In biology, the BBCH-scale for beans describes the phenological development of bean plants using the BBCH-scale.
The phenological growth stages and BBCH-identification keys of bean are: Growth stageCodeDescription0: Germination00 Dry seed01 Beginning of seed imbibition03 Seed imbibition complete05 Radicle emerged from seed07 Hypocotyl with cotyledons breaking through seed coat08 Hypocotyl reaches the soil surface; hypocotyl arch visible09 Emergence: hypocotyl with cotyledons break through soil surface ("cracking stage")1: Leaf development10 Cotyledons completely unfolded12 2 full leaves (first leaf pair unfolded)13 3rd true leaf (first trifoliate leaf) unfolded1 . Stages continuous till ...19 9 or more leaves (2 full leaves, 7 or more trifoliate) unfolded2: Formation of side shoots21 First side shoot visible22 2nd side shoot visible23 3rd side shoot visible2 . Stages continuous till ...29 9 or more side shoots visible5: Inflorescence emergence51 First flower buds visible55 First flower buds enlarged59 First petals visible, flowers still closed6: Flowering60 First flowers open (sporadically within the population)61 Beginning of flowering: 10% of flowers open1 Beginning of flowering262 20% of flowers open163 30% of flowers open164 40% of flowers open165 Full flowering: 50% of flowers open1 Main flowering period267 Flowering finishing: majority of petals fallen or dry169 End of flowering: first pods visible17: Development of fruit71 10% of pods have reached typical length1 Beginning of pot development272 20% of pods have reached typical length173 30% of pods have reached typical length174 40% of pods have reached typical length175 50% of pods have reached typical length, beans beginning to fill out1 Main pod development period276 60% of pods have reached typical length177 70% of pods have reached typical length, pods still break cleanly178 80% of pods have reached typical length179 Pods: individual beans easily visible18: Ripening of fruit and seed81 10% of pods ripe (beans hard)1 Seeds beginning to mature282 20% of pods ripe (beans hard)183 30% of pods ripe (beans hard)184 40% of pods ripe (beans hard)185 50% of pods ripe (beans hard)1 Main period of ripening286 60% of pods ripe (beans hard)187 70% of pods ripe (beans hard)188 80% of pods ripe (beans hard)189 Fully ripe: pods ripe (beans hard)19: Senescence97 Plants dead99 Harvested product
1 For varieties with limited flowering period 2 For varieties in which the flowering period is not limited
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