In biology, the BBCH-scale for cotton describes the phenological development of cotton plants Gossypium hirsutum using the BBCH-scale.
The phenological growth stages and BBCH-identification keys of cotton are: 1 Leaves are counted from the cotyledon node (= node 0) 2 Side shoot development may occur earlier, if there is a vegetative side shoot continue with principal growth stage 2.
If there is a reproductive side shoot (fruiting branch) continue with the principal growth stage 5 3 Vegetative side shoots are counted from the cotyledon node 4 "pin-head square" or "match-head square" is the first square which forms at the first fruiting position of the first fruiting branch