怎样选用蔬菜种子。简单的一句话就是必须选用安全有效使用期内的种子，才有确保苗全苗壮，以至丰产。现介绍常见几种蔬菜种子的新旧识别及其安全有效期。 　　一、白菜籽 安全有效使用期 2年，成熟饱满的新种子表皮富有光泽不易破裂，呈铁锈色或红褐色，胚芽处略凹，子叶为米 How to choose vegetable seeds A simple sentence is the need to use safe and effective use of seeds within the period, have to ensure that all Miao Miao Zhuang, and even high yield. Now introduce the common identification of several old and new vegetable seeds and their safety period. First, the safe and effective use of cabbage seed period of 2 years, full of mature new seed epidermis shiny and not easy to rupture, was rusty or reddish brown, slightly concave embryo, cotyledon rice