Sentences with phrase «of organic nitrogen»

«Sediment cores in Arctic lakes show that there have been significant 20th - century declines in the nitrogen isotopic composition of organic nitrogen,» Steig said.

In words of Isabel Reche, «saline wetlands are extremely productive ecosystems that act as natural filters by mineralizing organic matter and reducing the load of organic nitrogen they receive.

Not exact matches

Poultry manure is generally higher in plant nutrients, like nitrogen, phosphorous and potassium, than other types of manure but lower in organic matter.

Concentrations of total nitrogen were 10 %, nitrate 30 % and nitrite 87 % lower in organic compared to conventional crops.

Is the productivity of organic farms restricted by the supply of available nitrogen?

When serving «nitrate» vegetables, the levels of nitrates in Organics are reduced though not 100 percent eradicated (Nitrates are naturally occurring and farming without using nitrogen fertilizers does not eliminate nitrate concentration).

In order to maintain the nutrition of his soils and continually grow high - quality food, Gerard rotates numerous crops through his fields, including barley, oats, yellow mustard, food peas for splitting, French green lentils, and alfalfa for fixing nitrogen and providing organic matter to the soil.

The lower levels of nitrogen and higher amounts of antioxidants found in organic fruits and vegetables create more intense flavors.

In anticipation of its activities at Natural Products Expo West, The Organic Center released new research findings from the University of Virginia in collaboration with The Organic Center showing that organic farming can help reduce nitrogen pollution on a global scale.

While organic gardeners concede the point that most compost is low in soluble nitrogen, potassium, and phosphorous, Jack Ruttle observes: «I have grown many fine vegetable gardens with no other fertilizer than an inch or two of pure compost applied once a year, and I have known plenty of other gardeners who do the same.»

The soil sample report will typically give the following information: soil type or texture, pH, salinity (expressed as electro - conductivity), percentage of organic matter, and fertility status as indicated by the levels of nitrogen, potassium, and phosphorous.

In some states, specialized tests also report on zinc, manganese, copper, boron, sulfates, and silt.ture, pH, salinity (expressed as electro - conductivity), percentage of organic matter, and fertility status as indicated by the levels of nitrogen, potassium, and phosphorous.

ture, pH, salinity (expressed as electro - conductivity), percentage of organic matter, and fertility status as indicated by the levels of nitrogen, potassium, and phosphorous.

The economic consequences of nitrogen being scarce on organic farms are quite impressive: the opportunity costs (cost of producing on - farm) of 1 kg nitrogen on organic farms can amount to seven to sixteen times the cost of mineral N - fertilizers8.

Since organic farms are mostly mixed farms, integrating animal husbandry with crop production, using vast and diverse rotations, intercrops and green cover crops, and maintaining soil fertility by cultivating nitrogen fixing legumes, they display a higher diversity of domesticated species than conventional farms.

So it is not surprising that in contrast to conventional farms where manure and slurry are often a waste problem, organic farmers are forced to develop efficient nitrogen management strategies like intercropping, catch cropping, optimal ploughing - in of legume crops or limiting the use of liquid manure to avoid nitrogen losses.

Many soils in such lowland tropical areas are considered infertile and so Terra Preta, with its enhanced fertility due to high levels of soil organic matter and nutrients such as nitrogen, phosphorus, potassium and calcium, is quite an anomaly.

the permanent plant cover in organic systems which results in a more efficient uptake of mobile nitrogen in soils, thus reducing the potential and risk for N2O emissions.

The ban on synthetically - produced mineral nitrogen in organic agriculture confines the productivity to the natural system limits (i.e. N - fixation) or the limits defined by the annual nutrient balance of the farm, including imported fodder and organic fertilizers.

Known more accurately as soil organic carbon, it is part of soil organic matter, which is made up of decaying plant and animal matter, and essential elements for good plant growth such as calcium, phosphorous, and nitrogen.

«Garden equipment engines emit high levels of carbon monoxide, volatile organic compounds and nitrogen oxides, producing up to 5 % of the nation's air pollution and a good deal more in many metropolitan areas like Los Angeles.

When serving «nitrate» vegetables, the levels of nitrates in Organics are significantly reduced though not 100 percent eradicated (Nitrates are naturally occurring and farming without using nitrogen fertilizers does not eliminate nitrate concentration).

The EU National Emission Ceilings Directive sets ceilings for each Member State for emissions of ammonia, oxides of nitrogen, sulphur dioxide and volatile organic compounds (VOCs).

He cites three common ways for producers to introduce nitrogen into soil: synthetic fertilizer; manure or other organic amendments; and through cultivation of nitrogen fixing pulse crops.

The results of the experiment showed that organic matter in soil was heavily influenced by the type of supplemental nitrogen added.

