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原种更新周期,指原种在生产上使用的年限。原种更新周期的长短,在棉花良种繁育工作中起着牵动全局的作用。确定棉花原种的更新周期,有些资料报道,借助于原种不同世代的比较试验,提出了一些不同意见,较多的提法是大田生产使用原种第二代。试验的一般做法,是在试验当年收集原种的各个世代的种子参加比较。其弊病在于:试验当年所收集的原种不同世代,系不同年份所生产的原种的后代,由于多种因
The original species update cycle, refers to the original species in the production of life. The length of the original species update cycle plays a global role in the breeding of elite varieties of cotton. Some of the data reported that some different opinions were put forward by means of the comparative experiments of different generations of the original species. The more common formulation is that the second generation of the original species was used in the field production. The general practice of the test is to compare the seeds of all generations of the original species collected in the test year. The drawback is that: the test of the different generations of the original species collected in different years, the descendants of the original species produced in different years, due to a variety of causes