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针对淮北砂姜黑土地区夏玉米的生育特点，研究了播期、密度及氮素与掖单19产量的关系。结果表明：6月10日播种，产量可达10564．5kg/hm2。主要措施为密度要达到74235株/hm2，氮素306kg／hm2。随播期推迟，产量会直线下降，明确了该区夏玉米显著减产的临界播期在6月20日。氮素施量和密度与产量均呈二次抛物线关系。单株穗三叶面积与穗粒重呈显著正相关。
According to the characteristics of summer maize in Huaibei area of Shajiang black soil, the relationship between sowing date, planting density, nitrogen and yield of Yedan 19 was studied. The results showed that: June 10 sowing, the output up to 10564.5kg / hm2. The main measures for the density to reach 74,235 plants / hm2, nitrogen 306kg / hm2. Postponed with the sowing date, production will plummet, the critical sowing date for summer maize significantly reduced on June 20. Nitrogen application rate and density showed a quadratic parabola relationship with yield. There was a significant positive correlation between ear clover area and ear kernel weight per plant.