Estudo da mineralizacao do nitrogenio da matéria organica do solo sob sistemas agroflorestais de Cordia e Erythrina em Turrialba, Costa Rica
The mineralization of N in soil organic material was studied from November 1989 to June 1990. The following systems were involved: coffee (Coffea arabica) with poró, (Erythrina poeppigiana) coffee with laurel, cacao with poró, cacao with laurel (Cordia alliodora). The experiment has split-plots (coffee or cacao) within random complete blocks (two repetitions) of the shade tree species. After 30 days all of the ammonium found in soil samples had been transformed into nitrate. There was a negative correlation between soil moisture and mineralization rates, but the efect of vegetation (i.e. system) was much stronger. Soil samples from poró systems had the greatest mineralization rates even though their soil moisture was greater than in the soil under laurel systems. Available N for plants (remaining in the soil) was also greater under poró systems.
| Main Authors: | , , , , , |
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| Format: | biblioteca |
| Language: | eng |
| Published: |
1992
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| Subjects: | COFFEA ARABICA, THEOBROMA CACAO, CORDIA ALLIODORA, ERYTHRINA POEPPIGIANA, AGROFORESTERIA, MINERALIZACION, NITROGENO, SUELO, PLANTAS DE SOMBRA, MATERIAL ORGANICO DE COBERTURA, MATERIA ORGANICA, COSTA RICA, |
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