Abstract: The split‑plot test design was adopted，the main plot was sowing date，with three sowing dates of June 10（T1），June 17（T2）and June 24（T3）；the sub‑plot was planting density，the planting densities were 60 000 plants/ha（D1），75 000 plants/ha（D2）and 90 000 plants/ha（D3）；the nitrogen amount was used as sub‑sub‑plot，which were 0 kg/ha（N0），180 kg/ha（N1），270 kg/ha（N2）and 360 kg/ha（N3）.The effects of sowing date，planting density and nitrogen amount on the leaf area index，dry matter accumulation，yield，resource utilization efficiency and the contribution rate of different factors were studied，and thus the suitable cultivation mode of summer maize in the south of Huanghuai region was defined.The results showed that sowing date，planting density and nitrogen amount had extremely significant effects on leaf area index，dry matter accumulation，yield and resource utilization efficiency of summer maize. Summer maize leaf area index，dry matter accumulation and transportation，yield and resource utilization efficiency（partial productivity of nitrogen fertilizer，radiation utilization efficiency，heat utilization efficiency）generally decreased with the delay of sowing date，and increased with the increase of planting density，reached the highest value under the nitrogen amount of 270 kg/ha.Compared with the treatment with planting density of 60 000 plants/ha，nitrogen amount of 180 kg/ha and on June 24，the treatment with planting density of 90 000 plants/ha，nitrogen amount of 270 kg/ha sowing on June 10 increased the yield，partial productivity of nitrogen fertilizer，radiation utilization efficiency and heat utilization efficiency by 101.5%，34.2%，116.6% and 97.4% respectively. However，Howing on June 17，the yield of the treatment with planting density of 90 000 plants/ha and nitrogen amount of 270 kg/ha increased by 90.6%，the partial productivity of nitrogen fertilizer，radiation utilization efficiency and heat utilization efficiency increased by 26.6%，100.0% and 87.2%，respectively.The contribution rates of sowing date，planting density and nitrogen amount to the yield and resource utilization efficiency of summer maize were different，nitrogen amount had the largest contribution rate，and sowing date had the smallest contribution rate. Therefore，it was suitable for summer maize in the south of Huanghuai region when sowed during the first twenty days of June combined with planting density of 90 000 plants/ha and nitrogen amount of 270 kg/ha.

Key words: Summer maize, Sowing date, Planting density, Nitrogen amount, Resource utilization efficiency

摘要： 采用裂区试验设计，主区为播期，设6月10日（T1）、6月17日（T2）和6月24日（T3）；副区为种植密度，设60 000 株/hm²（D1）、75 000 株/hm²（D2）和90 000 株/hm²（D3）3个密度；副副区为氮肥用量，设0 kg/hm²（N0）、180 kg/hm²（N1）、270 kg/hm²（N2）和360 kg/hm²（N3）。研究播期、种植密度、氮肥用量对黄淮南部夏玉米叶面积指数、干物质积累量、产量和资源利用效率的影响及其贡献率，明确黄淮南部夏玉米适宜栽培模式。结果表明，播期、种植密度、氮肥用量对夏玉米叶面积指数、干物质积累量、产量和资源利用效率均存在极显著影响。夏玉米叶面积指数、干物质积累量及转运量、产量和资源利用效率（氮肥偏生产力、辐射利用效率、热量利用效率）总体上均随播期的后移而降低，随种植密度的增加而增加，以氮肥用量270 kg/hm² 时最高。与6月24日播种搭配种植密度60 000株/hm²、氮肥180 kg/hm²处理相比，6月10播种搭配种植密度90 000株/hm²、氮肥270 kg/hm2处理的产量、氮肥偏生产力、辐射利用效率和热量利用效率分别提高101.5%、34.2%、116.6%和97.4%，而6月17日播种搭配种植密度90 000株/hm²、氮肥270 kg/hm²处理产量、氮肥偏生产力、辐射利用效率和热量利用效率分别提高90.6%、26.6%、100.0%和87.2%。播期、种植密度、氮肥用量对夏玉米产量和资源利用效率的贡献率不同，以氮肥用量的贡献率最大，播期的贡献率最小。综上，黄淮南部夏玉米宜6 月中上旬播种，同时搭配种植密度90 000株/hm²、氮肥270 kg/hm²。

关键词: 夏玉米, 播期, 种植密度, 氮肥用量, 资源利用效率