| Rice is the most important food crop in China,and the growth environment in its growth link is not invariable,and each link is related to the final harvest quality of rice.Therefore,in order to provide more feedback on the growth situation of rice,this paper based on the previous research,combined with time domain,frequency domain,time-frequency domain and other related methods to process the collected plant electrical signal data,the response characteristics of electric signal on rice leaves under the condition of univariate environmental factors and external excitation signal were studied.This research mainly includes the following contents:(1)A multi-channel plant electrical signal acquisition system for rice leaves was built.Biological electrical signals related literatures,according to the characteristics of the plant electrical signal structures,the multi-channel plant electrical signal acquisition system,the hardware part includes collecting electrode,with the core of multi-channel small signal amplifier AD620 conditioning module,high-speed data acquisition card,and various environmental factors monitoring sensor,the software part of the upper machine based on the Lab VIEW software development.The experimental results show that the system can collect plant electrical signals under different light intensity,different soil moisture content and different excitation intensity,and realize the goal of collecting plant electrical signals synchronously,at high speed,without loss and continuously under multiple channels.(2)The results revealed the response characteristics of plant electrical signals in rice leaves under different light intensities.Through 3 groups of comparative experiments,it was found that too low light intensity would increase the fluctuation of the plant’s own electrical signals.The analysis of 10 groups of data showed that the time domain characteristics were the most obvious when the light intensity was 8.77%(5.7k～5.8klx),and the signals were all positive potentials at this time,and the signal fluctuation was the largest.The power spectrum curve is mainly below4 Hz,and the darker part of the wavelet time-frequency diagram is concentrated in 1Hz～3Hz,but the overall change is not obvious.(3)The results revealed the response characteristics of rice leaves to plant electrical signals under different soil moisture.Through contrast experiment observed during rice under drought stress potential fluctuation is small,whereas random signal enhancement,higher activity,using 7sets of data analysis in this study the rice in the soil moisture content 78.9% of the time domain characteristics,the strongest signal power spectrum in spectrum is close to 4 hz-50 db,high energy part mostly in 2 hz,According to the wavelet time-frequency diagram,the strongest part of plant electrical signal energy is still concentrated in 1Hz～3Hz,and the color is the deepest when the soil water content is 78.9%.(4)The results revealed the response characteristics of plant electrical signals under different intensity of excitation signals on rice leaves.Through controlled trials found that square wave can let the plant electrical signal fluctuation occurs,then use the 15 sets of data analysis concluded that incentive is 4 V in the time domain signal characteristics,is significantly influenced by the power spectrum curve is mainly in 4 hz,but the signal energy in motivating volatility,when 1.5 V to 3 V signal after frequency range is widened,signal energy as a whole has significantly enhanced.Although the wavelet time-frequency diagram shows a richer signal frequency distribution,the darker color components still concentrate in 1Hz～3Hz. |
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