一、纯度鉴定:种子纯度是指纯净种子占全部种子的百分率。纯净种子指能够发芽的种子,包括完好的种子,带有轻伤和发育不够健全,但有发芽希望的种子。杂质包括土、石、枝叶以外,还有那些发育不完全,明显枯萎、破碎或外伤较重、没有发芽希望的种子。检查前,先分离出夹杂物称得纯净种子的重量,与原种量比,即得纯度。二、种皮颜色检查:每一树种的种皮都有一定的正常颜色。如华北落叶松的种皮为黄褐色等。但种皮的颜色也不是固定不变 First, the purity identification: seed purity refers to the percentage of pure seeds of all seeds. Pure seeds are seeds that can germinate, including intact seeds, seeds with slight injuries and underdevelopment, but with germinating hope. Impurities include soil, stone, foliage, as well as those that are underdeveloped, severely withering, crushing, or traumatized, with no hope of germination. Before inspection, first separated inclusions called the weight of pure seeds, and the original species than the amount of purity. Second, the color of the seed coat examination: Each species of seed coat has a certain normal color. Such as the seed coat of Larix principis-rupprechtii and so on. But the color of the seed coat is not fixed either