of;
Agronomy;
Inner;
Mongolia;
Agricultural;
University;
Hohhot;
010019;
P.R.China;
of;
Biotechnology;
Chifeng;
Academy;
of;
Agricultural;
and;
Animal;
Husbandry;
Sciences;
Chifeng;
024031;
P.R.;
China;
of;
Ecology;
and;
Environment;
Science;
Inner;
Mongolia;
Agricultural;
University;
Hohhot;
010019;
P.R.China;
氮素营养诊断; SPAD值; 马铃薯品种; 叶绿素仪; 动态阈值; 生长时间; 施肥建议; 季节动态;