在农业生产中，有些科技人员往往对初、终霜日和初、终霜冻日及无霜期和无霜冻期的概念与标准混淆不清，相互代替使用。这是因为这些概念之间虽然有些区别，但其间的联系也是十分紧密的。所以只有深入地将它们加以区别，才能更好地指导当地的农业生产。什么是初、终霜？所谓初 In agricultural production, some scientific and technical personnel are often confused about the concepts and standards of primary and final frost days and initial and final frost days, frost-free periods and frost-free periods, and instead use them instead of each other. This is because although there are some differences between these concepts, but the connection between the very close. Therefore, only by differentiating them in depth can we better guide the local agricultural production. What is the beginning, the final frost? The so-called early