品种的选择过程包括两个方面内容:一是品种更新,即对每年使用经受了各种自然条件的考验,表现出高产、稳产、质佳、抗逆性强的老品种,通过提纯复壮,保持和提高种性,继续利用;二是品种更换,即对一些丰产性能严重下降,严重的混杂,退化,失去利用价值的品种进行淘汰。更新更换是一个科学的选择与决策过程,因此,必须持慎重的态度。本文以 Variety selection process includes two aspects: First, the variety update, that is, each year to withstand the test of various natural conditions, showing high yield, stable yield, good quality, strong resistance to the old varieties, through the purification and rejuvenation, to maintain And improve the species, continue to use; Second, the species change, that is, a number of serious decline in the performance of high yield, serious mixed, degenerated, lost the value of varieties to be eliminated. The replacement and replacement is a scientific choice and decision-making process, therefore, we must adopt a cautious attitude. This article