Method for detecting plant electric signal in green house and special equipment thereof

The invention discloses a method and a special device to detect electric signal of greenhouse plant. Its steps are: (1) Takes unpolarized electrode as reference and measuring electrode. (2) Connects electrode and plant stems or leaves without consuming by electrode linkage unit. (3) Adopts impedance transformer with its input impedance greater than 1012Omega to connect with output port of electrode separately. Signal output port of each impedance transformer is connected with a preamplifier, whose output signal is transferred to current signal by a voltage-current converter sending to signal processing unit for processing. The invention can long-term detect change of plant electric signal without consuming, process weak plant electric signal to separate signal and noise. When environment factor changes, it can calculate and detect main factor causing changes of plant electric signal by some arithmetic, which provides premise condition for plant electric signal detecting transferring from lab research to servi