The technique has given good results on high
base status soils with moderate fertility. However, on
acid and low fertility soils, where both hedgerow
species and associated crops tend to have shallow
and restricted root growth, below ground nutrient
competition between woody and crop species can
become a major problem (Evensen et al., 1991; Szott
et al., 1991). Results of trials in the semi-arid zone
have not been encouraging (Singh et al., 1989) as
moisture competition between hedgerows and crops
is a major problem.