黄淮海地区夏玉米超高产栽培技术研究

选用高产、多抗、紧凑型优良玉米品种浚单20作为供试材料，对黄淮海夏玉米的种植密度、产量构成、叶面积指数变化及群体光合势进行分析，研究了黄淮海地区夏玉米超高产栽培技术。结果表明：浚单20在高密度条件下维持了较高的整齐度，叶面积高值持续期达60d以上，整个玉米生育期内PAR_Avg≥300mmol/s/m2的有效光照时数达780h以上。通过高产栽培措施的综合应用，2005年和2007年均实现了超15000kg/hm2的夏玉米高产目标。

Study on Cultivated Technology for Super high yield of Summer Maize in Huanghuaihai Region

Field experiments were conducted to study multiple cultivated technologies for super high yield of summer maize at Huanghuaihai Region with an elite hybrid Xundan 20, which has high and stable yield, multiple resistances and compact structure. Planting density, yield components, agronomic traits, leaf area index and group leaf area duration were analyzed in the study, the results showed that Xundan 20 had long trimness in high density. The high value of leaf areas kept over 60 days, and the effective illumination hours（PAR_Avg≥300mmol/s/m2）were over 780 hours in the whole developing stage. Through the multiple agricultural technology usage, the yield of summer maize in this experiment was above 15000kg/hm2 in 2005 and 2007.