Mexico: study on the financial crisis, the adjustment policies and agricultural development

Se pasa revista al desarrollo de la economia mexicana en general y del sector agropecuario en particular, desde la segunda guerra mundial hasta la crisis de 1982.

The world agricultural outlook in the 1990s

Includes bibliography

Price elasticity of Central American agricultural exports

Includes bibliography

Public policies and the competitiveness of agricultural exports

Includes bibliography

Non-agricultural rural employment in Central America

Includes bibliography

The role of agents in agricultural policies: intentions and reality

Includes bibliography

Non-sectoral agents and recent changes in Argentina's agricultural sector

Includes bibliography

The agricultural machinery industry in Argentina: from restructuring to internationalization?

Includes bibliography

Agricultural and trade policy reforms in Latin America: impacts on markets and welfare

Includes bibliography

The environmental dimension in agricultural development in Latin America

Includes bibliography

Energy and the prevailing model of agricultural technology in Latin America

Includes bibliography

Assessment of the genotoxicity of two agricultural residues after processing by diplopods using the Allium cepa assay

Agroindustrial by-products and residues from treatment of sewage sludge have been recently recycled as soil amendments. This study was aimed at assessing toxic potential of biosolid, obtained from a sewage treatment plant (STP), vinasse, a by-product of the sugar cane industry, and a combination of both residues using Allium cepa assay. Bioprocessing of these samples by a terrestrial invertebrate (diplopod Rhinocricus padbergi) was also examined. Bioassay assembly followed standards of the Brazilian legislation for disposal of these residues. After adding residues, 20 diplopods were placed in each terrarium, where they remained for 30 days. Chemical analysis and the A. cepa assay were conducted before and after bioprocessing by diplopods. At the end of the bioassay, there was a decrease in arsenic and mercury. For the remaining metals, accumulation and/or bioavailability varied in all samples but suggested bioprocessing by animals. The A. cepa test revealed genotoxic effects characterized by different chromosome aberrations. Micronuclei and chromosome breaks on meristematic cells and F1 cells with micronuclei were examined to assess mutagenicity of samples. After 30 days, the genotoxic effects were significantly reduced in the soil + biosolid and soil + biosolid + vinasse groups as well as the mutagenic effects in the soil + biosolid + vinasse group. Similar to vermicomposting, bioprocessing of residues by diplopods can be a feasible alternative and used prior to application in crops to improve degraded soils and/or city dumps. Based on our findings, further studies are needed to adequately dispose of these residues in the environment. © 2013 Springer Science+Business Media Dordrecht.