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Abstract

Modern agriculture is causing extensive environmental damage. Arguments have been put forward that a systemic change is needed in agriculture to address the major environmental challenges faced by mankind. This is a case study of a research farm whose aim is to form a farming system that has a minimal impact on carbon and nitrogen cycles while maintaining biodiversity. For the farm to minimise its impact on the global carbon cycle and associated climate change, it is important to reduce fossil energy use. The research farm has minimised all its inputs, but uses a diesel-run tractor. Agriculture's primary function is to provide food of adequate quality. The hypothesis of this study is that using biomass from arable land for tractor work on the farm would reduce the amount of food produced relative to using fossil fuel for tractor work. The objective of this paper was to develop scenarios for biomass-derived tractor work for the study farm chosen and to investigate their impact on food production. Food availability was measured by the number of people the farm could supply, denoted as Np. A farm nitrogen, phosphorus and potassium (NPK) balance was also applied to the different scenarios. The investigated scenarios for replacing fossil fuel tractor work were draught horsepower combined with cold-pressed rape-seed oil in a tractor, ethanol from wheat produced in a conventional ethanol plant, and farm-made ethanol from potatoes. Using wheat and potato to produce ethanol reduced food production by 23% and 18% respectively, compared to using conventional diesel. Combining a draught horse and on-farm cold-pressed rapeseed oil only reduced the food production by 6%. N is maintained in all scenarios due to the nitrogen-fixing leys. P can be maintained in the fields if bones are recycled, but nutrients, especially K, are moved from meadow to field.

Keywords

food production; small-scale farming; nutrient balance; draught horse power; organic farming; biofuel production

Published in

Acta Agriculturae Scandinavica, Section B - Soil and Plant Science
2014, volume: 64, number: 2, pages: 109-120
Publisher: TAYLOR & FRANCIS AS

SLU Authors

Global goals (SDG)

SDG2 Zero hunger
SDG7 Affordable and clean energy
SDG12 Responsible consumption and production

UKÄ Subject classification

Agricultural Science

Publication identifier

  • DOI: https://doi.org/10.1080/09064710.2013.867071

Permanent link to this page (URI)

https://res.slu.se/id/publ/64922