County-Scale Spatial Variability of Macronutrient Availability Ratios in Paddy Soils

Figure 3

Experimental variograms of TN (a), ln(TP) (b), ln(TK) (c), AN (d), ln(AP) (e), and ln(AK) (f), and their fitted models.

(a)

(b)

(c)

(d)

(e)

(f)