Nitrate contamination of groundwater: Measurement and prediction

Goss, M. J.; Goorahoo, Dave

doi:10.1007/978-94-009-1706-4_31

Cited by 18 publications

(12 citation statements)

References 13 publications

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“…This approach was based on the field N balance approach assuming no soil N accumulation. The field N balance was confirmed as equivalent to nitrate leaching in Europe (for example, Barry et al 1993;Goss and Goorahoo 1995). Our study area revealed remarkable characteristics for nitrate leaching and negligible surface runoff, such as shallow soil depth, rapid water drainage through cracks in limestone, without rivers, and without paddy fields.…”

Section: And the Common Values In Food Compositionmentioning

confidence: 79%

Nitrogen Cycling with Respect to Environmental Load in Farm Systems in Southwest China

Lei

Nagumo

Hatano

2005

Nutr Cycl Agroecosyst

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In Qibainong, a steep-mountainous karst region in southwestern China, self-sustaining societies have long existed, but increasing socioeconomic liberation has fuelled the recent rapid structural change of its economy. Consequently, environmental deterioration and exhaustion of resources have become problematic issues. We carried out a field survey in Qibainong in southwestern China and used both estimated and measured N flows and N balances from obtained results. Our results are summarized as follows (1) farmers used large amounts of chemical N fertilizers at intensities of 113-1124 kg N ha À1 ; (2) substantial application of chemical fertilizer in Qibainong has contributed to an increase in potential NO 3 -N leaching of 6-511 kg N ha À1 , followed by NH 3 volatilization; (3) crop products are largely distributed to feed livestock, the products of which are a major income source; (4) this area has a great requirement for imported food; (5) in addition, unused manure N (up to 191 kg N ha À1 ) is generated by the increase in manure N production. Chemical fertilizer application, in addition to unused manure can be regarded as a major source of environmental damage. Based on the relationship between the N application rate and the NO 3 -N leaching potential, we estimated the critical limit of the N application rate of chemical fertilizer + manure to be 297 kg N ha À1 . In Qibainong, unused manure, which is an important nutrient resource, was applicable within the critical limit. We recommend that all manure N produced within the village be used effectively on arable land, and that any shortages be supplemented by chemical N fertilizer up to 297 kg N ha À1 to maintain water resource quality. Further improvement might be achieved through incorporating chemical fertilizers, P and K supplemented manure, and so on.

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Section: And the Common Values In Food Compositionmentioning

confidence: 79%

Nitrogen Cycling with Respect to Environmental Load in Farm Systems in Southwest China

Lei

Nagumo

Hatano

2005

Nutr Cycl Agroecosyst

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“…The difference between the input and output reflects the N surplus inside the arable land, and consequently, the N load to the environment. This approach was based on the arable land N balance, which was confirmed equivalent to nitrate leaching in Europe (Barry et al 1993, Goss andGoorahoo 1995). The N surplus was estimated in arable land as the N load to the environment, and the result was multiplied with the N component ratio in organic material to estimate N flows.…”

Section: Estimation Methods Of the N Flowmentioning

confidence: 99%

Evaluation of nitrogen cycling associated with agricultural production and environmental load in a mountain region, in Hokkaido, Japan

Liang

Datian

2008

J. Mt. Sci.

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This study examined the nitrogen cycling associated with agricultural production and environmental load in central Hokkaido. The nitrogen (N) budget analysis model offers a new set of tools for evaluating N cycling in agro-ecosystems. The cycling index (CI) is a useful tool for estimating optimal N flows in farmlands. The fertilization index (FI) is a useful indicator for characterizing the N flows related to farms. Using these parameters, we analyzed all farm systems to estimate the optimal N cycling for minimizing N pollution in groundwater and maximizing agricultural production in mountain regions of Japan. The results showed that the critical N application rate (chemical fertilizer + manure) was 143.3 kg N ha -1 y -1 . The critical inter-system input (chemical fertilizer N, imported food and feed N, and natural supplied N) was 169.2 kg N ha -1 y -1 .

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“…Many writers have said that fertilizer residues are destructive to the environment. The residues are particularly harmful to the soil structure [5] and water resources quality [6,7]. Some rural farmers also believe that chemical fertilizer application on their farms pollute the rivers that provide their drinking water.…”

Section: Open Accessmentioning

confidence: 99%

Alley Farming in Thailand

Ogunlana

Noomhorm

Silakul³

2010

Sustainability

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Poverty alleviation and environmental preservation are very important issues to many governments. Alley farming is beneficial to the environment because it conserves soil and sustains yields over time. Specifically, alley farming reduces soil erosion, which is a major problem in Thailand. Alley farming was conducted on a farmer's field at Khaokwan Thong, a village in Uthaithani Province, Northern Thailand. We did a two-by-two factorial with and without alley farming, and with and without fertilizer. From this study, we observed that the two species used, Leucaena leucocephala and Acacia auriculiformis, grow well in Thailand, and that alley farming is suitable for Thailand. Few Thai farmers have heard about alley farming. However, it is nevertheless useful to know that there is potential for alley farming in Thailand using the two species. These plants, based upon the diameter and height measurements provided, grew well.

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Nitrate contamination of groundwater: Measurement and prediction

Cited by 18 publications

References 13 publications

Nitrogen Cycling with Respect to Environmental Load in Farm Systems in Southwest China

Nitrogen Cycling with Respect to Environmental Load in Farm Systems in Southwest China

Evaluation of nitrogen cycling associated with agricultural production and environmental load in a mountain region, in Hokkaido, Japan

Alley Farming in Thailand

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