摘要
选择我国近十几年来育成的38个杂交种(组合),在高氮(N225kg/hm^2)、低氮(N112.5kg/hm^2)两个水平下,研究了它们的氮农学效率(产量/施氮量)表现,并探讨了氮素吸收与利用在氮效率中的相对作用。结果表明,氮农学效率、氮吸收效率及氮利用效率在玉米品种(组合)间表现出明显差异。在低氮水平下,供试材料的平均氮农学效率为47.37kg/kg,变幅为15.68～74.95kg/kg。在高氮水平下,供试材料的平均氮农学效率为33.13kg/kg,变幅为10.67～45.37kg/kg。通径分析表明,氮素吸收与利用对于氯农学效率的形成均有直接作用,然而,在低氮条件下,氰吸收效率的作用要明显大小氮利用效率(通径系数分别为0.9347和0.6104),在高氮条件下,则二者的作用相近(通径系数分别为0.8609和0.7499)。
Under high(225 kgN/hm^2)and low(112.5 kgN/hm^2)nitrogen application level,thirty-eight maize hybrids(or combinations)released during past tens of years in China were selected to study the genotypic difference of agronomic nitrogen efficiency (NE)(yield/nitrogen amount).Furthermore,the roles of nitrogen absorption efficiency (NAE)and nitrogne utilization efficiency(NUE)were evaluated.It was showed that great difference of NE,NAE and NUE existed among the hybrids(combinations).Under lower nitrogen level,the NE values varied between 15.68～74.95 kg/kgN with the average of 47.37 kg/kgN.Under higher nitrogen level,the NE values varied between 10.67～45.37 kg/kgN with the average of 33.13 kg/kgN.The path analysis showed that both NAE and NUE affected NE dereetly.While the effect of NAE was stronger under lower nitrogen level,the effects of NAE and NUE on NE were similar under higher nitrogen level.
出处
《中国农业大学学报》
CAS
CSCD
北大核心
1998年第S4期97-104,共8页
Journal of China Agricultural University
基金
"九五"农业部重点(17-04-01专题)
国家自然科学基金(39770438)(39770438)
关键词
玉米
氮农学效率
氮吸收效率
氮利用效率
maize
agronomic nitrogen efficiency
N absorption efficiency
N utiliza- tion efficiency
