The BBCH-scale (rice) identifies the phenological development stages of rice Oryza sativa. It is a plant species specific version of the BBCH-scale.
Growth stageCodeDescription0: Germination00 Dry seed (caryopsis)01 Beginning of seed imbibition03 Seed imbibition complete (pigeon breast)05 Radicle emerged from caryopsis06 Radicle elongated, root hairs and/or side roots visible07 Coleoptile emerged from caryopsis (in water-rice this stage occurs before stage 05)09 Imperfect leaf emerges (still rolled) at the tip of the coleoptile1: Leaf development1, 210 Imperfect leaf unrolled, tip of first true leaf visible11 First leaf unfolded12 2 leaves unfolded13 3 leaves unfolded1 . Stages continuous till ...19 9 or more leaves unfolded2: Tillering321 Beginning of tillering: first tiller detectable22 2 tillers detectable23 3 tillers detectable2 . Stages continuous till ...29 Maximum number of tillers detectable3: Stem elongation330 Panicle initiation or green ring stage: chlorophyll accumulates in the stem tissue, forming a green ring32 Panicle formation: panicle 1–2 mm in length34 Internode elongation or jointing stage: internodes begin to elongate, panicle more than 2 mm long (variety-dependent)37 Flag leaf just visible, still rolled, panicle moving upwards39 Flag leaf stage: flag leaf unfolded, collar regions (auricle and ligule) of flag leaf and penultimate leaf aligned (pre-boot stage)4: Booting41 Early boot stage: upper part of stem slightly thickened, sheath of flag leaf about 5 cm out of penultimate leaf sheath43 Mid boot stage: sheath of flag leaf 5–10 cm out of the penultimate leaf sheath45 Late boot stage: flag leaf sheath swollen, sheath of flag leaf more than 10 cm out of penultimate leaf sheath47 Flag leaf sheath opening49 Flag leaf sheath open5: Inflorescence emergence, heading451 Beginning of panicle emergence: tip of inflorescence emerged from sheath52 20% of panicle emerged53 30% of panicle emerged54 40% of panicle emerged55 Middle of panicle emergence: neck node still in sheath56 60% of panicle emerged57 70% of panicle emerged58 80% of panicle emerged59 End of panicle emergence: neck node level with the flag leaf auricle, anthers not yet visible6: Flowering, anthesis61 Beginning of flowering: anthers visible at top of panicle65 Full flowering: anthers visible on most spikelets69 End of flowering: all spikelets have completed flowering but some dehydrated anthers may remain7: Development of fruit71 Watery ripe: first grains have reached half their final size73 Early milk75 Medium milk: grain content milky77 Late milk8: Ripening83 Early dough85 Soft dough: grain content soft but dry, fingernail impression not held, grains and glumes still green87 Hard dough: grain content solid, fingernail impression held89 Fully ripe: grain hard, difficult to divide with thumbnail9: Senescence92 Over-ripe: grain very hard, cannot be dented by thumbnail97 Plant dead and collapsing99 Harvested product
1 A leaf is unfolded when its ligule is visible or the tip of the next leaf is visible 2 Tillering or stem elongation may occur earlier than stage 13; in this case continue with stages 21 or 30 3 If stem elongation begins before the end of tillering continue with stage 30 4 Flowering usually starts before stage 55; continue with principal stage 6
References
External links A downloadable version of the BBCH Scales