Potentially mineralizable nitrogen and nitrate leaching under different land‐use conditions in western Nebraska.

Saint‐Fort, Roger; Schepers, James S.; Spalding, Roy F.

doi:10.1080/10934529109375639

Cited by 4 publications

(7 citation statements)

References 9 publications

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“…5e For all feedlots, Cl − ranged from about 800 to 14,000 mg kg −1 at the surface, rapidly decreased within 1.0 m to approximately 400 mg kg −1 , and continued to decrease to <50 mg kg −1 in most pens. Saint‐Fort et al (1991) observed similar Cl − behavior as found at these feedlots. The Cl − distribution was consistent with diffusion based transport through a hardened barrier and seepage of 0.085 mm d −1 (Jang and Hong, 2002).…”

Section: Resultssupporting

confidence: 82%

Nutrient Accumulation below Cattle Feedlot Pens in Kansas

et al. 2009

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Waste excreted on cattle (Bos taurus) feedlot pens is a source of N and other nutrients that could potentially leach into soil and negatively impact local groundwater quality. Analyses of soil chemical and physical properties beneath active open air feedlot pens were conducted at four Kansas locations to determine nutrient accumulation. Results were compared to estimated nutrient deposition, and remediation implications were considered. The surface concentrations of NH(4)-N, organic N, organic C, Cl(-), and extractable P were elevated at the surface and rapidly decreased with depth to 1.0 m. Ammonium N in the top 0.25 m ranged from 8000 to 375 mg kg(-1) but decreased below background (5.6 mg kg(-1)) at 1.0 to 1.3 m. Organic N in the top 0.25 m ranged from 22,000 to 500 mg kg(-1) and was the largest N source. At three of four feedlots, NO(3)-N was below background concentration (4.1 mg kg(-1)) for the entire profile whereas one feedlot had a >75 mg kg(-1) increase from the background concentration in the top 1.0 m. Considering expected nutrient deposition onto the pen surface only a fraction of the nutrients were found beneath feedlot pen surfaces. While in use, these feedlots do not appear to have a high potential for groundwater contamination from NO(3)-N leaching. However, if they were to become inactive NO(3)-N may increase and could leach into groundwater. Upon closing of the feedlots, the land could be largely remediated by removing the top 0.25 m of pen surface, a zone holding 48% of total profile N.

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Section: Resultssupporting

confidence: 82%

Nutrient Accumulation below Cattle Feedlot Pens in Kansas

et al. 2009

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“…Surely, sizeable amount of N were and will be removed by leaching and/or denitrification. The cropfield appeared to have significant amount of NO3-N in transition (Figure 3) which paralleles a similar pattern reported by Saint-Fort et al [3]. It is generally recognized that nitrate in excess of crop requirement, regardless of the source is subject to leaching or other dynamic processes.…”

Section: Resultssupporting

confidence: 62%

“…Less noticeable, however, are the potential accumulation and subsequent leaching of nutrients, mainly nitrate (NO 3 -). dissolved organic and chloride (C1 -) that have the potential of contaminating shallow ground water [1] [3] [2]. The amount of contaminants reaching a ground water system under a feedlot or amended field will be dictated by the interplay of past and current management practice, site characteristics, redox potentials with depth, climatic conditions, and the nature of the chemical as well as the organic waste.…”

Section: Introductionmentioning

confidence: 99%

Subsurface environmental quality under a cattle feedlot and adjacent Cropfield

Saint‐Fort

Raina²,

Prescott³

1995

Journal of Environmental Science and Health . Part A: Environme

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The dynamic systems under consideration is complex. The behaviour and fate of chemicals in a feedlot environment and cropfield are affected by interactive variables such as environmental factors, management practice, landscape, nitrogeneous waste types, site physical/chemical/ biological properties. The purpose of this study was to ascertain the subsurface environmental quality under a cattle feedlot and manured adjacent cropfield. Soil cores from differently managed pens and a cropfield were parametized for key chemical and physical properties. The cropfield has been manured for 20 years and fertilized with N at recommended rate of 120 kg ha -1 . The average amount of autoclave labile-N in the top 25-cm varied with soil cores and ranged from 30 to 67 mg kg -1 and decreased significantly beyond the 0.50-m depth in all soil profiles. Average total NO 3 -N loading in the vadose associated with pen-A, pen-B, pen-C and the cropfield was 58, 123, 212, and 234 mg kg -1 , respectively.

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Section: Discussionmentioning

confidence: 99%

“…Study of the geographic distribution of factors limiting herbage production is also a possible application. For example, intensive pasture management can give rise to nutrient leaching in ground and surface waters (Saintfort et al, 1991;Foy and Kirk, 1995;Williams, Figure 10 Example of temporal profiles of the yield according to the mechanistic model in four points sampled in Scotland according to a stratified-random scheme: (a) north (total herbage production, 11 617 kg DM ha )1 ), (b) south-east (total herbage production, 11 715 kg DM ha )1 ), (c) north-east (total herbage production, 9367 kg DM ha )1 ) and (d) south-west (total herbage production, 10 671 kg DM ha )1 ). et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

Scaling up of a mechanistic dynamic model in a GIS environment to model temperate grassland production at the regional scale

Gimona¹,

Birnie²,

Sibbald³

2006

Grass and Forage Science

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Regional-scale ecological processes are mediated by processes occurring at local scales. Spatially explicit models are needed to understand the broad-scale consequences of a large number of local processes, driven by factors which are heterogeneous at a broad scale. A Geographic Information System (GIS)-based mechanistic model, which can be used as a flexible tool to investigate the regional-scale effects of changes in environmental factors on herbage production from a Lolium perenne sward, was developed and used to investigate the consequences of aggregating driving variables at different resolutions. The model allows rigorous scaling up of previously existing field-based modelling approaches within a GIS context. The model's mechanistic approach allows flexibility in the simulation of the separate effects of environmental driving variables and of cutting regimes. The driving variables (temperature, solar radiation, available soil moisture and soil nitrogen status) are scaled up using geostatistical techniques. The model is used to evaluate weekly changes in herbage production under environmental conditions, variable both in space and time, under different cutting regimes. It is shown that, in this model, aggregation at 1 km 2 is a good compromise between accuracy and practical feasibility, and that, while ignoring heterogeneity over many square kilometres can induce large errors, their magnitude and direction also depend on the model response curve to an input variable. The results obtained were consistent with the known trends in influential environmental factors. The programming within a GIS makes the model flexible in its application and, therefore, makes it easy to apply at a variety of scales.

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Potentially mineralizable nitrogen and nitrate leaching under different land‐use conditions in western Nebraska.

Cited by 4 publications

References 9 publications

Nutrient Accumulation below Cattle Feedlot Pens in Kansas

Nutrient Accumulation below Cattle Feedlot Pens in Kansas

Subsurface environmental quality under a cattle feedlot and adjacent Cropfield

Scaling up of a mechanistic dynamic model in a GIS environment to model temperate grassland production at the regional scale

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