Study On Acoustic Emission Characteristics And Classification Method Of Tomato

Water metabolism in plants directly affects the growth and development of tomato plants.During the transport of water,the water column in the conduit is broken and filled with gas,leading to catheter embolism,causing plant acoustic emission.Therefore,it is of great significance to study the variation law of acoustic emission signals of tomato plants and the classification and identification of acoustic emission signals of different soil moisture content.The tomato experiment was conducted to study the effect of different irrigation methods on the growth of tomato plants,the variation pattern of acoustic emission signals of tomatoes,and the classification and identification of acoustic emission signals.The test results are as follows:1.Different irrigation methods have different effects on the growth and development of tomato plants Compared with weigh irrigation,the growth characteristics and water use efficiency of tomato under negative head irrigation are significantly increased,water consumption is significantly reduced,yield and quality are also improved;comprehensive analysis,different treatment of tomato water consumption,photosynthetic characteristics,root activity As can be seen from the output,soil water content and irrigation volume with a negative head suction value of 60 hPa are more suitable for the growth of potted tomato plants in the greenhouse.2.The water consumption,photosynthetic characteristics and acoustic emission signals of tomato in different growth stages are different.With the growth of tomato plants,the water consumption,photosynthetic characteristics,acoustic resonance signal parameters and spectrum parameters of the different growth stages show an increase and then decrease.The trend of acoustic emission spectrum parameters shows a trend of decreasing first and then increasing.The amplitude of characteristic parameters of acoustic emission signals is significantly(P<0.01)positively correlated with greenhouse environmental temperature3.The photosynthetic characteristics and acoustic emission signals of different heights of tomato stems are different.With the change of the height of tomato stem,the change rule of the acoustic emission signal and the photosynthetic characteristics of tomato were opposite.The parameters of acoustic emission and the spectral parameters of the five-leaf stem were the highest,and the photosynthetic characteristics of the fifth leaf below the growth point were the strongest.4.With the weakening of water deficit,the characteristic parameters,the amplitude of resonance peak,the spectral parameters and the number and frequency range of energy bands in the time-frequency diagram of tomato acoustic emission signal are gradually increased,and the frequency of formant gradually decreases.The first increase and then decrease;with the decrease of the water deficit reduction time,the number of tomato acoustic emission events also gradually reduced;acoustic emission signal parameters can reflect the degree of water deficit,the number of acoustic emission events can be used as water deficit time One basis for judgment.According to the sample set of acoustic emission signal parameters within the growth period of tomato,a soil water content classification and identification model was constructed to comprehensively analyze the recognition rate and modeling time.The J48 decision tree algorithm is more suitable for soil moisture identification.The J48 decision tree algorithm was used to identify the soil water content of tomato during each growth period.The precision rate was higher than 70%.The J48 decision tree algorithm can well identify the soil moisture content of tomato.