为了明确吉单96在吉林省中部半湿润区地区的冠层特性，为其创造高产栽培条件，在大田条件下设置了每公顷纯氮用量0kg，150kg，225kg，300kg和375kg共5个氮肥量级和6万株/hm2、7万株/hm2、8万株/hm2、9万株/hm2和10万株/hm2共5个密度梯度。研究不同氮肥量级条件和不同密度梯度下，吉单96的冠层生理及结构指标、产量及产量构成指标。结果表明，冠层叶绿素含量的敏感时期为大喇叭口期和抽雄期，其中大喇叭口期叶片叶绿素含量受氮肥影响最大，抽雄期叶片叶绿素含量受密度影响最大。225-300kg/hm2施氮量且分配60%的追肥可以保持冠层叶绿素在较高水平；叶面积指数受密度调控更显著，7.7-8.0万株/hm2为试验最适密度，可维持最大叶面积指数在5.5左右。在中高肥力条件下，采用7.7-8.0万株/hm2的种植密度和225-300kg/hm2的施氮量，可以维持冠层结构和功能，协调穗粒数和百粒重同步增长，产量可达到12 780.9 kg/hm2。
英文摘要:
IIn order to definite the canopy characteristics and to create high yield cultivation conditions for new high-yield variety Maize Jidan 96 in semi-humid areas of Jilin province, field experiments were carried out. Five nitrogen application rates were designed, which were 0, 150, 225, 300 and 375 kilograms per hectare. Five planting density gradients were designed, which were 60000, 70000, 80000, 90000 and 100000 plants per hectare. The physiological and structure indexes of the canopy, yield characters and yield indexes were studied under different nitrogen application rates and planting density gradients. The results showed that the chlorophyll content was sensitive to the nitrogen and planting density during the flare opening period and the tasseling stage individually. It was necessary to topdressing before the flare opening period. Total nitrogen was controlled at 225-300kg/hm2 and 60% of the amount was used as the topdressing fertilizer. LAI was sensitive to planting density. The optimum density is 77000-80000 plants per hectare, which can maintain the highest LAI at about 5.5. On intermediate-high fertility condition, planting density of 77000-80000 plants per hectare and total nitrogen of 225-300kg/hm2 can maintain canopy structure and function. Coordinated with kernel number per ear and 100-kernel weight increasing synchronously, Jidan 96 can achieve a yield of 12 780.9 kg/hm2.
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