To investigate the effects of combined exposure to extremely low frequency magnetic fields (ELF AC fields) and local geomagnetic field (DC field) on germination of hornwort seeds (Cryptotaenia japonica).
Three directions of the applied ELF magnetic AC field were considered (i.e. the vertical, the parallel, and the perpendicular) in relation to the geomagnetic DC field.
Exposure  Parameters 

Exposure 1:
3.5–14 Hz
Exposure duration:
repeated daily exposure, 24 h/day for 16 days


Exposure 2:
7 Hz
Exposure duration:
repeated daily exposure, 24 h/day for 16 days


Exposure 3:
7 Hz
Exposure duration:
repeated daily exposure, 24 h/day for 16 days


Frequency  3.5–14 Hz 

Type  
Waveform  
Exposure duration  repeated daily exposure, 24 h/day for 16 days 
Exposure source  

Setup  petri dish placed in the center of a pair of Helmholtz coils 
Measurand  Value  Type  Method  Mass  Remarks 

magnetic flux density  50 µT    measured    Geomagmetic field 
magnetic flux density  750 µT  effective value  measured    vertical field 
magnetic flux density  500 µT  effective value  measured    vertical field 
Frequency  7 Hz 

Type  
Waveform  
Exposure duration  repeated daily exposure, 24 h/day for 16 days 
Exposure source 


Measurand  Value  Type  Method  Mass  Remarks 

magnetic flux density  50 µT    measured    Geomagmetic field 
magnetic flux density  750 µT  effective value  measured    AC field orthogonal to the geomagnetic field 
magnetic flux density  500 µT  effective value  measured    AC field orthogonal to the geomagnetic field 
Frequency  7 Hz 

Type  
Waveform  
Exposure duration  repeated daily exposure, 24 h/day for 16 days 
Exposure source 


Measurand  Value  Type  Method  Mass  Remarks 

magnetic flux density  50 µT    measured    Geomagmetic field 
magnetic flux density  500 µT  effective value  measured    AC field parallel to the geomagnetic field 
magnetic flux density  750 µT  effective value  measured    AC field parallel to the geomagnetic field 
The geomagnetic field in addition with a vertical AC field at 750 µT at 7 Hz or 500 µT at 14 Hz effectively promoted the germination of the seeds. The parallel AC field was more effective than the perpendicular field.
This website uses cookies to provide you the best browsing experience. By continuing to use this website you accept our use of cookies.