Experimental study on morphological and mechanical properties of tea tree shoot tips
This study was conducted to investigate the morphological distribution of tea tree shoots and the deformation pattern of harvesting area,and the statistical and mechanical characteristics of shoot morphological parameters were tested.Firstly,six types of tea tree varieties,including Longjing 43,Zhongcha 108 and Baiye 1,were used as test objects to analyze the morphological characteristics of shoot tip distribution and harvesting requirements of tea trees during the harvesting period.Secondly,the physical parameters of the shoot tips,including the distance from the growth base of each leaf to the tip of the shoot,the diameter and width of the stem and the water content of the shoot tips,etc.,were analyzed.Finally,experiments on the shear and bending mechanical properties of the shoot tips of tea trees were conducted.The results showed that the leaf tip distance and the equivalent diameter of each stem seg-ment were normally distributed.The distribution of leaf apical spacing at the first,second and third leaf positions of the six tea tree samples ranged from 16 to 22 mm,25 to 35 mm and 40 to 60 mm,in that order.The equivalent di-ameters of the first,second and third stem segments of short tips were concentrated in the ranges of 1.2-1.4,1.4-1.6,1.6-2.0 mm,respectively,and the water content gradually decreased and remained roughly between 78％and 86％.With the change of leaf position from top to bottom,the bending stiffness and shear stress of the stem gradually increased,and there were differences among different tea tree species,but the change trend was simi-lar;there was a sudden pressure change interval during the bending test of tea tip stem under pressure,and the me-chanical characteristics of the stem picked from the young tip during the downward pressure were quantitatively ana-lyzed with Longjing 43 as the research object.The study provides a theoretical basis for further understanding of the physical characteristics of tea tree shoot tips and optimizing the design of tea picking devices.
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