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Showing items 1 through 9 of 86.-
Library ResourceJournal Articles & BooksDecember, 1999Mexico, Central America
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Library ResourceJournal Articles & BooksDecember, 1999Brazil, Central America, South America
In the Brazilian savannas, or Cerrados the rapid advance in agriculture and cattle ranching is affecting soils through, for example, accelerated erosion and depletion of soil organic matter (SOM). Changes in soil microbial biomass are good indicators of changes in SOM. We therefore assessed the effects of agricultural and pastoral use of a clayey Oxisol in the Cerrados on soil microbial biomass, and evaluated the usefulness of this parameter in studying SOM dynamics in savanna ecosystems.
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Library ResourceJournal Articles & BooksDecember, 1999Ecuador
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Library ResourceJournal Articles & BooksDecember, 1999Brazil, Central America, South America
The effect of land use on the availability of soil nitrogen (N) was studied by separating total soil N into one labile and one stable fraction by oxidation and extraction of labile N with potassium permanganate. The nitrogen management index (NMI) was calculated according to Blair et al. (1995) for the carbon management index. In all systems, labile N released by potassium permanganate was a better indicator for nitrogen availability than were total and stable N. The NMI was a good indicator for N availability but gave no information on the total amount of N.
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Library ResourceReports & ResearchDecember, 1999Honduras, Central America, South America
The study establishes the link between agricultural labor productivity and natural resources variables at the national level in Honduras. We show through spatial analysis of productivity and natural resources that the relationship between natural resource conditions and agricultural productivity is not as direct as one can imagine. Length of the rain)" season has a strong and quasi linear relation with income. Soil has little impact on productivity as well as slope and altitude since coffee production in the mountain has a strong relation on productivity.
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Library ResourceJournal Articles & BooksDecember, 1999Peru, Central America, South America
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Library ResourceJournal Articles & BooksDecember, 1999Brazil, Central America, South America
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Library ResourceJournal Articles & BooksDecember, 1999Central America, South America
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Library ResourceJournal Articles & BooksDecember, 1999Central America, South America
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Library ResourceManuals & GuidelinesDecember, 1999Colombia
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