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Sunday, April 19, 2020 | History

2 edition of Nitrate in the unsaturated zone under agricultural lands found in the catalog.

Nitrate in the unsaturated zone under agricultural lands

P. F. Pratt

Nitrate in the unsaturated zone under agricultural lands

  • 249 Want to read
  • 20 Currently reading

Published by U.S. Environmental Protection Agency]; for sale by the Supt. of Docs., U.S. Govt. Print. Off. in [Washington .
Written in English

    Subjects:
  • Nitrogen fertilizers.,
  • Nitrification.,
  • Leaching.

  • Edition Notes

    Statementby P. F. Pratt. [Prepared] for Research and Monitoring, Environmental Protection Agency.
    SeriesWater pollution control research series
    ContributionsUnited States. Environmental Protection Agency. Office of Research and Monitoring.
    Classifications
    LC ClassificationsS651 .P82
    The Physical Object
    Paginationvii, 45 p.
    Number of Pages45
    ID Numbers
    Open LibraryOL5391032M
    LC Control Number72602420

    Key results: This exploratory analysis suggests that a reduction of greater than 25% in the river nitrate loads from dairy-farming areas could potentially be achieved by spatially aligning dairy land with areas of high subsurface nitrate-attenuation capacity, and by managing critical flow pathways using innovative edge-of-field technologies Author: Ranvir Singh, David J. Horne. Shallow aquifers of coastal and internal alluvial plains of developed countries are commonly characterized by the challenging management of groundwater resources due to the intense agricultural and industrial activities that determine a high risk of groundwater contamination. Among the principal origins of pollution in these areas are agricultural practices based on the Author: Francesco Fusco, Vincenzo Allocca, Silvio Coda, Delia Cusano, Rita Tufano, Pantaleone De Vita. natural to rainfed (nonirrigated) agricultural ecosystems in the SHP. Unique aspects of this study include the focus on ClO 4-mobilization rather than distribution, which was evaluated in a previous study (6), focus on unsaturated zone profiles (10 profiles) linking land surface and groundwater ClO 4-concentrations, with emphasis on rainfed. of chloride and nitrate fronts. Thick unsaturated zones contain a reservoir of salts that are readily mobilized under increased recharge related to LU/LC changes, potentially degrading groundwater quality. Sustainable land use requires quantitative knowledge of the linkages between ecosystem change, recharge, and groundwater quality.

    Groundwater pollution (also called groundwater contamination) occurs when pollutants are released to the ground and make their way down into type of water pollution can also occur naturally due to the presence of a minor and unwanted constituent, contaminant or impurity in the groundwater, in which case it is more likely referred to as contamination rather .


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Nitrate in the unsaturated zone under agricultural lands by P. F. Pratt Download PDF EPUB FB2

NITRATE IN THE UNSATURATED ZONE UNDER AGRICULTURAL LANDS by P. Pratt Department of Soil Science and Agricultural Engineering University of California Riverside, California for Research and Monitoring ENVIRONMENTAL PROTECTION AGENCY Project No. DOE April, For sale by the Superintendent of Documents, U.S.

The present investigation was undertaken to determine the potential contribution of fertilizer N use on citrus and row crops to the NO₃̄ in ground waters in the Santa Ana River Basin of Southern California where a deep unsaturated zone exists between the soil profile or crop-root zone and the water table or saturated zone.

agricultural production, much of this nitrogen is released into the environment as nitrate. The purpose of this study was to quantify vertical transport rates of nitrate below agricultural fields, specifically looking at transport rates: 1) associated with normal opposed to wet soil conditions; 2) below soybean compared to corn fields; 3) based on.

Total nitrate amount stored in the – m unsaturated zone for the soil under pasture was 46 kg ha −1, a value considered here as the baseline for the unsaturated zone. A concentration of kg ha −1 of NO 3 − –N in the unsaturated zone was found under corn receiving kg/ha of N and mm of by: Nitrate contamination of a rural aquifer and accumulation in the unsaturated zone Article in Agricultural Water Management 57(1) February.

leaches below the root zone and is eventually transported as nitrate through the unsaturated zone to the water table. A lag time of years to decades between processes occurring in the root zone and their final imprint on groundwater quality pre-vents proper decision-making on land use and groundwater-resource by: The unsaturated zone (USZ) is the pathway for water and contaminants from the land surface to groundwater, and in arid, and semi-arid USZs there is variability in both nitrate concentrations and the extent to which it is accumulating or being flushed through to by:   Nitrate (NO3) profiles in semiarid unsaturated zones archive land use change (LUC) impacts on nitrogen (N) cycling with implications for agricultural N management and groundwater quality.

This study quantified LUC impacts on NO3 inventories and fluxes by measuring NO3 profiles beneath natural and rainfed (nonirrigated) agricultural ecosystems in Cited by: The nitrogen and oxygen isotopic compositions of nitrate in pore water extracts from unsaturated zone (UZ) core samples and groundwater samples indicate at least four potential sources of nitrate in groundwaters at the U.S.

