2006 Annual Report 4d.Progress report. This report serves to document research conducted under a specific cooperative agreement between ARS and the University of Florida Tropical Research and Education Center. Additional details can be found in the report for the parent project 1275-22000-203-00D: “Microbes, natural products, and amendments for management of plant-parasitic nematodes.” Florida vegetable growers are challenged by the loss of methyl bromide and a lack of alternative plant-parasitic nematode management options. In this second year of research, several tropical cover crops known to be suppressive or resistant to nematodes were evaluated in microplot and field studies, alone or in combination with an alkaline-stabilized biosolid product. Cover crop biomass production, cover crop host status, nematode reproduction on a subsequent tomato crop and changes in soil properties were monitored. The combination of leguminous cover crops and an alkaline-stabilized biosolid product did promote the production of ammonia in soil. There were differences in nematode suppression among the tropical cover crops tested. In related research, the morphological traits, phenology, and biomass production of nine velvetbean lines were evaluated in south Florida. This type of information will allow for the selection of an appropriate velvetbean line depending upon the demands of a vegetable production system.