UNIVERSITY OF MISSOURI EXTENSION
 

Last Corn Irrigation

Step 1

Pull ear from corn.

Step 2

Break in half; take tip end.

Step 3

Find milk-line by eye-balling it or prodding with small jeweler's screwdriver.

Step 4

After determining location of milk-line, use table here to see when last irrigation should occur.

When Last Irrigation Should be Applied to Corn
 Without HardpanWith Hardpan Above 10 inches
Soil TypeSprinklerFloodSprinklerFlood
Coarse sand1/2 milk-line1/2 milk-line3/4 milk-line1/2 milk-line
Fine sand, Loamy sand, Clay, Clay loam1/2 milk-line1/4 milk-line1/2 milk-line1/2 milk-line
Sandy loam, Fine sandy loam, Very fine sandy loam1/2 milk-line1/4 milk-line1/2 milk-line1/2 milk-line
Silty clay, Silty clay loam, silt loam1/4 milk-linebeginning dent1/2 milk-line1/4 milk-line