Nitrogen and phosphorus surpluses on Danish dairy and pig farms in relation to farm characteristics

Nielsen, Annelise; Kristensen, Ib Sillebak

doi:10.1016/j.livprodsci.2005.05.012

Cited by 77 publications

(65 citation statements)

References 11 publications

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“…Therefore, we find that these are conservative estimates and it seems therefore reasonable to use these estimates to assess differences in the emissions also. The findings were in agreement with studies on Danish pilot farms (Halberg et al, 1995;Halberg, 1999;Nielsen and Kristensen, 2005).…”

Section: Methodology: Establishment Of Farm Typessupporting

confidence: 92%

“…Holbeck and Hvid (2004), Hvid (2005a,b) and Kristensen et al (2004) analysed data from farms from 1999 to 2003, and found that the N surplus was higher from dairy farms in comparison with pig farms. This is also in accordance with our results and the results of Nielsen and Kristensen (2005).…”

Section: Farm Nutrient Balances and Emissionssupporting

confidence: 94%

“…In several studies (Jarvis and Aarts, 2000;Haas et al, 2001;Holbeck and Hvid, 2004;Jarvis and Menzi, 2004;Kristensen et al, 2005a;Nielsen and Kristensen, 2005) area-based indicators have been used to compare nutrient surpluses from different farm types. As data-collection from farms is time-consuming, these studies are based on a limited number of farms and are not statistically representative for the agricultural sector.…”

Section: Introductionmentioning

confidence: 99%

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Modelling representative and coherent Danish farm types based on farm accountancy data for use in environmental assessments

Dalgaard

Halberg²,

Kristensen³

et al. 2006

Agriculture, Ecosystems & Environment

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There is a need for valid and representative data on the production, resource use and emissions from different farm types in Denmark for public regulation and assessment. The data should be usable for both area-based environmental assessment (e.g. nitrate leaching per ha) and product-oriented environmental assessment (e.g. greenhouse gas emissions per kg pork). The objective of this study was to establish a national agricultural model for estimating data on resource use, production and environmentally important emissions for a set of representative farm types.Every year a sample of farm accounts is established in order to report Danish agro-economical data to the 'Farm Accountancy Data Network' (FADN), and to produce 'The annual Danish account statistics for agriculture'. The farm accounts are selected and weighted to be representative for the Danish agricultural sector, and similar samples of farm accounts are collected in most of the European countries. Based on a sample of 2138 farm accounts from year 1999 a national agricultural model, consisting of 31 farm types, was constructed. The farm accounts were grouped according to the major soil types, the number of working hours, the most important enterprise (dairy, pig, different cash crops), livestock density, etc. For each group the farm account data on the average resource use, products sold, land use and herd structure were used to establish a farm type with coherency between livestock production, feed use, land use, yields, imported feed, homegrown feed, manure production, fertilizer use and crop production. The set of farm types was scaled up to national level thus representing the whole Danish agricultural sector and the resulting production, resource use and land use was checked against the national statistics. Nutrient balance methodology and state-of-the-art emission models and factors were used to establish the emissions of nitrate, phosphate, ammonia, nitrous oxide, methane and fossil carbon dioxide from each farm type. In this paper data on resource uses and emissions from selected farm types are presented and it is demonstrated that this approach can lead to an agro-environmental inventory, which is consistent with national level estimates and still has the advantage of being disaggregated to specific farm types. Conventional dairy farm types in general emitted more nitrate but less phosphate compared with pig farm types. The methane emission was higher from dairy farm types compared with all other farm types. In general the conventional dairy farms emitted more nitrate, ammonia, and nitrous oxide, compared with organic dairy farms. #

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Section: Methodology: Establishment Of Farm Typessupporting

confidence: 92%

Section: Farm Nutrient Balances and Emissionssupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modelling representative and coherent Danish farm types based on farm accountancy data for use in environmental assessments