DOE Hanford Site in south-central Washington. Natural sources of nitrate identified include microbially produced nitrate from the soil column (δ15N of Cited by: The role of the unsaturated zone in determining nitrate leaching to groundwater. Chapter and ammonia volatilization in agricultural lands.

The new indices are. The derived unsaturated zone thickness ranges between 0 and m with an average of 52 m. Close examination of the unsaturated zone thickness map indicates that thicker unsaturated zones are located at the center of the aquifer outcrops (Figure 5), where the land cover is mainly forest (Figure 4).Cited by: Nitrate in the unsaturated zone under agricultural lands, by P.

Pratt. [Prepared] for Research and Mo Essais de nitrate de soude: experiences d'engrais; Nitrogen isotopes in nitrate from surface water and shallow groundwater at Sixmile Creek, southeastern C.

1 UK Groundwater Forum. The Nitrate Problem. Nitrogen is an essential plant nutrient: some plants fix atmospheric nitrogen but modern farming practice involves the addition of nitrogen in the form of manure, sewage sludge and chemical Size: KB.

Nitrate is considered the most common non-point pollutant in groundwater. It is often attributed to agricultural management, when excess application of nitrogen fertilizer leaches below the root zone and is eventually transported as nitrate through the unsaturated zone to the water table.

This book builds on Farming, Fertilizers and the Nitrate Problem (CABI, ) by Addiscott, Whitmore and Powlson but has been restructured to take account of new developments and to bring out more clearly the role of politicians and economists in the "nitrate problem".Cited by: A nitrate vulnerable zone is a conservation designation of the Environment Agency for areas of land that drain into nitrate polluted waters, or waters which could become polluted by nitrates.

Nitrate vulnerable zones were introduced by the UK government in response to the EU mandate that all EU countries must reduce the nitrate in drinking water to a maximum of 50 mg/l. Regional Variability of Nitrate Fluxes in the Unsaturated Zone and Groundwater, Wisconsin, USA 3 fluxes in the unsaturated zone and groundwater across agri- Wendland et al., ), and that conversion of natural ecosystems to agricultural land causes increased fluxes of N to the subsurface (Scanlon et al., ; Secchi et al., Cited by:   1.

Introduction. Nitrogen levels in surface water and groundwater of agricultural lands have increased by 50% over the past two decades as a result of increases in the use of fertilizers and manure [1, 2].As the nation with the largest agricultural production, China consumed 23 million tons of fertilizer N inaccounting for about 28% of total world N Cited by: ), defi ned here as the subroot portion of the unsaturated zone.

Th e major focus of this paper is to examine the fate and transport of N in the deep unsaturated zone beneath fi ve agricultural settings. For agricultural lands, the soil N balance and speciation of N in the unsaturated zone is often poorly understood (Jenkinson, ).

Nitrate in groundwater and the unsaturated zone in (semi)arid northern China: baseline and factors controlling its transport and fate Environmental Earth Sciences Modeling vulnerability of groundwater to pollution under future scenarios of climate change and biofuels-related land use change: A case study in North Dakota, USA.

The aim of the research was to determine how changes in the management of agricultural land (cultivation techniques, fertilisation, type of crop and crop rotation) influence on the leaching of nitrogen from the soil profile.

Research was conducted in the Drava River plain in Slovenia. The impact of 31 different scenarios of potential change in agricultural land management was Cited by: 1. Thick unsaturated zones contain a reservoir of salts that are readily mobilized under increased recharge related to LU/LC changes, potentially degrading groundwater quality.

Sustainable land use requires quantitative knowledge of the linkages between ecosystem change, recharge, and groundwater by: in the nitrate issue from a strictly “water” perspective, since water is the primary driving mechanism that moves nitrates towards our ground and surface water resources.

A brief review of the hydrologic cycle and water budget will be given and factors to keep in mind in assessing nitrate results in the unsaturated zone. land as well as the tilling of the soil which enhances the nitrification of soil organic nitrogen.

Depending on the conditions in the unsaturated zone and in the aquifer, denitrification, i.e. may have significant nitrate levels. Therefore, under natural conditions significant loss of.

Overuse of fertilizers in agriculture could cause groundwater nitrate pollution. However, this is related to nitrate input, soil moisture movement (direction and rate), and depth of water table in (semi)arid areas, where nitrate can be preserved and nitrate loss by denitrification can be limited.

A m soil profile to water table in Daxing, Beijing shows that the nitrate is accumulated in the Author: Su Fen Wang, Tian Ming Huang, Ji Lai Liu, Yu Long Liu.

The textural characteristics of soil unsaturated zone in the shallow groundwater distribution area was the key determining factor for controlling soil NO(3-)-N leaching and groundwater nitrate pollution.

