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Frost Protection Effects and Control of Wind Machine for Tea Garden under Temperature Inversion during Early Spring

DAI Qingling1,ZHANG Shengbo1,LI Pingping2,HU Yongguang2(1.College of Machinery and Materials,Jiujiang College,Jiujiang Jiangxi 332005,China;2.College of Agricultural Engineering,Jiangsu University,Zhenjiang Jiangsu 212013,China)  
Late frost damage in early spring sometimes happens with temperature inversion.Tea production has severely suffered from radiation frost damage in early spring because of inversion temperature.Conventional methods of frost protection,such as covering,smoking or irrigation are ineffective;the method of disturbing air in the thermal inversion layer has proved applicable for frost protection in Europe,Japan and the USA,which is implemented by wind machines.However,research and development of the method in China is just at the beginning stage.The experiment was conducted to make clear the protection effect with wind machine under temperature inversion,the results show that the operation of wind machine could remarkably increase the temperature at tea plant canopy,especially when thermal inversion was strong.Within 25 m in front of the wind machine,tea canopy could be completely prevented from frost.And at 20 m in front of the wind machine the increased temperature reached the maximum of 3.6 ℃.Through the experiment and analysis on the protect affection with wind machine,A automatic control system of wind machine for frost protection was designed,The control system was designed which was relied on PC machine as the master control unit,and the MSP430 single chip was the hard-core of the various terminal unit,RS-485BUS was adapted to realize communication.Each terminal unit was a independent control part,it was developed to start or close the wind machine automatically according to the temperature inversion condition and the temperature of the tea canopy measured by the terminal unit,consequently reached the effect of centralized control and dispersed supervision.
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