| Vegetative Stages |
| VE |
Emergence |
Cotyledons above soil surface |
| VC |
Unrolled |
Unifoliolate leaves unrolled; leaf edges do not touch |
| V1 |
First trifoliolate |
Fully developed leaves at unifoliolate nodes
|
| V2 |
Second trifoliolate |
Fully developed trifoliolate leaf at node above unifoliolate |
| V3 |
Third trifoliolate |
Three nodes on main stem with fully developed leaves beginning with the unifoliolate |
| V(n) |
nth trifoliolate |
n=number of nodes on main stem with fully developed leaves begining with the unifoliolate |
| Reproductive Stages |
| R1 |
Beginning bloom |
Open flower at any node on main stem |
| R2 |
Full bloom |
Open flowers at one of the two uppermost nodes on main stem |
| R3 |
Beginning pod |
Pod 3/16 inch long at one of the four uppermost nodes on main stem |
| R4 |
Full pod |
Pod 3/4 inch long at one of the four uppermost nodes on main stem |
| R5 |
Beginning seed |
Seed 1/8 inch long at one of the four uppermost nodes on main stem |
| R6 |
Full seed |
Pod containing a green seed that fills pod cavity on one of the four uppermost nodes |
| R7 |
Beginning maturity |
One normal pod on main stem has reached mature pod color |
| R8 |
Full maturity |
95 percent of pods have reached mature pod color; approximately 5 to 10 days before harvest |
Source: Iowa State University