Experimental Study On Sunshine Continuous Withering Method Of White Tea And Its Application Effect

Withering is the key process during white tea process. However, the current withering process exists many problems of long duration, labor-intense, inefficient and high energy-consuming. Therefore, study on the new withering process of White tea has great significance not only for improving tea quality and efficiency, but also for reducing labor cost. The article carrys on systematic reasearch to the facilities which used sunshine as energy source and continuous equipment which can conducted sunshine withering and natural withering automatically of White tea.The article set the contrast test between sunshine withering and natural withering, the result shows that using sunshine withering makes the remain dose of AA and TPS is more than using natural withering, but the remain dose of TP and Flavones is less. The result of sensory quality shows that the raw tea of sunshine withering getting 2.7 point than natural withering, AA and TPS are the important composition of fresh and mellow of White tea. so sunshine withering is good for the change of physiology and biochemical of White tea and it has significant superiority.The article analysis on the solar altitude and orientation from the perspective of sun elevation angle, north latitude of plant site and the extent of lighting. The result shows that the orientation should be North South and the roof angle should be 22°, and the rusult also shows that the temperature in the sunshine room is higher than outside at any time, it means the sunshine withering room which used PC board as covering material has good performance of isolation and heat storage, and it preliminary meet the temperature demand of withering. Through systematic determine to the temperature, relative humidity and the wind wind of same level and vertical plane, the result shows that the relative humidity and the wind speed exist difference.Through the experimental study on sunshine continuous withering method and its application effect,the result shows that :(1) The testing results the sunshine continuous withering method of different climate condition indicate:the aveage is 2.83℃higer than outside in the rainy day, and their difference reach level of significance. In sunny day at about noon, it needed to take proper measure of shading to decrease the temperature in the withering room, and avoid harmful influence on the tea quality which caused by overhigh temperature.The effect of humidity elimination is not significance in the conditon of natural ventilation, it neet to equip with a fan to improve the environment.(2) The testing results the change of moisture of different withering method:the dehydrating rate present the trend of"low-fast-low", The dehydrating rate ranking is manual combined withering by bamboo mat > sunshine continuous withering > manual combined withering by bamboo curtain in sunny day; and in rainy day, the ranking is sunshine continuous withering > manual combined withering by bamboo mat > manual combined withering by bamboo curtain.The testing results the ranking of different spreading thickness in the continuous withering equipment. In sunny day, A1(1.00kg/sieve)> CK > A2(1.25 kg/ sieve)> A3(1.50kg/sieve); In rainy day, CK > A1'(0.75 kg/ sieve) > A2'(1.00 kg/sieve)> A3'(1.25 kg/ sieve)。(3)The biochemical analysis result shows that: the remain dose of TP and Flavones is least of sunshine continuous withering,the remain dose of AA and TPS is between manual combined withering by bamboo curtain and manual combined withering by bamboo mat. The result of variance analysis shows that the difference of AA and Flavones reachs level of significance, and the remain dose of TP and TPS had not significant difference.The result of sensory quality shows that the quality of sunshine continuous withering reaches level of manual combined withering by bamboo curtain, the score ranking: CK>A2>A1>A3(April,9th); CK>A2'>A1'>A3' (April,12nd). Consider with energy utilization and result of sensory quality, in sunny day the spreading thickness choose A2(1.25Kg/sieve), and in rainy day choose A2' (1.00 Kg/sieve).(4) The testing results the economic analysis of sunshine withering room and continuous withering equipment indicate: the operation cost of sunshine withering method could save $ 54644.40yuan and the cost of raw tea could save $ 0.21yuan perkilo.Consider the energy saving, quality improving and labor saving, the method of sunshine withering method has wide application prospect.