Information Management to Maximize Your Yields

What does V(n) mean in your crop?

Corn

You often hear your agronomist talking about applying products on your crops at certain stages of growth or V stage. The V stage of the corn plant is determined by the number of collars formed on the plant. (See picture for example.) The leaf collar is the yellow flared band appearing at the point where the leaf is attached to the sheath. The drawing illustrates a corn plant in the third-leaf, or V-3 stage. Notice that while six leaves are visible, only the three lower mature leaves that have a definite leaf collar are counted when identifying the stage of development.

NOTE: Keep in mind that not all plants in a field will reach the same stage at the same time. A field of corn is defined to be at a specific stage when 50% or more of the plants in the field are in or beyond that stage.

 

Soybeans

This identification system divides plant development into vegetative (V) and reproductive (R) stages. With the exception of the first two stages, the (V) stages are designated numerically as V1, V2, V3, etc. through V(n) where (n) represents the number for the last node stage of a specific variety. The (n) will fluctuate with variety and environmental differences. The eight R stages are simply designated numerically.

Vegetative and Reproductive Stages

The V stages following VC are numbered according to the uppermost fully developed leaf node. Star with the unifoliolate leaf node when counting the number of fully developed leaf nodes. A leaf node is fully developed when the leaf above it has leaflets which are fully unrolled. That is, the leaflet edges are no longer touching.

 

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