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小麦品种在生产上应用一个时期之后,往往出现混杂和退化。混杂指机械混杂、生物学混杂及突变混杂。退化多指品种在大面积上产量下降及抗病变感病等现象。针对品种的混杂退化,良种繁育上普遍采取提复纯壮措施,并且在具体作法上有穗选、穗行提纯复壮及穗行、穗系提纯复壮,即有一圃制、二圃制及三圃制之分。人们对这些作法认识不一,理解不同,急需进行研究。云南大学和云南农科院对水稻品种退化及复壮问题的探讨一文(原载《云南农业科技》1979年第2期),报导了4年的研究与调查结果,认
After a period of application of wheat varieties in production, they often appear mixed and degenerated. Hybrid refers to mechanical hybrid, biological hybrid and mutation mixed. Degraded more refers to the large-scale decline in yield and disease-resistant disease and other phenomena. For the mixed degeneration of varieties, breeding on breeding generally taken measures to improve the recovery of pure and strong, and in the specific practices of the ear election, the ear line purification and rejuvenation of the ear and ear lines, purification and rejuvenation, that is a nursery, two nursery and three nursery System of points. People have different understanding of these practices, different understandings, and urgently need to carry out research. Yunnan University and Yunnan Academy of Agricultural Sciences on the issue of rice varieties degeneration and rejuvenation (originally contained in “Yunnan Agricultural Science and Technology” 1979 the second period), reported four years of research and survey results, identify