[Model designing for suitable nitrogen index dynamics of rice and wheat].
By analyzing and extracting the quantitative relationships of suitable nitrogen index dynamics of rice and wheat to their cultivar types, cultural techniques, and eco-environments, a design model for the suitable nitrogen index dynamics of rice and wheat was developed. The model was driven by the physiological development time-based relative growing degree days, with the relative nitrogen indices as modeling parameters, and could be used to generate the time-course indices such as the nitrogen accumulation and concentration of rice and wheat under different growth conditions. Case studies with the datasets from 3-year field experiments in Nanjing showed that the average RMSEs of the simulated to measured plant nitrogen accumulation and concentration were 0.1245 and 0.1316 for rice, and 0.1166 and 0.1301 for wheat, respectively. It was suggested that this model could reliably guide the dynamics of major nitrogen indices of rice and wheat, which would help with the quantitative nitrogen diagnosis and precision nitrogen management of rice and wheat under different eco-environments, cultivar types, and production conditions.
Cao
Jing
J
Jiangsu Key Laboratory for Information Agriculture, Nanjing Agricultural University, Nanjing 210095, China. caojing59323@sina.com
Liu
Xiao-Jun
XJ
Tang
Liang
L
Cao
Wei-Xing
WX
Zhu
Yan
Y
D017753:Ecosystem; D005308:Fertilizers; D008954:Models, Biological; D009584:Nitrogen / Q000032:analysis / Q000378:metabolism / Q000494:pharmacology*; D012275:Oryza / Q000254:growth & development* / Q000378:metabolism; D014908:Triticum / Q000254:growth & development* / Q000378:metabolism
D005308:Fertilizers; D009584:Nitrogen