棉花的硬实种子和其它豆类的硬实种子一样,系指浸在水中不易吸水膨胀发芽的种子。由于硬实种子的种皮坚硬不透水,阻碍种子的发芽,如果硬实种子所占比重较大,它会影响种子的发芽率。 The hard seeds of cotton, like the hard seeds of other beans, refer to seeds that are soaked in water that they do not swell easily and germinate. Due to the hard and impermeable seed coat of the hard seeds, which hinders the germination of the seeds, if the proportion of the hard seeds is larger, it will affect the germination rate of the seeds.