Matthew Poole and continuators on Leviticus 11:38

38 But if any water be put upon the seed , and any part of their carcass fall thereof, it shall be unclean unto you.

The reason of the difference is, partly because wet seed doth sooner receive and longer retain any pollution; and partly because such seed was not fit to be sown presently, and therefore that necessity which justified the use of the dry seed which was speedily to be sown could not be pretended in this case.