The researchers also linked the rates of nitrogen loss with the supply of organic material that drives the rates: more organic material equates to more nitrogen loss, so the quantity of the material matters too, Babbin said.

Scientists have recently used the Canadian Light Source (CLS) to evaluate the effects of various sources of supplemental nitrogen fertilizer on the chemical composition of soil organic matter.

The Methods: Photochemical modeling by a Caltech team indicates that ethane, a hydrocarbon detected on Titan by both of the Voyager spacecraft and the European Infrared Space Observatory, is created when solar ultraviolet light breaks down methane, a minor component of Titan's nitrogen - rich atmosphere, into a stew of organic molecules that form a dense orange - brown smog.

The authors of a new study say that there has been limited information available about the influence of fertilizer sources of nitrogen that can be injected and fertigated on fruit yield and quality in organic blackberry.

South of East St. Louis, the industrial plants in Sauget release hundreds of tons of volatile organic matter, sulfur dioxide and nitrogen oxides each year.

The ConocoPhillips Wood River refinery also released nearly 5,000 tons of sulfur dioxide, 4,000 tons of nitrogen oxides and 2,000 tons of volatile organic matter, according to data from the U.S. Environmental Protection Agency.

Scientists investigated the spatial (vertical) and temporal dynamics of nitrate, extractable organic nitrogen (EON), and total nitrogen in soil, and estimated the leaching - dominated N loss based on N balance in soil.

One gallon of typical domestic wastewater contains enough organic compounds and nitrogen to power a 100 - watt lightbulb for five minutes.

And Cornell University researcher David Pimentel found that organic farms use 63 percent of the energy used by same - size conventional farms, which rely on large amounts of nitrogen fertilizer produced synthetically with large amounts of energy.

A team led by scientists at Lawrence Berkeley National Laboratory found that the type of plant inputs (that is, root or needle litter) affected total carbon and nitrogen retention over 10 years, but that soil horizon (essentially, the layer of soil, such as the topsoil organic or deeper mineral layers) affected how the litter - derived soil organic material is stabilized in the long term.

The team used stable isotope labels to trace plant litter - derived carbon and nitrogen as the litter decomposed and formed soil, specifically the fraction of soil called organic matter, which comes from plant inputs and microscopic animals.

Schlesinger noted that as the ecosystem changed, key nutrients in the soil — such as nitrogen, phosphorus, and various organic elements — accumulated beneath the canopies of the mesquite bushes, forming what he called islands of fertility and starving out the surrounding grasses.

Yet there is always some leftover organic material, consisting of carbon, nitrogen, and minerals, which remains sequestered in the soil, somehow prevented from further decomposition.

This study aids in the broader understanding of the complex mechanisms that influence harmful algal bloom progression in bodies of water rich in organic nutrients such as phosphorus and nitrogen, and points to the direct need to reduce nutrient pollution in the face of both urban and agricultural development.

The element nitrogen (N) is a key component of all organic macromolecules.

While most management practices focus on reducing inputs of nitrogen and other nutrients known to fuel dead zones, Canuel says «organic matter from the watershed may also contribute.

An international group of researchers led by the University of Granada (UGR) has found that the greater flamingo (Phoenicopterus roseus) facilitates microbial «filtering» of organic matter in saline wetlands, thus improving water quality and reducing nitrogen loads by promoting denitrification.

In environmental biotechnology, new concepts are currently being developed to employ microalgae to recover phosphor and nitrogen from sewage and reintroduce them into the nutrient cycle by means of organic fertilizers.

However, by year 3, the scientists» measurements indicated that the wetland had become a net source of dissolved organic nitrogen — the type that plants release — in water flowing into an adjacent estuary.

This happened despite the fact that both groups of plants took in the same amount of nitrogen through their roots, suggesting that the plants fertilized with nitrate were having trouble converting the nitrogen in nitrate into a more useful, organic form.

Photosynthesis allows them to take in the latter directly from the air, but they have to procure nitrogen through their roots in the form of organic molecules like ammonia or urea.

«These harness the best of organic farming combined with new technologies to better monitor the nutritional status of soils and plants and to recycle waste and with the promise of new wheat varieties able to utilise soil nitrogen more efficiently.»

Among biogenic volatile organic molecules is a class of compounds called monoterpenes, which react with ozone, hydroxyl radicals, nitrogen oxides, and other gases in the atmosphere.

Yet they are still active, chemical reactors really, generating hydrogen and various toxic gases such as oxides of nitrogen and organic vapours.

Like vehicles and power plants, trees emit airborne chemicals called volatile organic compounds (VOCs), which in the presence of sunlight react with nitrogen oxides in vehicle fumes to form ozone, one of the components in smog that makes it a health threat.