Sentences with phrase «of nitrogen input»

Not exact matches

Farmers are earning huge profits on their wheat, soybeans, cotton and other crops; strong demand for (and relatively tight supplies of) grain, oilseeds and other key food inputs encouraged them to use large volumes of fertilizer (notably potash, phosphate and nitrogen) to boost their crop yields.

The project will look for synergies between water and nitrogen inputs, quantifying the rate and timing of nitrogen supply through mineralization; assessing the cost effectiveness of enhanced efficiency fertilizers; and evaluating new digital, precision and spatial technologies.

The limited availability and input of nitrogen, the application of mechanical and thermal weed control and more diverse crop rotations and a higher crop diversity lead to more favourable conditions for many wild plant species.

Researchers in China studied the co-application of manures and chemical nitrogen fertilizers in high - input greenhouses.

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.

For U.S. farmers, he said, nitrogen makes up about 40 percent of their inputs: «That's not true around the world but we can improve that.

The increase in dead zones is attributed to excess inputs of nitrogen from fertilizers, sewage, and other human sources.

Waterbirds in general, and especially flamingos, input nitrogen and phosphorus (N and P) in wetlands by means of their feces.

Glaser et al. show that dust deposition mediated by frequent tropical storms was an important source of nutrients for the Everglades until about 2800 years ago, when a climatic shift in the tropical Atlantic and Gulf of Mexico led to weather patterns that sharply decreased the level of dust inputs and led to a drier climate and a gradual loss of soil phosphorus, carbon, and nitrogen.

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.

Human - accelerated eutrophication (known as cultural eutrophication) can be triggered by inputs of sewage, sludge, fertilizers, or other wastes containing nutrients such as nitrogen and phosphorus.

Integrate coral reef management with land - use and coastal zone planning and practices to reduce pollutant inputs (notably, ammonium compounds, nitrogen and sulphur oxides) that increase the acidity of local waters.

ref Specifically, reducing land - based sources of pollution (nutrient runoff and sedimentation) has been identified as an important approach to address acidification in coastal waters because nutrients like phosphorus and nitrogen and land - based carbon inputs can increase the acidity of coastal and oceanic waters.

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.

Human activity increases the amount of nitrogen that reaches the oceans by 50 %, on top of natural processes, according to a new report which assesses the magnitude and impacts of anthropogenic atmospheric nitrogen inputs to the ocean.

Before this study, the input of this nitrogen to the global land system was unknown.

While organic agriculture practices result in higher soil organic matter (SOM) contents and, in turn, higher nutrient - and water - supplying potential to crops, transition to organic farming typically involves a lag time of several years in which yields can suffer and input demands increase as rebuilding soil microbial communities compete with crops for nitrogen and other available nutrients (Simmons and Coleman, 2008).

Sustained harvesting of any biomass will require large inputs of nitrogen and other fertilizers; nitrogen fertilizer is a major cause of biodiversity decline and increasingly N2O emissions are recognized as a major contributor to climate change.

In experiment after experiment, scientists find that the CO2 fertilization effect is short - lived without additional inputs of nutrients, particularly nitrogen..

Conventional stockless arable farms depend on the input of synthetic nitrogen fertilizers, while stockpiled manure and slurry on livestock farms create additional emissions and other environmen - tal problems.

Corn is among the most intensive uses of fertilizer, both per acre and in total use, and represents a significant opportunity for nitrogen use efficiencies that could reduce emissions as well as farmers» input costs while maintaining yields.

Adaptation is further supported by increased agro-ecosystem diversity of organic farms, based on management decisions, reduced nitrogen inputs and the absence of chemical pesticides.

About 91 % of farmers are practicing the technology at different levels depending on the component adopted out of the six, namely minimum land tillage; laying out fixed planting basins; no burning of crop residues; planting and input application in basins; and rotation with nitrogen - fixing crops for soil fertility restitution, outlined by the Conservation Farming Unit (CFU).

Today's recipe is for «Gulf of Mexico Dead Zone»: Start with historically massive agricultural input of phosphorus and nitrogen into the Mississippi River system.

Ways to reduce fossil fuel inputs to food systems include the use of farm machinery powered by renewable electricity or farm - produced biofuels; the localization of food systems to reduce transport (perhaps entailing vertical urban agriculture); the adoption of organic and ecological production practices to reduce the need for nitrogen fertilizer, pesticides, and herbicides; and an overall reduction in the consumption of highly processed foods.

Inputs of organic matter, nitrogen and phosphorus to coastal ecosystems have increased greatly (Nixon 1995; Howarth et al. 1996; Conley 2000; Stedmon et al. 2006; Sharp 2010).