Abstract: This study is to find out the effect of the layered bottom application mode of slow-release fertilizer,and provide theoretical basis for the popularization and application of corn simplified fertilization technology.The corn variety Xinrui 25 was used as the experimental material，and the random block design was adopted.The slow-release fertilizer layered(0—15,15—30 cm soil layer) bottom application mode(M1),common fertilizer bottom application mode(M2) and common fertilizer bottom application and topdressing mode (M3) three treatments were set.The results showed that summer maize of M2 mode had high population growth rate and net assimilation rate at the early growth stage，while summer maize of M1 and M3 modes had higher population growth rate and net assimilation rate during the middle and later growth period.The population growth rate and net assimilation rate of M1 mode were significantly higher than those of other fertilizing modes from grain-filling stage to maturity.The dry matter accumulation of M1 mode were significantly higher than that of M2 and M3 modes after tasseling.The dry matter transfer rate and contribution rate of vegetative organs to grain of M2 mode were the highest,which of M1 mode were similar to the M3 mode.There was no significant difference in the grain number per spike and yield between M1 and M3 modes,but they were significantly higher than that of M2 mode.The yield of summer maize in M1 mode was 13.9% and 5.2% higher than that of M2 and M3 modes respectively.The results indicated that the layered fertilization mode could promote the growth and development and improve the accumulation of dry matter at the later stage of summer maize,moreover,it could increase the yield by improving the number of kernels per ear．

Key words: Summer maize, Slow-release fertilizer, Layered fertilization, Growth and development, Dry matter, Yield

摘要： 为了探明缓释肥分层底施模式的作用效果，为简化施肥技术的推广应用提供理论依据，以玉米品种鑫瑞25为试验材料，采用随机区组试验设计，设置缓释肥分层（0～15、15～30 cm土层）底施模式（M1）、普通化肥底施模式（M2）、普通化肥底施+追施模式（M3）3个处理，研究了缓释肥分层底施对玉米群体生长、干物质积累与转运、产量等的影响。结果表明，M2模式夏玉米在生育前期具有较高的群体生长率和净同化率，M1和M3模式夏玉米在生育中后期群体生长率和净同化率较高，灌浆期—成熟期M1模式的群体生长率和净同化率显著高于其他施肥模式。抽雄期之后M1模式的干物质积累量显著高于M2和M3模式。夏玉米营养器官干物质的转运率和对籽粒贡献率均表现为M2模式最高，M1与M3模式相似。M1与M3模式的穗粒数和产量差异不显著，但均显著高于M2模式。M1模式的夏玉米产量分别比M2、M3模式提高13.9%、5.2%。可见，缓释肥分层底施能促进夏玉米生育后期的生长发育，提高夏玉米后期的干物质积累量，通过增加夏玉米的穗粒数提高产量。

关键词: 夏玉米, 缓释肥, 分层施肥, 生长发育, 干物质, 产量