Vegetative Stages
| Stage no. |
Abbreviated stage title |
Description |
| VE |
Emergence |
Cotyledons above the soil surface |
| V1 |
First node |
Fully developed leaves at unifoliolate nodes |
| V2 |
Second node |
Fully developed trifoliolate leeav at node above the unifoliolate nodes nodes |
| V3 |
Third node |
Three nodes on the main stem with fully develped leaves begining with the unifoliolate nodes |
| Vn |
nth node |
n number of nodes on the main stem with fully developed leaves begining with the unifoliolate nodes. |
|
Reproductive Stages
| Stage no. |
Abbreviated stage title |
Description |
| R1 |
Begining bloom |
One open flower at any node on the main stem |
| R2 |
Full bloom |
Open flower at one of the two uppermost nodes on the main stem with a fully develped leaf |
| R3 |
Begining pod |
Pod 5 mm (3/16 inch) long at one of the four uppermost nodes on the main stem with a fully developed leaf |
| R4 |
Full pod |
Pod 2 cm (3/4 inch) long at one of the four uppermost nodes on the main stem with a fully developed leaf |
| R5 |
Begining seed |
Seed 3mm (1/8 inch) long in a pod at one of the four uppermost nodes on the main stem with a fully developed leaf |
| R6 |
Full seed |
Pod containing green seed that fills the pod cavity at one of the four uppermost nodes on the main stem with a fully developed leaf |
| R7 |
Begining maturity |
One normal pod on the main stem that has reached its mature pod color |
| R8 |
Full maturity |
Ninety-five percent of the pods that have reached their mature pod color |
|
Stages Illustration
References Fehr, W.R., Caviness, C.F., Burmood, D.T., Pennington, J.S., 1971. Stage of development descriptions for soybeans, Glycine max (L.) Merrill. Crop Sci. 11, 929-931.
Fehr, W.R., Caviness, C.E., 1977. Stages of soybean development. Cooperative Extension Service, Agriculture and Home Economics Experiment Station, Iowa State University, Ames, Iowa.
