Why evaluate Particle Size?

• Correct chop length minimizes air (oxygen) in the pile or bunker.

• Correct chop length is important for fiber in the ration.

• Recommended corn Theoretical Length of Chop (TLC) is 1/2"  to 3/4". Grass and alfalfa TLC is 3/8" to 1/2". 

When should Particle Size be evaluated? 

• Before harvest, set up a station at weigh scale or safe area.

• During harvest, once per hour, sample chopped silage before it is piled/stored.

• Run the Dry Matter Test and Kernel Processing Score Test at the same time for efficiency and maximum valuable data.

What equipment is needed? Penn State Method

• Penn State Particle Separator (Shaker Box)

• Gram scale

• Container for weighing sample

• PRINTABLE Particle Size Test Log and Written Instructions

• Binder to file results of all tests

What equipment is needed? Cup method

• 32 ounce cup

• Printable KERNEL PROCESSING AND CHOP LENGTH SCORE LOG

Who can run the test?

• Anyone who can keep samples organized and do simple math on a calculator

• Recruit and train two to three people to make sure tests are run over entire harvest

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