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我县属于鄂西大山区,常年种植玉米35.0万亩,产量占全县粮食总产43％,是我县主要粮食作物。“八五”期间,我县决定把开发利用紧凑型杂交玉米作为农业技术推广的重点项目,计划在本期末推广面积20万亩,总产10万t。1991年在全县共安排28点次。示范面积1.2万亩,总产529.68万kg,单产与平展型玉米相比,紧凑型玉米亩净增115.5kg,增产幅度为35.4％。实践证明,紧凑型杂交玉米在我县大面积示范中表现有早熟、矮秆、抗倒、丰产等突出优点,在山区作为开发项目有着广阔的前景。但是,我们在大量的测产验收中发现,部分田块的紧凑型杂交玉米与平展型杂交玉米相比较,不但没增产,相反是减产,没有真正发挥紧凑型杂交玉米的增产潜力,究其原因,普遍存在以下几个方面的问题。
My county belongs to western mountainous area, perennial planting 350000 mus of corn, the output accounts for 43% of the county’s total grain output, is my county’s main food crops. During the Eighth Five-Year Plan period, the county decided to develop and utilize compact hybrid corn as a key project of agricultural technology promotion. It plans to promote an area of 200,000 mu and a total output of 100,000 t at the end of the current period. In 1991 a total of 28 arrangements for the county. Demonstration area of 1.2 hectares, with a total output of 5,296,800 kg, yield and flat-type corn compared to a net increase of compact corn 115.5kg, increase rate of 35.4%. Practice has proved that compact hybrid corn in my county large-scale demonstration of early performance, dwarf, anti-down, high yield and other prominent advantages in the mountains as a development project has broad prospects. However, we found in a large number of production and acceptance tests that some field plots of compact hybrid maize compared with flat-type hybrid maize, not only did not increase production, on the contrary reduced production, did not really play a compact hybrid corn yield potential, the reason , There are widespread problems in the following areas.