BBCH-scale (bulb vegetable)

In biology, the BBCH-scale for bulb vegetables describes the phenological development of bulb vegetable plants, such as onion, leek, garlic and shallot, using the BBCH-scale.

The phenological growth stages and BBCH-identification keys of bulb vegetables are:

Growth stageCode (2-digit)Code (3-digit)Description
0: Germination 00000Dry seed,1 dormant bulb2
01000Beginning of seed imbibition1
03003Seed imbibition complete1
05005Radicle emerged from seed.1

Roots appearing2

07007Cotyledon breaking through seed coat1
09009Emergence: cotyledon breaks through soil surface.1

Green shoot visible2

010Cotyledon visible as hook1
011Hook stage: hooked cotyledon green1
012Whip stage: cotyledon has whip-like form1
1: Leaf development (Main shoot) 10100Advanced whip stage: whip begins to die off1
11101First leaf (> 3 cm) clearly visible
121022nd leaf (> 3 cm) clearly visible
131033rd leaf (> 3 cm)
1 .10 .Stages continuous till . . .
191099 or more leaves clearly visible
4: Development of harvestable vegetative plant parts 41401Leaf bases begin to thicken or extend
4340330% of the expected bulb or shaft diameter reached
4540550% of the expected bulb or shaft diameter reached
47407Bolting begins; in 10% of the plants leaves bent over3

70% of the expected shaft length and diameter reached4

48408Leaves bent over in 50% of plants3
49409Leaves dead, bulb top dry; dormancy3

Growth complete; length and stem diameter typical for variety reached4

5: Inflorescence emergence 51501Onion bulb begins to elongate
5350330% of the expected length of flower stem reached
55505Flower stem at full length; sheath closed
57507Sheath burst open
59509First flower petals visible; flowers still closed
6: Flowering 60600First flowers open (sporadically)
61601Beginning of flowering: 10% of flowers open
6260220% of flowers open
6360330% of flowers open
6460440% of flowers open
65605Full flowering: 50% of flowers open
67607Flowering finishing: 70% of petals fallen or dry
69609End of flowering
7: Development of fruit 71701First capsules formed
7270220% of capsules formed
7370330% of capsules formed
7470440% of capsules formed
7570550% of capsules formed
7670660% of capsules formed
7770770% of capsules formed
7870880% of capsules formed
79709Capsule development complete; seeds pale
8: Ripening of fruit and seed 81801Beginning of ripening: 10% of capsules ripe
85805First capsules bursting
89809Fully ripe: seeds black and hard
9: Senescence 92902Leaves and shoots beginning to discolour
9590550% of leaves yellow or dead
97907Plants or above ground parts dead
99909Harvested product (seeds)

1 Seed sown
2 Onion sets, shallot and garlic
3 For onions, garlic
4 For leek

References

  • Feller, C.; H. Bleiholder; L. Buhr; H. Hack; M. Hess; R. Klose; U. Meier; R. Stauss; T. van den Boom; E. Weber (1995). "Phänologische Entwicklungsstadien von Gemüsepflanzen: I. Zwiebel-, Wurzel-, Knollen- und Blattgemüse. Nachrichtenbl. Deut". Pflanzenschutzd. 47: 193–206.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.