四级种子生产程序及其应用

我国长期沿用的农作物良种繁育方法“三圃制”，存在许多弊端，已不适应农业发展形势的需要。在多年农作物良种繁育实践中研究总结出的“四级种子生产程序”，能有效地保持优良品种纯度和种性。节约种源，减少世代，有利于实现种子标准化，延长使用年限。经济简便，解放了生产力。使育、繁、推一体化，形成了合力。该方法以现代遗传学作为理论基础。几年来，已迅速在河南省大部分地市推广应用，效益显著。

Four - stage Seed - producing Procedures and Its Application

There are many disadvantages in Three seedling Nursery System, the breeding method of the improved varieties of crops, having been applied in our country .which can not adapt to the necessity of the development of agriculture. Foui-stage Seed - producing Procedures summarized from the practical research for many years on the breeding of the improved varieties of crops can be used to keep the purification and quality of the improved varieties effectively. It can also save the sources of seeds, reduce the generations, do good to the realization of seed standardization and prolong the years of growing. It is economic, simple and conve nient, liberating the productive forces, making the breeding, reproducing and popularizing as an organic whole, and forming the resultant of forces. The Procedures are theoretically based on the genetics and have been rapidly popularized and ap -plied within most areas of Henan Province, having produced the outstanding profits.