凉泉公社属高寒山区。1972年引入丹玉六号玉米,增产潜力确实很大,但是不完全适应当地高寒山区的气候特点,秋后往往不能成熟。涌泉大队农科队破除迷信,大胆实践,发现配制丹玉六号的母本“旅28”有筒彤和锥形两种类型,锥形比筒形早熟。1974年他们用父本“330”和锥形“旅28”配制新的丹玉六号单交种。据1975年试验,比丹玉六号早熟7～10天(生育期121天),植株低 Liangquan commune is alpine mountains. The introduction of Dan Yu 6 corn in 1972, the yield potential is indeed great, but not fully adapted to the local alpine mountain climate characteristics, the fall often fail to mature. Yongquan Brigade agricultural team to get rid of superstition, bold practice, found that the mother of Danyu on the 6th “Brigade 28” with Tong Tong and cone two types of cones than the barrel precocious. In 1974, they used the paternal “330” and the cone “Brigade 28” to formulate a new Dan Yu VI single cross. According to the 1975 trial, than the Dan Yu 6 premature 7 to 10 days (growth period of 121 days), low plants