See:
http://horttech.ashspublications.org/cgi/reprint/17/2/169?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&author1=sealy&searchid=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT
Link: horttech.ashspublications.org/cgi/reprint/17/2/169?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&author1=sealy&searchid=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT