منابع مشابه
Agriculture, pesticides and the ecosystem
General equilibrium analysis provided economists with a good understanding of intraeconomy interdependence and a mature and powerful methodology of modeling it. When it became evident that economic activities had detrimental effects on ecological systems (ecosystems, for short), environmental economics developed as a branch of externality theory which, however, focuses on environment-economy in...
متن کاملOrganic agriculture cannot replace conventional agriculture
In this paper, we consider the effect of increasing the area of agricultural land under organic practises. We assumed that organic agriculture does not have effective means of pathogen control. We model pathogen dispersal with a diffusive logistic equation in which the growth/death rate is spatially heterogeneous. We find that if the ratio of the organic plots to conventional plots is below a c...
متن کاملOrganic agriculture: opportunities and challenges
The tradition in agriculture has been to maximize production and minimize the cost of food with little regard to impacts on the environment and the services it provides to society. As the world enters an era in which global food production is likely to double, it is critical that agricultural practices be modified to minimize environmental impacts even though many such practices are likely to i...
متن کاملTrichoderma in Organic Agriculture
Biocontrol, or Biological Control, can be defined as the use of natural organisms, or genetically modified, genes or gene products, to reduce the effects of undesirable organisms to favour organisms useful to human, such as crops, trees, animals and beneficial microorganisms. This strategy of control is ecologicaly clean and compatible with different models of agriculture: organic, biological a...
متن کاملOrganic Urban Agriculture
Urban agriculture (UA) has a long tradition in many countries worldwide, is actively engaging about 800 million people, and is now increasingly considered by urban planning and land-use personnel. Urban cropland, in particular, covers more than 67 Mha or more than 5% of the total global cropland area. Urban agriculture practices have many benefits and, in particular, may contribute to food secu...
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ژورنال
عنوان ژورنال: Environmental Health Perspectives
سال: 2004
ISSN: 0091-6765,1552-9924
DOI: 10.1289/ehp.112-a865b