ESTUDO DA MINERALlZAÇÃO DO NITROGÊNIO DA MATÉRIA ORGÂNICA DO SOLO SOB SISTEMAS AGROFLORESTAIS DE CORDIA E ERYTHRINA EM TURRIALBA, COSTA RICA
DOI:
https://doi.org/10.24278/2178-5031.199242840Keywords:
Agroforestry, systems, nutrient liberation, mineralization of organic material, Coffea arabica, Theobroma cacao, Erythrina poeppigiana, Cordia alliodoraAbstract
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, (Erytrhina 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 ali 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 effect of vegetation (i.e. system) was much stronger. Soil samples from poró systems had the gratest mineralization rates even though their soi! moisture was greater than in the soil under laurel systems. Available N for plants (remaining in the soil) was also greater under poró systems.
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References
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