Experimental study on morphological and mechanical properties of tea tree shoot tips

doi:10.3969/j.issn.1004-1524.20230692

Acta Agriculturae Zhejiangensis ›› 2024, Vol. 36 ›› Issue (6): 1425-1435.DOI: 10.3969/j.issn.1004-1524.20230692

• Biosystems Engineering • Previous Articles Next Articles

Experimental study on morphological and mechanical properties of tea tree shoot tips

FU Tong¹(), ZHENG Hang²^,³, XUE Xianglei²^,³, YE Yunxiang²^,³, YU Guohong²^,³^,^*(), GE Qing¹

1. School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China
2. Institute of Agricultural Equipment, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
3. Key Laboratory of Agricultural Equipment for Hilly and Mountainous Areas in Southeastern China(Co-Construction by Ministry and Province), Ministry of Agriculture and Rural Affairs, Hangzhou 310021, China

Received:2023-05-29 Online:2024-06-25 Published:2024-07-02

Abstract

Abstract:

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 segment 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 diameters 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 similar; there was a sudden pressure change interval during the bending test of tea tip stem under pressure, and the mechanical characteristics of the stem picked from the young tip during the downward pressure were quantitatively analyzed 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.

Key words: tea, shoot tip, physical parameter, mechanical property

CLC Number:

S225.92

FU Tong, ZHENG Hang, XUE Xianglei, YE Yunxiang, YU Guohong, GE Qing. Experimental study on morphological and mechanical properties of tea tree shoot tips[J]. Acta Agriculturae Zhejiangensis, 2024, 36(6): 1425-1435.

Figures/Tables 18

References 21

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品种 Variety	各叶位平均叶顶距 Average distance between leaf tips at each leaf position			各茎秆段等效直径 Equivalent diameter of each stem segment
品种 Variety	1	2	3	1	2	3
白叶1号 Baiye 1	17.7	25.0	34.6	1.25	1.45	1.64
龙井43 Longjing 43	18.6	26.7	42.5	1.33	1.59	1.87
中茶108 Zhongcha108	17.6	23.9	35.4	1.20	1.47	1.73
银霜 Yinshuang	19.1	29.1	50.4	1.26	1.59	1.97
中茗6号 Zhongming 6	17.7	26.7	48.1	1.12	1.41	1.78
中茗7号 Zhongming 7	18.6	28.9	57.0	1.27	1.62	1.90

品种 Variety	各叶位平均叶顶距 Average distance between leaf tips at each leaf position			各茎秆段等效直径 Equivalent diameter of each stem segment
品种 Variety	1	2	3	1	2	3
白叶1号 Baiye 1	17.7	25.0	34.6	1.25	1.45	1.64
龙井43 Longjing 43	18.6	26.7	42.5	1.33	1.59	1.87
中茶108 Zhongcha108	17.6	23.9	35.4	1.20	1.47	1.73
银霜 Yinshuang	19.1	29.1	50.4	1.26	1.59	1.97
中茗6号 Zhongming 6	17.7	26.7	48.1	1.12	1.41	1.78
中茗7号 Zhongming 7	18.6	28.9	57.0	1.27	1.62	1.90

品种 Variety	一叶位段含水率 Moisture content of the one-leaf segment	二叶位段含水率 Moisture content of the two-leaf segment	三叶位段含水率 Moisture content of the three-leaf segment
白叶1号 Baiye 1	83.33	78.05	76.92
龙井43 Longjing 43	84.31	81.67	78.05
中茶108 Zhongcha 108	85.71	78.26	74.19
银霜 Yinshuang	84.6	79.14	77.7
中茗6号 Zhongming 6	86.05	82.5	79.17
中茗7号 Zhongming 7	85.7	80.05	78.3

品种 Variety	一叶位段含水率 Moisture content of the one-leaf segment	二叶位段含水率 Moisture content of the two-leaf segment	三叶位段含水率 Moisture content of the three-leaf segment
白叶1号 Baiye 1	83.33	78.05	76.92
龙井43 Longjing 43	84.31	81.67	78.05
中茶108 Zhongcha 108	85.71	78.26	74.19
银霜 Yinshuang	84.6	79.14	77.7
中茗6号 Zhongming 6	86.05	82.5	79.17
中茗7号 Zhongming 7	85.7	80.05	78.3

品种 Variety	茎秆段 Stem segment	截面长径 Longitudinal diameter of the cross- section/mm	截面短径 Transverse diameter of the cross- section/mm	截面惯性矩 Moment of inertia of the cross- section/mm⁴	弯曲模量 Flexural modulus/ MPa	抗弯刚度 Bending stiffness/ (MPa·mm⁴)
白叶1号	1	1.27	1.23	0.12	2.07	0.25
Baiye 1	2	1.48	1.45	0.22	3.61	0.79
	3	1.65	1.63	0.35	6.66	2.33
龙井43	1	1.35	1.32	0.15	2.19	0.33
Longjing 43	2	1.61	1.57	0.31	3.75	1.16
	3	1.89	1.86	0.60	5.96	3.58
银霜	1	1.31	1.22	0.12	1.14	0.14
Yinshuang	2	1.53	1.64	0.29	2.74	0.79
	3	2.04	1.92	0.71	5.16	3.66
中茶108	1	1.15	1.03	0.06	2.07	0.12
Zhongcha 108	2	1.38	1.23	0.13	4.89	0.64
	3	1.42	1.35	0.17	9.33	1.59
中茗6号	1	1.20	1.07	0.07	1.85	0.13
Zhongming 6	2	1.46	1.35	0.18	3.33	0.60
	3	1.85	1.71	0.45	5.19	2.34
中茗7号	1	1.32	1.24	0.12	1.53	0.18
Zhongming 7	2	1.68	1.56	0.31	2.26	0.70
	3	1.99	1.82	0.59	4.49	2.65

Experimental study on morphological and mechanical properties of tea tree shoot tips

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品种 Variety	茎秆段 Stem segment	平均切断载荷 Average cutting load/N	最大切断载荷 Maximum cutting load/N	最小切断载荷 Minimum cutting load/N	平均剪切强度 Average shear strength/MPa
白叶1号	1	4.15	5.08	3.39	2.53
Baiye 1	2	7.16	8.69	5.49	4.06
	3	13.54	17.90	10.23	6.44
龙井43	1	4.39	5.54	3.58	3.16
Longjing 43	2	7.42	9.08	5.42	3.73
	3	14.21	18.02	11.85	5.15
银霜	1	3.71	4.40	3.00	2.97
Yinshuang	2	6.71	8.84	5.73	3.41
	3	14.12	15.91	9.26	4.58
中茶108	1	4.20	6.42	2.97	3.72
Zhongcha 108	2	7.19	9.12	5.4	4.20
	3	11.22	14.06	8.51	4.74
中茗6号	1	3.55	4.78	2.2	3.53
Zhongming 6	2	5.42	8.20	3.97	3.52
	3	10.31	18.18	7.02	4.15
中茗7号	1	4.23	5.70	2.57	3.31
Zhongming 7	2	7.44	9.99	5.05	3.62
	3	14.05	18.74	11.12	4.94

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