Sentences with phrase «of nitrogen fertilizer»

Control: Maintain a uniform supply of soil moisture through irrigation and avoid large amounts of nitrogen fertilizer.

The use of nitrogen fertilizers in farming is increasing the rate at which nitrous oxide is being added to the atmosphere.

Normally, Ortner said, farmers use about 200 pounds of nitrogen fertilizer per acre, but now he's down to about 135 pounds per acre on the test plot.

Their results showed that farmers there use about 525 pounds of nitrogen fertilizer per acre (588 kilograms per hectare) annually — releasing about 200 pounds of excess nitrogen per acre (227 kilograms per hectare) into the environment.

The application of nitrogen fertilizers accounts for the majority of N2O emissions in the United States.

Developing and demonstrating practical methods of rebuilding natural soil fertility became J.I. Rodale's primary goal when World War II's sudden shortage of nitrogen fertilizer — as it was diverted to making munitions — exposed the natural nutrient poverty of the nation's soil.

In 2011, the U.S. Department of Agriculture reported that 12.8 billion tons of nitrogen fertilizer costing more than $ 800 million were added to fields that produce corn, cotton, grains and other commodity crops.

Studies show that only about 30 percent of the nitrogen fertilizers used in agriculture are actually taken up by the crops they are intended to feed.

«For every pound of nitrogen fertilizer manufactured, at least 10 pounds of carbon dioxide may be released,» Hungria states.

Farmers raising a nitrogen - hungry crop like sweet corn may save up to half of their nitrogen fertilizer cost.

We are particularly interested in their symbioses with N2 - fixing cyanobacteria, which provide plants with their own source of nitrogen fertilizer.

On April 19, 1995, an unemployed security guard with an antigovernment vendetta detonated more than two tons of nitrogen fertilizer mixed with fuel at the Alfred P. Murrah Federal Building in Oklahoma City, killing 168 people.

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.

That findings suggests that regions with greater inputs of nitrogen fertilizer will also see greater soil emissions — and that the emission of NOx gases from the soils will also increase as temperatures rise in the region due to climate change.

Simulations revealed that California's Central Valley had the highest emissions of NOx gases from soils in the state (left), closely matching the regions with the highest rate of nitrogen fertilizer use (right).

Its significance is so important today because food production for more than half of the world's people can only be guaranteed with the aid of nitrogen fertilizers.

The research, conducted by Bayani Cardenas, associate professor of hydrogeology, and Brian Kiel, a Ph.D. candidate in geology at the university's Jackson School of Geosciences, provides valuable information to those who manage water quality efforts, including the tracking of nitrogen fertilizers used to grow crops in the Midwest, in the Mississippi River network.

In an earlier study, he and his colleagues found that Chinese farmers use an average of around 600 kilograms of nitrogen fertilizers per hectare per year, but that could be cut by up to two - thirds without affecting crop yields.

He agrees that the acidifying effects of nitrogen fertilizer deserve more attention in China.

But overuse of certain types of nitrogen fertilizer is another cause, and this is what the researchers identify as the culprit in China.

But yields from a grass that only needs to be planted once would deliver an average of 13.1 megajoules of energy as ethanol for every megajoule of petroleum consumed — in the form of nitrogen fertilizers or diesel for tractors — growing them.

Heavy use of nitrogen fertilizers on farms, for example, allows more ammonia to run off into the oceans.

They believed that applications in western Canada were less likely, given the relatively good efficiency of nitrogen fertilizer use in this region (by such techniques as banding).

In one study in South Dakota, placement of nitrogen fertilizer in the surface layer of soil led to higher emissions of nitrous oxde from zero till compared to convention till.

The same experiments could also measure nitric oxide emissions.Problems associated with the rapidly growing use of nitrogen fertilizers worldwide are becoming a major environmental issue.

The cover crops and manure have allowed the farm to reduce its use of nitrogen fertilizer by about 10 percent.

While orange juice is already known for its massive carbon footprint, largely a result of nonorganic groves using a lot of nitrogen fertilizers, the risk of losing this crop entirely and having to import it from abroad would seem an even bigger problem.

In terms of synthetic and mined fertilizers, the corn crop sucks in nearly 40 percent of all nitrogen fertilizer applied in the United States, and upwards of 30 percent of phosphorous and potash.

Rice grown at 600 ppm CO2 increased its grain yield by 28 % with low applications of nitrogen fertilizer, Chinese scientists calculated.

An analysis of any food item must include the degree of processing, transportation mode and distances, presence of red meat, amount of nitrogen fertilizer used, manure application, and storage method.

Developing and demonstrating practical methods of rebuilding natural soil fertility became J.I. Rodale's primary goal when World War II's sudden shortage of nitrogen fertilizer — as it was diverted to making munitions — exposed the natural nutrient poverty of the nation's soil.

Ammonia is a vital source of nitrogen fertilizer.

In a 2004 study in western Kenya, a co-author, Pedro Sanchez, and colleagues found that farmers used only about 6 pounds of nitrogen fertilizer per acre (7 kilograms per hectare)-- little more than 1 percent of the total used by Chinese farmers.

The use of nitrogen fertilizers in agriculture is associated with high emissions of nitrous oxide.

Resource - conserving cropping practices from WHEAT, such as more targeted use of nitrogen fertilizers or sowing wheat into untilled soils and crop residues, can raise wheat farmers» incomes while curbing greenhouse gas emissions, if widely adopted, he added.

Brazil imports about 70 % of the nitrogen fertilizers used in the country.

Since the 1980s, the use of nitrogen fertilizers and the number of livestock have doubled, whereas coal consumption has increased more than 3-fold and the number of motor vehicles more than 20-fold.

EWG estimates that growing livestock feed in the U.S. alone requires 167 million pounds of pesticides and 17 billion pounds of nitrogen fertilizer each year across some 149 million acres of cropland.

Water is a major concern, as is the use of nitrogen fertilizers to stimulate growth of cyanobacteria and microalgae — two microorganisms typically lumped together as algae biofuels.

The need to address uncertainties applies to other areas the analysis as well, and we urge you to evaluate the increasing use of nitrogen fertilizers and herbicides associated with greater biofuel production.

Mr. Zhang and his co-workers also demonstrated that use of nitrogen fertilizer could be halved without loss of yield or grain quality, reducing nitrogen losses by more than 50 percent in the process.

These changes in land use would be expected to reduce carbon dioxide emissions from soils, and increase carbon sequestering by means of an increase in soil organic matter.However, this reduction in amount of land in summerfallow, and an increase in land in crop, has been accompanied by an increase in use of nitrogen fertilizers.

An agronomist with the company reported to us that their main interest in such fertilizers was for applications in developing and / or tropical countries, where present use of nitrogen fertilizers is, in many cases, relatively inefficient (e.g., rice production).

Nitric oxide (NO) can also be emitted from crop production systems, and is related to the amount of nitrogen fertilizer used.

«The MSU - EPRI methodology allows farmers to be paid to reduce their use of nitrogen fertilizer, while assisting other carbon market participants to reduce emissions more cost effectively than otherwise would be possible,» said Adam Diamant, technical executive at EPRI and a co-author of the new ACR methodology.

The use of nitrogen fertilizers is the second largest source of greenhouse gas emissions in Switzerland's agricultural sector.