Daughtry C S T,Walthall C L,Kim M S,et al.Estimating corn leaf chlorophyll concentration from leaf and canopy reflectance[J].Remote Sensing of Environment,2000,74(2):229~239.
[2]
Hansen P M,Schjoerring J K.Reflectance measurement of canopy biomass and nitrogen status in wheat crops using normalized difference vegetation indices and partial least squares regression[J].Remote Sensing of Environment,2003,86 (2):542~553.
Ma B L,Yah W,Dwyer L M,et al.Graphic analysis of genotype,environment,nitrogen fertilizer and their interactions on spring wheat yield[J].Agron.J.,2004,96(1):169~180.
[5]
Badra A,Parent L E,Desjardins Y,et al.Quantitative and qualitative responses of an established Kentucky bluegrass (Poa pratensis L.) turf to N,P,and K additions[J].Canadian Journal of Plant Science,2005,85(1):193~204.