The growth of shoots and roots (Castanea sativa
Mill) in tissue culture stimulated with a weak pulsed electromagnetic field
(EMF) (250 microT peak intensity), frequency 2, 12 and 24 Hz and different
times of stimulation as well as stimulated with samarium-cobalt round magnets
with B=1060 mT and H=760 kA/m 24 h/day was investigated. The experiments
lasted 28 days for the growth of shoots and 21 days for the growth of roots.
Stimulation with pulsed EMF 1h/day had the most stimulative effects. Namely
a field of 24 Hz stimulated growth and 2 Hz the number of axillary buds.
Stimulation for 2h/day had no effects, 24 h/day was slightly inhibitory.
In the field of 2 Hz, rooting was most effectively stimulated in October
(for 24 h/day every other day). The static magnetic field had no pronounced
effects on the growth of shoots; the south pole stimulated the growth more
than the north pole.