锦单20是2009年经辽宁省农作物品种审定委员会审定的中晚熟耐密型玉米单交种。近两年具有一定的种植面积。随着生产上用种量的不断扩大,制种面积也逐年增加,但在制种中存在的问题也越来越突出,主要表现 Jin Dan 20 is approved by the Liaoning Provincial Crop Variety Approval Committee in 2009 in the late maturing tight-maize single cross. Nearly two years have a certain acreage. With the continuous expansion of seed production, seed production area has also increased year by year, but the problems in seed production have become increasingly prominent, the main performance