[Objective]Sampling density is closely related to the spatial prediction accuracy of soil organic matter(SOM)in cultivated land.Determining the reasonable sampling density of SOM spatial prediction in cultivated land is beneficial to scientifically guide soil sampling and save work cost.[Method]In this study,taking Yueyang County of Hunan Province as an example,the conditional Latin Hypercube Sampling(cLHS)scheme was designed with R language.Eight training sets with different sampling densities(10.01,7.41,3.70,1.85,0.93,0.46,0.23 and 0.12 sampl...