Dalgaard

Halberg²,

Kristensen³

et al. 2006

Agriculture, Ecosystems & Environment

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show abstract

“…Nutrient surpluses accumulate within the soil pools and improve soil fertility but may also pose a threat for environmental contamination (Nielsen and Kristensen 2005). Given the relatively high inherent soil fertility in the MD, one should aim for a (near) neutral nutrient balance which can be achieved through better use of on-farm resources and a reduction of external inputs.…”

Section: Discussionmentioning

confidence: 99%

Modeling the soil nutrient balance of integrated agriculture-aquaculture systems in the Mekong Delta, Vietnam

Phong

Stoorvogel

Mensvoort

et al. 2010

Nutr Cycl Agroecosyst

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This study quantifies soil nutrient balances of Integrated Agriculture-Aquaculture Systems in the Mekong Delta of Vietnam. Eleven farms were monitored to collect data on farm activities and nutrient inputs and outputs to compute these balances of the rice-based and high input fish system in O Mon district (R-HF); the rice-based and medium input fish system in Tam Binh district (R-MF); and the orchardbased and low input fish system in Cai Be district (O-LF). For the estimation, the Nutmon model has been adapted to the specific conditions in these integrated systems in Asia (Nutmon-Asia). New regression models of leaching and gaseous losses of nitrogen were applied to fields used for upland crops and paddy rice. Reference values were used for the assessment of nitrogen fixation in paddy soils, wet atmospheric deposition, and irrigation water. The results showed that farms in all three systems have nitrogen, phosphorus and potassium surpluses (84 kg N, 73 kg P, and 69 kg K ha -1 year -1 ). The O-LF system had the smallest nitrogen surplus while the smallest surplus of phosphorus and potassium was seen in the R-HF system. High surpluses of phosphorus and potassium were found in vegetable fields, whereas a negative potassium balance was found in the rice fields of all three systems. The positive farm nutrient balances indicate that it is likely that soil fertility will be maintained although there is a risk for environmental contamination.

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“…Since individual-animal and whole-farm estimates of NUE using a farm N budget are normalized to production outputs, they can be used to compare farms that are of different spatial or production scales and/or that have different management practices (Oenema 2006, Nielsen andKristensen 2005). Nitrogen budgets are used for scientific inquiry, as metrics for producers, and to inform policy decisions (Oenema et al 2003).…”

Section: Nitrogen Budgetsmentioning

confidence: 99%

Nitrogen Fluxes Into, Out Of, and Within a Virginia Permaculture Livestock Farm

Noll

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Nitrogen (N) is necessary for food production, but when N in excess of crop-plant requirements enters the environment, it creates a number of detrimental impacts.Alternative agricultural practices, such as pasture-based livestock production, are often suggested as possible strategies for minimizing negative environmental impacts of modern agriculture. To evaluate the potential for these practices to decrease N losses to However, relative to other fluxes, the magnitude of the N sink represented by the pond is small (1 -3% of surplus N on the farm).Timbercreek Farm N use efficiencies are similar to conventional farm efficiencies, but, in contrast to conventional farms, spread surplus N over a larger area.ii On-site biogeochemical processes store and/or transform surplus N and prevent it from being exported in the streams. Relative to conventional agriculture, alternative livestock practices, such as those at Timbercreek Farm, have the potential to reduce negative environmental impacts on the farm scale, but are not likely to address the larger issue of inefficient resource use.

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Nitrogen and phosphorus surpluses on Danish dairy and pig farms in relation to farm characteristics

Cited by 77 publications

References 11 publications

Modelling representative and coherent Danish farm types based on farm accountancy data for use in environmental assessments

Modelling representative and coherent Danish farm types based on farm accountancy data for use in environmental assessments

Modeling the soil nutrient balance of integrated agriculture-aquaculture systems in the Mekong Delta, Vietnam

Nitrogen Fluxes Into, Out Of, and Within a Virginia Permaculture Livestock Farm

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