leading-out wedge, the field of crop rotation, which is
temporarily been located out of the alternation of cultures.
They separate for the cultivation on it during the number of the
years of perennial, usually stern plants. After the end of the
period of use this field again is included in the rotation of crop
rotation, and instead of it another field is derived from the general
alternation and so forth the need for isolation v. p. and the
expediency of sowing on it those or others agr. of cultures depend on
concrete soil -klima-tic. and by the economic conditions of
economy.
