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 ResourceJournal Articles & BooksDecember, 1999Brazil, Central America, South America
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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 ResourceJournal Articles & BooksDecember, 1999Colombia, South America, Central America
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Library ResourceReports & ResearchDecember, 1999Colombia, Central America, South America
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Library ResourceDecember, 1999Central America, South America
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Library ResourceJournal Articles & BooksDecember, 1999Brazil, Central America, South America
The effects of land-use change on the structure of Oxisols in the Brazilian savannas (also known as the Cerrados) are still insufficiently understood. We therefore studied loamy and clayey Oxisols under natural savanna, crop, pasture, and reforestation to (1) quantify management-induced changes in the quantity of water-stable aggregates, (2) identify the main aggregating agents, and (3) correlate aggregation with changes in pore-size distribution. Clayey soils showed a significantly higher macroaggregation than did loamy soils.
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