Reasearch And Design Of Promotion Growth Of Plant Audio Frequency

The crop production has been improved greatly by the chemical agriculture in the 20th, but the excessive chemical fertilizer, which caused soil to break down, crop quality to descend and environment to be polluted, has affected agricultural continuous development greatly. Currently, agriculture is situated in transitional period from traditional agriculture to modern agriculture, moreover, the physical agriculture is one of ways of realizing modern agriculture, and the plant acoustic controlling technique is an importance part of the physical agriculture, which can promote the growth of the plant to breed, increase and perfect the quality and resist diseases. It doesn't pollute the environment at all. Besides, usage of this technique can decrease fertilizer and chemical drug used for farming, the technique can be used to produce green vegetables and satisfy the demand of social continuous development and has great social benefits.The promotion growth device of plant audio frequency was designed with plant acoustic controlling technique principle in the paper in order to explore the relation of plant acoustic characteristic and its growth and make certain special frequency band of influence on growth plant, the device could play high power audio signal. The device was composed of microcontroller system, power amplifier and speaker system. The microcontroller system regarded newly-developed SPCE061A microcontroller of Taiwanese sunplus company as core, the wave was produced by two DAC channels, sunplus provides great convience for us in this way, throught using it, may deduce peripheral circuit, furthmore, it also provides good program condition for us. Audio function model was constructed in the software design, on this base; Sunplus math function was used to perform wave output. The 45W TA8225L power amplifier produced by TOSHIBA was adopted, which has high power, low distortion and low noise, it includes various kind of protectors and the function of standy-by SW. besides, the functions of output short or over voltage detection and junction temperature monitor was involved. The T-1301 speaker produced by tempest electronics CO., LTD in Tianjin was adopted, which has wide frequency band, high sensitivity and low resonant frequency. The parameters of power amplifier and speaker were measured and calculated and the close box was designed through speaker parameters. The close box could meet the demand of design.The experiment was carried out in horticulture station of northeast agriculture university. The device was utilized to deal with spinach. Two group fields researched A and compared Bwas adopted. Nine appearance indexes of spinach were measured, compared and analyzed; the result indicated the signal produced by device could promote growth of plant.