http://vocab.lternet.edu/vocab/vocab/http://vocab.lternet.edu/vocab/vocab/skos/901bud burst http://vocab.lternet.edu/vocab/vocab/skos/901 biological events BT http://vocab.lternet.edu/vocab/vocab/skos/901 plant phenology RT http://vocab.lternet.edu/vocab/vocab/skos/901 budburst UF