A soil profile, which was applied in a right angle to
hedgerows of R. pseudoacacia to a depth of 1m, provided a
visual assessment of the horizontal growth of roots from R.
pseudoacacia. Roots of R. pseudoacacia were still present in the
alleys within a distance of 2.5mfromthe hedgerowbut did not
occur beyond a distance of 4m. These findings supported the
findings made above (see Section 3.3) with regard to the influence
of hedgerows on yields of M. sativa within a distance of
2.5 m. Based on this information sampling points for the estimation
of the root distribution were defined as follows: “Black
locust” samples were taken in the middle of R. pseudoacacia
(black locust) plots. Only roots of black locust occur. “Alfalfa
(2.5 m)” samples were taken from the alleys 2.5mfar from the
hedgerow. Below-ground both roots of alfalfa and black locust
occur. “Alfalfa (10.5 m)” samples were taken from the middle
of the alley. Only roots of M. sativa (alfalfa) occur.