Table 1: Phenological growth stages of Ziziphus jujuba (BBCH scale).

BBCH scale

Growth stages

Growth stage 0:  Bud growth

00

Leaf bud in winter dormancy

01

Bud started to swell

03

Bud swelling completed

07

Bud sprouting begin

09

Bud shows green tips

Growth stage 1: Leaf formation and growth

10

Leaf (10 mm) emerge from leaf buds

11

Opening of first leaf

15

Unfolding of several leaves

19

Full growth of first leaves

Growth stage 3: Shoot growth

31

Beginning of shoot growth

32

20% of shoot growth

33

30% of shoot growth

39

90% of shoot growth

Growth stage 5: Formation of inflorescence

51

Enlargement of the inflorescence buds

53

Buds opened (greenish buds observed)

54

Green scales covered inflorescence

55

Appearance of flower buds (not fully open), opening of green scales

56

Flowers started to separate, sepals not fully expanded

57

Opening of sepals, white petal tips appeared (closed)

59

Opening of flower petals

Growth stage 6: Flowering

60

Opening of first flower

61

Opening of almost 10% flowers

62

Opening of almost 20% flowers

63

Opening of almost 30% flowers

64

Opening of almost 40% flowers

65

Complete flowering (opening of 50% flowers), first petals drop down

67

Withering and dropping of flowers and petals

69

Flowering ended: Almost all petals dropped

Growth stage 7: Fruit formation, growth and development

71

Rapid growth in fruit ovary; first fruit dropping

72

Tiny fruits surrounded by dying sepals, sepals started to drop

73

Heavy fruit dropping

75

Fruit attained 50% of its final dimension

76

Fruit attained 60% of its final dimension

77

Fruit attained 70% of its final dimension

78

Fruit attained 80% of its final dimension

79

Fruit attained 90% of its final dimension

Growth stage 8: Fruit and seed maturation

81

Change in fruit color: From dark green to light reddish brown                             

85

Fruit color advanced; becomes dark reddish brown

87

Picking stage for distant transportation

89

Fruit has excellent eating quality, final harvesting stage

Growth stage 9: Senescence, beginning of dormancy

91

End of shoot growth but leaves are green

92

Change in leaf color, green color started to disappear

93

Leaf dropping started

95

Discoloring and dropping of about 50% leaves

97

Dropping of all leaves

99

Dormancy