BBCH скала

http://en.wikipedia.org/wiki/BBCH-scale

http://www.google.bg/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&ved=0CDcQFjAC&url=http%3A%2F%2Fwww.jki.bund.de%2Ffileadmin%2Fdam_uploads%2F_veroeff%2Fbbch%2FBBCH-Skala_englisch.pdf&ei=Sy5tUIa8E-mF4gTsgIH4Cw&usg=AFQjCNG_iG5rTXmS4XZO45oDx0spRZ19LA