What is Jointing?
Jointing is the point in the wheat's life cycle when the growing point moves above the soil surface. At this point, the stem is beginning elongation and the tiny wheat head in the main stem and each tiller is moving up the stem.
Why is it important?
This is a very busy time for a wheat plant. As the head begins to move up the stem, the maximum possible of kernels per head is determined at this time. The plant allocates nutrients to the main stem and tillers with at least three leaves. Once the plant has jointed, typically no more potential head-bearing tillers will form.
However, if the growing point has been killed during stem elongation, as a result of damage (physical, freeze, pests) to the immature head and supporting system, the main stem or tiller will die. As a result, the wheat plant will tend to compensate for the loss by development of new shoots from the base of the plant.
Wheat Growth and Development - Feeks Stages
Feeks 1.0 - Emergence, one shoot formed.
Feeks 2.0 - Beginning of tillering
Feeks 3.0 - Tillers formed
Feeks 4.0 - Beginning of erect growth, leaf sheaths lengthen
Feeks 5.0 - Leaf sheaths strongly erect
Feeks 6.0 - First node is visible
Feeks 7.0 - Second node visible, next to last leaf visible
Feeks 8.0 - Flag leaf visible
Feeks 9.0 - Ligule (collar) of flag leaf visible
Feeks 10.0 - Boot stage
Feeks 10.1 - awns visible, heads emerging though slit of flag leaf sheath
Feeks 10.2 - heading 1/4 complete
Feeks 10.3 - heading 1/2 complete
Feeks 10.4 - heading 3/4 complete
Feeks 10.5 - heading complete (harvest restriction for many fungicides)
Feeks 10.5.1 - beginning flower (bloom occurs 4 to 5 days after heading)
Feeks 10.5.2 - flowering complete to top of spike
Feeks 10.5.3 - flowering complere to bast of spike
Feeks 10.5.4 - kernels watery ripe
Feeks 11.0 - Ripening
Feeks 11.1 - milky ripe
Feeks 11.2 - mealy ripe
Feeks 11.3 - kernel hard
Feeks 11.4 - harvest ready