In biology, the BBCH-scale for peas describes the phenological development of peas using the BBCH-scale.
The phenological growth stages and BBCH-identification keys of peas are:
Growth stageCodeDescription0: Germination00 Dry seed01 Beginning of seed imbibition03 Seed imbibition complete05 Radicle emerged from seed07 Shoot breaking through seed coat08 Shoot growing towards soil surface; hypocotyl arch visible09 Emergence: shoot breaks through soil surface (“cracking stage”)1: Leaf development10 Pair of scale leaves visible11 First true leaf (with stipules) unfolded or first tendril developed12 2 leaves (with stipules) unfolded or 2 tendrils developed13 3 leaves (with stipules) unfolded or 3 tendrils developed1 . Stages continuous till ...19 9 or more leaves (with stipules) unfolded or 9 or more tendrils developed3: Stem elongation (Main shoot)30 Beginning of stem elongation31 1 visibly extended internode132 2 visibly extended internodes133 3 visibly extended internodes13 . Stages continuous till ...39 9 or more visibly extended internodes15: Inflorescence emergence51 First flower buds visible outside leaves55 First separated flower buds visible outside leaves but still closed59 First petals visible, flowers still closed6: Flowering60 First flowers open (sporadically within the population)61 Beginning of flowering: 10% of flowers open62 20% of flowers open63 30% of flowers open64 40% of flowers open65 Full flowering: 50% of flowers open67 Flowering declining69 End of flowering7: Development of fruit71 10% of pods have reached typical length; juice exudes if pressed72 20% of pods have reached typical length; juice exudes if pressed73 30% of pods have reached typical length; juice exudes if pressed.Tenderometer value: 80 TE74 40% of pods have reached typical length; juice exudes if pressed.Tenderometer value: 95 TE75 50% of pods have reached typical length; juice exudes if pressed.Tenderometer value: 105 TE76 60% of pods have reached typical length; juice exudes if pressed.Tenderometer value: 115 TE77 70% of pods have reached typical length. Tenderometer value: 130 TE79 Pods have reached typical size (green ripe); peas fully formed8: Ripening of fruit and seed81 10% of pods ripe, seeds final colour, dry and hard82 20% of pods ripe, seeds final colour, dry and hard83 30% of pods ripe, seeds final colour, dry and hard84 40% of pods ripe, seeds final colour, dry and hard85 50% of pods ripe, seeds final colour, dry and hard86 60% of pods ripe, seeds final colour, dry and hard87 70% of pods ripe, seeds final colour, dry and hard88 80% of pods ripe, seeds final colour, dry and hard89 Fully ripe: all pods dry and brown. Seeds dry and hard (dry ripe)9: Senescence97 Plants dead and dry99 Harvested product
1 The first internode extends from the scale leaf node to the first true leaf node
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