Flow and patterns of nitrate pollution in groundwater: a case study of an agricultural area in Tsukuba City, Japan

Gallardo, Adrián; Reyes-Borja, Walter Oswaldo; Tase, Norio

doi:10.1007/s00254-005-0029-8

Cited by 20 publications

(10 citation statements)

References 13 publications

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“…According to Waterloo Hydrogeologic Inc. () and Gallardo et al . (), NRMSE values less than 10% are considered acceptable, which is satisfied by the model estimation. Finally, NOF and NSC values are close to 0.0 and 1.0, respectively, indicating once again satisfactory groundwater model performance.…”

Section: Resultsmentioning

confidence: 99%

“…The R 2 value approached satisfactorily 1.0 as it was 0.9897, indicating satisfactory groundwater model performance (Boonstra and Deridder, 1981). According to Waterloo Hydrogeologic Inc. (2007) and Gallardo et al (2005), NRMSE values less than 10% are considered acceptable, which is satisfied by the model estimation. Finally, NOF and NSC values are close to 0.0 and 1.0, respectively, indicating once again satisfactory groundwater model performance.…”

Section: Modflow Simulation Development Calibration and Verificationmentioning

confidence: 99%

See 1 more Smart Citation

Integrated modeling as a decision‐aiding tool for groundwater management in a Mediterranean agricultural watershed

Pisinaras

Petalas

Tsihrintzis

et al. 2012

Hydrological Processes

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A decision‐aiding methodology for agricultural groundwater management is presented; it is based on the combination of a watershed model, a groundwater flow model, and an optimization model. This methodology was applied to an agricultural watershed in northeastern Greece. The watershed model used was the Soil and Water Assessment Tool (SWAT), which provided recharge rates for the aquifers. These recharge rates were imported in the well‐known MODFLOW groundwater flow model. Both models were calibrated and verified using field data. Then, the nonlinear optimization problem was solved by a piecewise linearization process, in which the Simplex algorithm was applied sequentially. Apart from several pumping and climate change sensitivity scenarios, a land use change scenario and a climate change scenario, combining the three models, were tested, showing the ability of this methodology to be used in the decision‐making process. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 99%

Section: Modflow Simulation Development Calibration and Verificationmentioning

confidence: 99%

Integrated modeling as a decision‐aiding tool for groundwater management in a Mediterranean agricultural watershed

Pisinaras

Petalas

Tsihrintzis

et al. 2012

Hydrological Processes

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“…Surface runoff from agricultural pesticides has also contributed to the degradation of water quality and increased toxicity to aquatic organisms (Okamura et al 2002;Iwafune et al 2011). In addition, intensive fertilizer use has significantly increased nitrate concentrations in groundwater near tea plantations, orchards, vegetable fields, and livestock farms, including those areas in close proximity to urban centers (Kumazawa 2002;Gallardo et al 2005).…”

Section: Environmental Impacts and Public Health Risksmentioning

confidence: 99%

Strawberry fields forever? Urban agriculture in developed countries: a review

Mok

Williamson

Grove

et al. 2013

Agron. Sustain. Dev.

374

246

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Food production in cities has long been a tradition in many countries around the world and a mainstream activity for many developed countries. While urban agriculture plays an important role in increasing food security and social well-being, it comes with significant costs and constraints. Here, we review the growth of urban agriculture throughout the developed world in order to clarify the different benefits, risks, and hindrances associated with the practice. Through this analysis, we identify the need for better understanding of the following five aspects if urban agriculture is to make a meaningful contribution to food security and social well-being in the future: (1) the impacts of continued urban sprawl and loss of peri-urban agricultural land; (2) appropriate government and institutional support at local, regional, and country levels; (3) the role of urban agriculture in self-sufficiency of cities; (4) the risks posed by pollutants from agriculture to urban ecosystems and from urban ecosystems to agriculture; and (5) the carbon footprint of urban agriculture and use of "food miles." If urban agriculture is to have a legitimate place in resolving the global food crisis as advocates claim, then it is time to take urban agriculture seriously and assess more rigorously both the positive and negative impacts, especially carbon emissions. Only then can the world's limited resources be properly allocated to the development of urban agriculture.

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“…Given the magnitude of the area, it is logical to conclude that all production activities undertaken there could have an impact on groundwater, particularly N management. Agricultural production systems represent an important and ongoing source of nitrates in groundwater (Oenema et al, 2005;Jalali, 2005;Beaudoin et al, 2005;Gallardo et al, 2005) affecting the quality of drinking water, particularly in rural areas (Chen et al, 2004). In view of the adverse effects of nitrates on human health and on the environment, and given that global demand for N fertilizer is dictated by cereal grain production where three main grain crops (rice, corn, and wheat) account for 56% of world N fertilizer consumption (Cassman et al, 2003), it is imperative to improve its use efficiency in order to reduce groundwater nitrate loads.…”

Section: Resultsmentioning

confidence: 99%

Quantifying Nitrate Leaching in Irrigated Wheat with Different Nitrogen Fertilization Strategies in an Alfisol

Claret

Urrutia

Ortega

et al. 2011

Chilean J. Agric. Res.

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Consumption of water contaminated with nitrates is associated with important health effects such as methemoglobinemia and gastric cancer. Intensive agriculture, which uses large quantities of N fertilizer, is the main source of nitrates in water systems. There are several strategies to reduce leaching and increase Nitrogen Use Efficiency (NUE). An experiment was conducted with spring wheat (Triticum aestivum L.) under sprinkler irrigation (center pivot) to determine if adjusted N applications using precision agriculture tools and plant demand resulted in a lower groundwater nitrate load. Evaluated treatments were: producer fertilization (Pr), precision agriculture (Pa), chlorophyll meter (Sm), and control without N (W/N). The ceramic capsule methodology was used to evaluate N leaching losses that were sampled after each irrigation (six) and drainage water was also estimated. Differences among treatments in terms of N loss and grain yield were not significant (p > 0.05). However, N balance showed significant differences (p < 0.01) in soil residual N among treatments. A regression between applied and residual soil N after harvest showed that N, applied as fertilizer, explained 98% of residual soil N variation, which would probably be leached in the following winter since the soil would be bare. It was concluded that NUE can be improved to result in a lower environmental load by using precision agriculture tools and considering plant N demand.

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Flow and patterns of nitrate pollution in groundwater: a case study of an agricultural area in Tsukuba City, Japan

Cited by 20 publications

References 13 publications

Integrated modeling as a decision‐aiding tool for groundwater management in a Mediterranean agricultural watershed

Integrated modeling as a decision‐aiding tool for groundwater management in a Mediterranean agricultural watershed

Strawberry fields forever? Urban agriculture in developed countries: a review

Quantifying Nitrate Leaching in Irrigated Wheat with Different Nitrogen Fertilization Strategies in an Alfisol

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