The newly cultivated sandy croplands were the nitrate vulnerable zones and high-risk areas of groundwater nitrate by: 5.

However, the nitrate recently found is within a few meters of land surface and below the biologically active root zone. Contrary to conventional wisdom, small amounts of naturally occurring nitrate appear to have been leaching from soil layers and accumulating for thousands of years in the unsaturated zones of arid regions.

A small field site adjacent to a lake in Amana, Iowa was used to investigate the fate of nitrate fertilizer in the unsaturated zone. The fertilizer was applied to a barren plot, a plot planted with corn, and a plot planted with deep‐rooted poplar trees (Populus spp.) to study the characteristic behavior of a typical agricultural environment and a novel pollutant‐interception technique in.

Paramasivam S, Alva AK, Fares A, Sajwan KS () Fate of nitrate and bromide in an unsaturated zone of a sandy soil under citrus production. J Environ Qual – Google Scholar Pathak H, Nedwell DB () Strategies to reduce nitrous oxide emission from soil with fertilizer selection and nitrification by: 7.

Journal of Environmental Quality Abstract - Deep Nitrate Movement in the Unsaturated Zone of a Simulated Urban Lawn View My Binders This article in JEQ While leachates from N fertilizers applied to agricultural lands can impact the water quality in municipal wells, there is also the potential for leachates from turfgrass fertilizers to be.

Storage and mobilization of natural and septic nitrate in thick unsaturated zones, California. Mobilization of natural and septic nitrate from the unsaturated zone as a result of managed aquifer recharge has degraded water quality from public-supply wells near Yucca Valley in the western Mojave Desert, California.

Zhang, J. et al. Agricultural land use affects nitrate production and conservation in humid subtropical soils in China. Soil Biol. Biochem. 62, – (). Google ScholarCited by: Year Published: Unsaturated zone CO2, CH4, and δ13C-CO2 at an arid region low-level radioactive waste disposal site.

Elevated tritium, radiocarbon, Hg, and volatile organic compounds associated with low-level radioactive waste (LLRW) at the USGS Amargosa Desert Research Site (ADRS) have stimulated research on factors and processes that affect contaminant gas.

The main physical and chemical controls on nitrogen (N) fluxes between the root zone and the water table were determined for agricultural sites in California, Indiana, Maryland, Nebraska, and Washington from to Sites included irrigated and nonirrigated fields; soil textures ranging from clay to sand; crops including corn, soybeans, almonds, and pasture; and unsaturated zone.

U.S. farmers embraced nitrogen-based fertilizer at a dramatic pace during the s and '70s. Since then, its use has played a key role in boosting agricultural productivity. But as a consequence, nitrogen's more soluble form, nitrate, has become a common drinking water contaminant, in Wisconsin and around the country.

Aerobic soils are an important sink for methane (CH4) contributing up to 15% of annual global CH4 destruction. However, the sink strength is significantly affected by land management, nitrogen (N) fertilizers and acidity.

We tested these effects on samples taken from the Broadbalk Continuous Wheat, Park Grass permanent grassland and Broadbalk and Cited by:   Scanlon B R, Reedy R C and Bronson K F Impacts of land use change on nitrogen cycling archived in semiarid unsaturated zone nitrate profiles, southern High Plains, Texas Environ.

Sci. Technol. 42 – Crossref Google ScholarCited by: The total nitrate loads from unsaturated zone to the shallow aquifer were predicted to an optimal emission concentration range between mg N L-1 and mg N L-1 under varies nutrient reduction planning in Damao grassland.

The study used Vadose Zone Monitoring System technology developed at BGU and commercialized by Sensoil Innovations Ltd. to compare the water quality across the entire unsaturated zone under. Nitrogen levels in surface water and groundwater of agricultural lands have increased by 50% over the past two decades as a result of increases in the use of fertilizers and manure [1, 2].

As the nation with the largest agricultural production, China consumed 23 million tons of fertilizer N inaccounting for about 28% of total world N. Nitrate in Jersey’s Groundwater: Results of unsaturated zone pore-water profiling Chilton, PJ and Bird, MJ, BGS Technical report (WD/94/65) This research was carried out for the States of Jersey by BGS.

The results indicate a clear relationship between unsaturated zone nitrate concentrations and land use.The impact of agricultural chemicals on groundwater quality depends on the interactions of biogeochemical and hydrologic factors.

To identify key processes affecting distribution of agricultural nitrate in groundwater, a parsimonious transport model was applied at 14 sites across the U.S.

Simulated vertical profiles of NO3- N2 from denitrification, O2, Cl- and .Solute import–export dynamics in groundwater (GW) systems interacting with surface-water are complex, particularly under farming systems receiving high fertiliser/pesticide inputs in high rainfall regions.

We investigated whether any linkage existed between nitrate-N in: (i) leachate (LC) collected at ~1 m depth under banana (Musa) and that in GW, and (ii) GW and drain Cited by: