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在小麦良种繁育过程中要严格防止混杂，保证品种纯度，以防退化。除了过去生产上常见和有关资料介绍的机械混杂、生物学混杂、人工误选退化、基因突变外，近几年我们在小麦良种繁育过程中又发现了另一种混杂来源，即上茬遗籽混杂。近几年来，山东省淄博市张店区小麦实行联合收
Wheat breeding in the breeding process to strictly prevent mixing, to ensure the purity of varieties, to prevent degradation. In addition to the common mechanical and biological hybrids, artificial misclassification degeneration, and genetic mutations introduced in the past in production, in recent years we found another mixed source in the breeding of wheat, that is, Mixed. In recent years, Zhangdian District, Zibo City, Shandong Province, the implementation of the joint collection of wheat