《Table 2 Semi-variogram models and their parameters for soil nutrients》

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《"Spatial variability of soil total nitrogen,phosphorus and potassium in Renshou County of Sichuan Basin,China"》

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1) TN，total nitrogen；TP，total phosphorus；TK，total potassium.

The best-fitted models and their parameters for matching the experimental semi-variograms are listed in Table 2.The best-fitted model for TP was a spherical model，while the models for TN and TK were both exponential models.The R2 value of the semi-variogram model for TN was 0.79and the values for TP and TK exceeded 0.9，suggesting the spatial structures of the three soil nutrients were well-fitted with the selected semi-variogram models.