2Alemi M H. Kriging and nnivariance modeling of a spatial correlated date[ J]. Soil Technology, 1988, 1 (12) : 133 -147.
3Robert P C. Precision agriculture:an information revolution in agriculture[ C ]//USDA Agriculture Outlook Forum, No. 32043 1999 : 1 - 5.
4McGraw T, Hemb R. Fertility variability in the Minnesota river valley watershed in 1993, as determined from grid testing result on 52000 acres in commercial fields[ C ]//Site-Specific Management for Agricultural Systems, ASA-CSSA-SSSA, 1995.
5Pierce F J. Yield and nutrient variability in glacial soils of Michigan[ C ] JJSite-Specific Management for Agricultural System, ASA-CSSA-SSSA, 1995.
6Servadio P, Bergonzoli S, Dell' Unto D, et al. Maize yield and physical-chemical fertility mapping for the management of the soil [J]. Journal of Information Technology in Agriculture, 2011, 4( 1 ) : 1 -8.
7Majchrzak R N, Olsen K R, Bollero G, et al. Using soil properties to predict wheat yield on Illinois soils [ J]. Soil Science, 2001,166(4) : 267 -280.
8Mallarino A P, Hinz P N, Oyarzabal E S. Muhivariate analysis as a tool for interpreting relationships between site variables and crop yields[ C]//Proc. of the 3rd International Conference. Minieapolis, MN,1996.
9Anselin L. Spatial effects in econometric practice in environmental and resource economics [ J ]. American Journal of Agricultural Economics, 2001,83 ( 3 ) : 705 - 710.