Abstract
Steam sterilization of a Typic Dystrandept in Costa Rica resulted in a six-fold increase in extractable Mn, to levels often considered toxic. Seeds of eight species, comprised of six successional taxa and two cultivars (soybean,Glycine max and raddish,Raphanus sativus) were planted in the sterilized soil and in unsterilized soil after delays of 1, 8, 15, and 28 days. Germination and mortality were not different in the two soils, indicating that steamsterilized soil can safely be used in seed traps. Six species (including both cultivars) grew better in unsterilized soil, but two of the native taxa (Phytolacca rivinoides andBocconia frutescens) grew significantly faster in sterilized soil.
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