一个柑桔无性选择系,从田间初选,经过品种比较试验、区域化试验、生产性试验,最后到命名推广,一般约需20年左右。在田间初选后,采用同步展开品比、区试和中试,这样虽可缩短2/3的时间,但由于初选后未经筛选,直接投入各项试验,试验规模较大,增加了工作量和试验费用,并带有 A citrus asexual selection system, from the field primaries, after a variety of comparative tests, regionalization tests, production tests, and finally to the naming and promotion, generally takes about 20 years. In the field after the primaries, the use of simultaneous start-up ratio, district test and pilot, although this can be shortened 2/3 of the time, but because of no primaries after screening, directly into the test, the test scale larger and increased Workload and test costs, with