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Small Grains Development using Zadoks, Feekes, & Haun

ZadoksFeekesHaunDescription
                                                                                                              Germination
00 Dry Seed
01 Start of Imbibition
03 Imbibition Complete
05 Radicle emerged from seed
07 Leaf just at coleoptile tip
09 0.0
                                                                                                               Seedling Growth
10 1 First leaf through coleoptile
11 1.+ First leaf unfolded
12 1.+ 2 leaves unfolded
13 2.+ 3 leaves unfolded
14 3.+ 4 leaves unfolded
15 4.+ 5 leaves unfolded
16 5.+ 6 leaves unfolded
17 6.+ 7 leaves unfolded
18 7.+ 8 leaves unfolded
19 9 or more leaves unfolded
                                                                                                              Tillering
20 Main shoot only
21 2 Main shoot and tiller
22 Main shoot and 2 tillers
23 Main shoot and 3 tillers
24 Main shoot and 4 tillers
25 Main shoot and 5 tillers
26 3 Main shoot and 6 tillers
27 Main shoot and 7 tillers
28 Main shoot and 8 tillers
29 Main shoot and 9 or more tillers
                                                                                                                Stem Elongation
30 4-5 Pseudo stem elongation
31 6 1st node detectable
32 7 2nd node detectable
33 3rd node detectable
34 4th node detectable
35 5th node detectable
36 6th node detectable
37 8 Flag leaf just visible
39 9 Flag leaf ligule/collar just visible
                                                                                                                  Booting
40 --
41 8-9 Flag leaf sheath extending
45 10 9.2 Boots just swollen
47 Flag leaf sheath opening
49 10.1 First awns visible
                                                                                                                 Inflorescence Emergence
50 10.1 10.2 First spikelet of inflorescence visible
53 10.2 1/4 of inflorescence emerged
55 10.3 10.5 1/2 of inflorescence emerged
57 10.4 10.7 3/4 of inflorescence emerged
59 10.5 11.0 Emergence of inflorescence completed
                                                                                                                 Anthesis
60 10.51 11.4 Beginning of anthesis/flowering
65 11.5 Anthesis half-way
69 11.6 Anthesis complete
                                                                                                                Milk Development
70 --
71 10.54 12.1 Kernel watery ripe
73 13.0 Early milk
75 11.1 Medium milk
77 Late milk
                                                                                                               Dough Development
80 --
83 14.0 Early dough
85 11.2 Soft dough
87 15.0 Hard dough
                                                                                                               Ripening
90 --
91 11.3 Kernel hard (difficult to divide by thumbnail)
92 11.4 16.0 Kernel hard (can no longer be dented by thumbnail)
93 Kernel loosening in daytime
94 Over ripe, straw dead & collapsing
95 Seed dormant
96 Viable seed giving 50% germination
97 Seed not dormant
98 Secondary dormancy induced
99 Second dormancy lost
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