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SALUS gPhase Documentation

Lydia, Brian, & Bernardo
August 9, 2018

 

Definitions of gPhase

  1. Until emergence
  2. Until induction (WH,BA incl. vern. Others incl. juv.)
  3. Until end of veg. growth (last leaf stops expanding)
  4. Until ear stops growing
  5. 4Until maturity
  6. 5Matured 

 

Relation of gPhase to Corn Stages

  • gPhase 1: begins when corn emerges (VE)
  • gPhase 2: begins ? and ends when the leaves stop growing (V10?)
  • gPhase 3: begins when the leaves stop growing (V10?) and ends when vegetative growth stops, tassel is the last vegetative stage (VT)
  • gPhase 4: grain fill period, begins at R1 and ends at physiological maturity (R6). Beginning of phase 4 should correspond to “silking” (“anthesis”)
  • gPhase 5: begins at physiological maturity (R6)

 

Corn Stage Information

Vegetative Stages

VE

Emergence

V1

First Leaf

V2

Second Leaf

V6

Sixth Leaf

V10

Tenth Leaf

V(n)

nth Leaf

VT

Tassle

Reproductive Stages

R1

Silking

R2

Blister

R3

Milk

R4

Dough

R5

Dent

R6

Black Layer (Physiological Maturity)

 

Timing information:

  • The tassel is visible about 2-3 days prior to silk emergence
  • Blister stage (R2) occurs about 10-12 days after silking (R1)
  • Kernel Milk stage (R3) occurs about 18-20 days after silking (R1)
  • Kernel Dough stage (R4) occurs about 24-26 days after silking (R1)
  • Kernel Dent stage (R5) occurs about 31-33 days after silking (R1)
  • Physiological Maturity (R6) occurs about 55-65 days after silking (R1)

Sources:

http://www.agronomy.k-state.edu/extension/crop-production/corn/corn-growth-and-development.html

https://www.agry.purdue.edu/ext/corn/news/timeless/grainfill.html

Daily time series of gPhase and GWAD. GWAD begins increasing at the start of gPhase
Figure 1. Daily time series of gPhase and GWAD. GWAD begins increasing at the start of gPhase
Daily time series of gPhase and KRPP. KRPP begins increasing at the end of gPhase 3
Figure 2. Daily time series of gPhase and KRPP. KRPP begins increasing at the end of gPhase 3
Daily time series of gPhase and LAI. LAI stops increasing at the start of gPhase 3.
Figure 3. Daily time series of gPhase and LAI. LAI stops increasing at the start of gPhase 3.