In biology, the BBCH-scale for peanut describes the

phenological Phenology is the study of periodic events in biological life cycles and how these are influenced by seasonal and interannual variations in climate, as well as habitat factors (such as elevation). Examples include the date of emergence of leaves ...

development of

peanut The peanut (''Arachis hypogaea''), also known as the groundnut, goober (US), pindar (US) or monkey nut (UK), is a legume crop grown mainly for its edible seeds. It is widely grown in the tropics and subtropics, important to both small and ...

s using the

BBCH-scale The BBCH-scale is used to identify the phenological development stages of plants. BBCH-scales have been developed for a range of crop species where similar growth stages of each plant are given the same code. Phenological development stages of plan ...

. The phenological growth stages and BBCH-identification keys of peanuts are: 1 Leaves are counted from the cotyledon node (= node 0)
2 Side shoot development may occur earlier; in this case continue with principal growth stage 2
4 Only for varieties with a determinate flowering period
5 Criteria of maturity: Pericarp hard, with distinct texture, can be split open easily;

References

* {{cite journal , last = Munger , first = L. , author2=H. Bleiholder , author3=H. Hack , author4=M. Hess , author5=R. Stauss , author6=T. van den Boom , author7=E. Weber , title = Phenological Growth Stages of the Peanut plant (Arachis hypogaea L.) Codification and Description according to the BBCH Scale – with figures. , journal = Journal of Agronomy and Crop Science , volume = 180 , pages = 101–107 , date = 1998 , doi = 10.1111/j.1439-037X.1998.tb00377.x , issue = 2 BBCH-scale Peanuts