两条良种繁育技术路线相关理论问题的讨论

三圃制和四级种子生产程序（简称四级程序）是两条不同的良种繁育技术路线，从作物与环境的关系，良种繁育过程中不同的选择方法及良繁种群的群体遗传学理论等方面，就三圃制和四级程序的相关理论问题进行了讨论，希望通过这种讨论，能够对两条技术路线在良种繁育实践中的作用意义和地位有为全面深刻地认识，以进一步推动良种繁育科学研究的深入开展。

Study on the Relative Theoretical Problems of the Two Improved Variety Breeding Technical Routes

Triple-nursery system and four-stage seed-production procedures (Four Procedures for short)aretwo dlfferent improved variety breeding technical routes. In this article,from the aspects of the connectionsbetween crops and environment,the different selective ways in the course of breeding improved seeds and thecolony genetics theory on the seed groups of improved variety breeding and so on,we discussed the relativetheoretical problems of triple-nursery and four-procedures. Through thls discussion,we hope to havc a deeperand more comprehensive realization on the functions,significance and position of the two technical routes inthe practice of breeding improved seeds,so as to further promote the thorough development of the scientificresearch on the improved variety breeding