saarums

From saar(t) (“to plow, to till”) +‎ -ums (with saart from sa- +‎ art (“to plow”)).

saarums m (1st declension)

1. ridge, crest formed by two strips of earth being brought together by two opposed goings of a plow on a field

   lauka ražību mazina izarumi un saarumi; saarumos augu rīcībā ir lielāks daudzums auglīgas augsnes, izarumos - tikai plāna tās kārtiņa ― depressions (furrows) and ridges reduce the productivity of a field; in the ridges, during the growing of the crops, there is a larger amount of fertile soil, in the depressions - only a thin layer of it

2. (rare) the (finished) action of tilling, plowing (a field); the result of this action

   “labs saarums” saka par labi sastrādātu lauku ― one says “good tilling/tillage” about a well tilled, cultivated field.