See the margin and references. The fruit of newly-planted trees was set apart from common uses for four years.
Related Commentaries of Deuteronomy 20:6
Deuteronomy 20:6
6 And what man is he that hath planted a vineyard, and hath not yet eatenb of it? let him also go and return unto his house, lest he die in the battle, and another man eat of it.