A Case Study on the Nutrient Regime in Sustainable Farming

Kaffka, Steve; Koepf, H.

doi:10.1080/01448765.1989.9754508

Cited by 36 publications

(20 citation statements)

References 9 publications

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“…The C:N ratios of SOM fractions have often been used as indices of quality; however, interpretation of trends can be difficult. Agricultural use of soils reduces total soil C:N ratios, which typically range from 14-8, as labile SOM is lost (Duxbury et al, 1989;Kaffka and Koepf, 1989). However, Miller et al (2004) reported that soil C:N ratio decreased during cultivation only with decreasing temperature.…”

Section: And N Relationshipsmentioning

confidence: 95%

Microbial biomass and N cycling under native prairie, conservation reserve and no-tillage in Palouse soils

Purakayastha

Smith²,

Huggins³

2009

Geoderma

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Section: And N Relationshipsmentioning

confidence: 95%

Microbial biomass and N cycling under native prairie, conservation reserve and no-tillage in Palouse soils

Purakayastha

Smith²,

Huggins³

2009

Geoderma

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“…Sales of N in kg/ha at Lea Hall were similar to those from a biodynamic farm in the Netherlands, selling milk, cereals and potatoes (Vereijken 1986); sales of N in kg/ha at Brynllys were much lower and similar to those at Talhof (Kaffka & Koepf 1989), where sales were predominantly in the form of milk and livestock. Sales of c. 24 kg N/ha at Brynllys appear low in relation to the N yields recorded in ley herbage and the high proportion of leys on the farm (which together suggest that > 175 kg N/ha was available for animal production each year, taking the farm as a whole).…”

Section: Discussionmentioning

confidence: 79%

“…Purchases/ha of N, P and K were also low on Talhof, a mixed farm with dairy cows in southern Germany, described by Kaffka & Koepf (1989). At Brynllys, more P and K were purchased than were sold, which suggests that the soils were not being depleted of these elements, unless losses into the subsoil and streams were large.…”

Section: Discussionmentioning

confidence: 89%

N, P and K on organic farms: herbage and cereal production, purchases and sales

1993

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S U M M A R YYields of dry matter, nitrogen, phosphorus and potassium in herbage and cereals from fields representing different stages of the rotation were recorded on two organic farms in 2 years. Amounts of N, P and K purchased and sold were also recorded on these farms. Some additional data was obtained from three other organic farms.Herbage production was very satisfactory, whether fields were grazed or cut. The proportion of clover in sown swards was, in most cases, satisfactory to high, but the clover content was very low in a few fields. The yields of cereals were about equal to or below the average obtained on farms using fertilizer and other agrochemical inputs. Manure was normally applied to the leys, which were the fertility-building part of the rotation, rather than to the cereal crops. Leaching of K from manure heaps was considerable.Purchases of N, P and K (mainly in manure) seemed excessive on one of the farms. On one of the farms studied in less detail, less P and K were purchased than were sold. More attention could be given to the balance between purchases and sales of N, P and K and to the efficient conversion of N into saleable produce.

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“…Nitrogen balance data from 21 published surveys located in Europe, from Northern Italy to Southern Norway (latitude from 458 to 608 N), were used (19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31). Surveys covered conventional, integrated, and organic farms; most of them were based on averages of several farms, often over several years, and others were intensive case studies of prototype farms (Tables 2 and 3).…”

Section: Methodsmentioning

confidence: 99%

High Nitrogen Costs of Dairy Production in Europe: Worsened by Intensification

Bleken¹,

Steinshamn²,

Hansen³

2005

AMBIO: A Journal of the Human Environment

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Intensification of agriculture has been proposed as one way of minimizing emissions per unit of product, apparently legitimizing the ongoing structural changes in agriculture. We have investigated the relationship between the farming intensity and the nitrogen (N) dissipation by calculating the overall N emission factor (E: total N surplus per unit of N in the produce) from several studies of dairy farms, covering a wide range of environments and production intensities. Fundamental steps were 1) the distinction between trophic levels, mineral, plant and animal N; and 2) the inclusion of N losses related to bought feed. The results show that E increases significantly with the production intensity of the dairy farm. The tradition for separate optimization of the animal and crop sectors may be a reason. We suggest that the N pollution can be mitigated by more extensive farming, both by re-coupling crop and animal production side by side, and by keeping land under cultivation when production is reduced.

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A Case Study on the Nutrient Regime in Sustainable Farming

Cited by 36 publications

References 9 publications

Microbial biomass and N cycling under native prairie, conservation reserve and no-tillage in Palouse soils

Microbial biomass and N cycling under native prairie, conservation reserve and no-tillage in Palouse soils

N, P and K on organic farms: herbage and cereal production, purchases and sales

High Nitrogen Costs of Dairy Production in Europe: Worsened by Intensification

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