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| Watson, C.A.; Bengtsson, H.; Ebbesvik, M.; Loes, A-K.; Myrbeck, A.; Salomon, E.; Schroder, J.; Stockdale, E.A.. |
| On organic farms, where the importation of materials to build/maintain soil fertility is restricted, it is important that a balance between inputs and outputs of nutrients is achieved to ensure both short-term productivity and long-term sustainability. This paper considers different approaches to nutrient budgeting on organic farms and evaluates the sources of bias in the measurements and/or estimates of the nutrient inputs and outputs. The paper collates 88 nutrient budgets compiled at the farm scale in 9 temperate countries. All the nitrogen (N) budgets showed an N surplus (average 83.2 kg N ha-1 year-1). The efficiency of N use, defined as outputs/inputs, was highest (0.9) and lowest (0.2) in arable and beef systems respectively. The phosphorus (P) and... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Soil quality. |
| Ano: 2002 |
URL: http://orgprints.org/8061/2/Watson_orgrpints_8061.pdf |
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| Strøm, T.; Ebbesvik, M.. |
| Long term studies of organic milk production on a Norwegian organic farm (Tingvoll farm) show that it is possible to achieve high milk yields with moderate concentrate inputs in organic milk production with Norwegian Red Cattle. The milk yields at Tingvoll farm were generally higher, and the concentrate input lower than the average of all Norwegian dairy farms. Average annual milk yields, as well as annual concentrate consumption per cow increased during the study period both for organic and conventional dairy production in Norway. The results from Tingvoll farm may inspire conventional dairy farmers to convert, since the differences to organic production are not necessarily too large. Alternatively, they may be inspired to reduce their concentrate inputs. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Dairy cattle; Feeding and growth. |
| Ano: 2013 |
URL: http://orgprints.org/24585/1/24585.pdf |
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