This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
稡 combines 禾 (grain) with 卒, which likely contributes a phonetic element. The exact historical development is uncertain.
The left side is grain 禾, and the right side is 卒, which can suggest a soldier or finish. Without a clear meaning, picture grain gathered by a soldier after a battle.
For ソツ, imagine a soldier (卒) gathering grain (禾) in a sudden rush: the soldier's quick movement sounds like 'sotsu' (ソツ).