In order to improve the germination rate via mechanical seedcoat nicking method instead of manual operation. The germination hindrance of triploid watermelon seed was analyzed by seedcoat infrastructure features compared with diploid watermelon seed. Familiar watermelon seeds of three varieties, Heiniu, Mihong and Huapi, at the moisture content of 11.1, 11.2 and 10.6% (w.b.), were selected to study the mechanical nicking properties using common methods, respectively. Test results showed that the loading speed of pressure had an influence on the seedcoat nicking force. The maximum compression values of all seeds were as the designing standard for the compressing rocker. The loading speed of pressure was chosen as 80-100 mm/min; the maximum nicking force as 68.97 N. It is concluded that the results provide basic parameters and theoretical basis to design a seedcoat nicking machine for triploid watermelon seeds.%为实现机械破壳代替人工破壳的方式提高无子西瓜种子的发芽率.对比二倍体西瓜种子,用种壳超微结构分析方法解释了三倍体西瓜种子的发芽障碍原因;并采用3种常见的三倍体西瓜种子黑牛、蜜红和花皮,含水率分别为11.1％、11.2％和10.6％,运用常用试验方法对实现机械破壳的力学特性进行了试验研究.试验结果得出三倍体西瓜种子的加载速度对破壳力的影响；设计压缩摇杆时,其调节量标准以各品种的压缩变形量最大值为基准；加载速度宜选择80～100 mm/min;最大破壳力为68.97 N.研究得到的结果为开发三倍体西瓜种子破壳机械提供了基本参数和理论计算依据.
展开▼
