The cutting mechanism must be sharp and properly adjusted to cut the forage cleanly and to minimize shattering. Cut after the dew is gone and when the topsoil is dry to reduce soil compaction and to hasten hay drying. A long stubble keeps the windrow off the soil surface to aid drying and will improve subsequent pickup performance. Conditioning - Conditioning speeds drying, especially of the stem, by opening the waxy layer surrounding the stem. This can be done either mechanically or chemically.
Mechanical conditioners pass hay between two rolls to crush or crimp the stem.
Avoid flail type conditioners because excessive shatter losses will occur. Correctly adjusted conditioners maintain adequate roll pressure uniformly along the entire roll length. Apply sufficient roll pressure to the hay to cause a noticeable breaking of the stem skin, but not so much pressure that leaves are broken off. Keep the rolls clean and free of wrapped material. Check to insure that the roll has not worn more in the center than near the ends.