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玉米七三单交种(77×自330)在西南玉米区中占有一定的推广面积,也是贵州省目前主要推广的杂交组合之一。1978年引入我区,经几年试种、推广,表现良好,去年已种植十八万余亩,占全区几个玉米推广组合面积的四分之一以上。玉米单交种表现的整齐一致性好、生长健壮、优势强、增产潜力大已为人所共知,但制种产量低、生产成本高却是当前推广利用单交种上的一个较为突出
The single or triple crosses of maize (77 × from 330) occupy a certain area of popularization in the southwest corn area and are also one of the hybrids that are currently mainly popularized in Guizhou Province. Introduced to our district in 1978, after several years of trial cultivation, promotion, performed well, last year has planted more than 180,000 acres, accounting for the region a few more than a quarter of corn to promote the combination of area. It is well-known that maize single cross breeds show good uniformity, robust growth, strong advantages and great potential for yield increase. However, the low seed production and high production cost are the prominent ones in the current popularization and utilization of single cross breeds