grown with nitrogen fertilizers and food grown organically.

Wheat for example is often grown with high nitrogen fertiliser in poorer soils because it is paid for by the protein content.

One measured fluid, electrolyte, and renal indices of hydration over eleven days of caffeine consumption in human subjects, finding that doses of up to 6 mg caffeine per kilogram of body weight had no effect on body mass, urine osmolality (urine concentration), urine specific gravity (concentration of excreted materials in urine), urine color, urine volume, sodium excretion, potassium secretion, creatinine content, blood urea nitrogen (forms when protein breaks down), and serum levels of sodium and potassium.

In general, when energy intake is sufficient to meet energy demand, increasing the protein content of the diet imparts no added influence on nitrogen retention (12).

Considering its teenaged protagonists, Clockstoppers comes in surprisingly short on content issues, even though adolescents and crooks employ nitrogen - shooting guns to slow down hyper - travelers.

In this popular PADI course you'll learn why diving with air that has higher oxygen and lower nitrogen content gives you more bottom time, along with enriched air equipment considerations.

These include CO2 concentrations (which generally mediate a positive influence), temperature increases (beneficial to some crops in some regions and harmful elsewhere), increases in droughts, flash floods, weeds, and insect infestations (all harmful), as well as drains on the availability of soil nitrogen needed for the protein content of food crops.

Elevated atmospheric CO2 is associated with decreased plant nitrogen concentration, and therefore decreased protein, in many crops, such as barley, sorghum, and soy.210, 211,212,213 The nutrient content of crops is also projected to decline if soil nitrogen levels are suboptimal, with reduced levels of nutrients such as calcium, iron, zinc, vitamins, and sugars, although this effect is alleviated if sufficient nitrogen is supplied.214 Fourth, farmers are expected to need to use more herbicides and pesticides because of increased growth of pests215, 216,217,218 and weeds219, 220 as well as decreased effectiveness221 and duration222of some of these chemicals (Ch.

Farmers in a climate - smart village in Bihar use the leaf colour chart to judge the nitrogen content required for crops.

Zhaozhong Feng, of the Department of Biological and Environmental Sciences at the University of Gothenburg, Sweden, and colleagues looked at the results of eight experiments in four continents on crops, grasslands and forests, and found that as carbon dioxide levels go up, the nitrogen content of the crop is lowered.

Clay content and initial organic matter content are the main factors in the determination of new equilibrium levels of carbon and nitrogen in the soil.

Soil analysis in 1990 suggested that nitrogen fertilizer application since 1967 had increased the organic carbon content in the surface soil layer by about 3 t / ha in a continuous wheat cropping system.

Scientific confidence of the occurrence of climate change include, for example, that over at least the last 50 years there have been increases in the atmospheric concentration of CO2; increased nitrogen and soot (black carbon) deposition; changes in the surface heat and moisture fluxes over land; increases in lower tropospheric and upper ocean temperatures and ocean heat content; the elevation of sea level; and a large decrease in summer Arctic sea ice coverage and a modest increase in Antarctic sea ice coverage.

«This year I am using favas as «green fertilizer» — they increase nitrogen content naturally by letting them grow — doing their brilliant N - fixing job all fall and winter, then I hoe them under before planting my beds in February.»

Adding leaves to compost effectively increases nitrogen content and creates a valuable natural fertilizer that can be used in the spring.