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浙江大学学报（农业与生命科学版）
Journal of Zhejiang University (Agriculture and Life Sciences)  2018, Vol. 44 Issue (4): 507-514    DOI: 10.3785/j.issn.1008-9209.2018.07.180
    
Physical and mechanical properties of eastern gamagrass seed
HUANG Wencheng1,2, ZHANG Lin1, YE Dapeng1,3*, TAYLOR Alan George2*
(1. College of Mechanical and Electronic Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China; 2. School of
Integrative Plant Science, Cornell University/New York State Agricultural Experiment Station, Geneva, NY 14456-0462, USA; 3. Fujian Engineering Research Center of Modern Agricultural Equipment, Fuzhou 350002, China)
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Abstract  Conventional seed dehulling methods are unable to separate caryopses from intact cupules of eastern gamagrass as the cupules are thick and rigid, and the seeds are irregular-shaped. To put forward a feasible method of mechanical dehulling, we investigated and analysed the physical and mechanical characteristics of intact seeds, cupules and caryopses, and then evaluated the characterics that can be applied in mechanical dehulling. The testing results indicated that the tertraploid cultivar Meadowcrest had a larger seed size and a heavier seed mass than diploid Pete. The mean caryopsis mass was approximately 1/3 and 1/4 of the intact seed mass for Pete and Meadowcrest,  respectively. The intact cupule was approximately twice as long as the caryopsis for all three seed lots measured. The moisture content of the cupules was significantly lower than that of the caryopses. The rupture force of the intact cupules was 1/2-2/3 of the caryopses for Pete and Meadowcrest when pressed longitudinally, respectively. Seed size, moisture content and rupture force codetermined that longitudinal seed pressing might be an effective method to remove the cupules without harming the caryopses. 

Key words： eastern gamagrass seed      capule      caryopsis      physical and mechanical properties      rupture force     
Published: 13 September 2018
CLC:  S 543.9  
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HUANG Wencheng
ZHANG Lin
YE Dapeng
TAYLOR Alan George
Cite this article:

HUANG Wencheng, ZHANG Lin, YE Dapeng, TAYLOR Alan George. Physical and mechanical properties of eastern gamagrass seed. Journal of Zhejiang University (Agriculture and Life Sciences), 2018, 44(4): 507-514.

URL:

http://www.zjujournals.com/agr/10.3785/j.issn.1008-9209.2018.07.180     OR     http://www.zjujournals.com/agr/Y2018/V44/I4/507


鸭茅状摩擦禾种子的物理力学特性

为解决鸭茅状摩擦禾种子因形态结构复杂、种壳坚硬厚实而导致的脱壳困难问题，本研究通过测定和分析完整种子、种壳和颖果的物理力学特性，探讨可行的机械化脱壳方法。结果表明：四倍体品种Meadowcrest 种子尺寸和质量均大于二倍体品种Pete，Meadowcrest 和Pete 这2 个品种的颖果质量各占完整种子质量的1/4 和1/3，其完整种子长度均约为颖果长度的2 倍；种壳含水率显著低于颖果含水率；种子破裂力大小与压缩方向有关，轴向压缩时完整种子的破裂力为颖果破裂力的1/2～2/3。种子尺寸、水分和破裂力特性共同决定了轴向压缩可能是一种有效分离鸭茅状摩擦禾种子的种壳并获得无损伤颖果的方法。

关键词： 鸭茅状摩擦禾种子,  种壳,  颖果,  物理力学特性,  破裂力 
[1] Liang Xifeng, Cai Yangyang, Wang Yongwei. Experiment on physical and mechanical properties of tomato seedling pot for automatic vegetable transplanter[J]. Journal of Zhejiang University (Agriculture and Life Sciences), 2015, 41(5): 616-622.