Spatial Variability of Physical Soil Quality Index of an Agricultural Field

Table 4

Semivariogram model parameters of physical soil quality indicators of an agricultural field of Ganges Tidal Floodplain soil (classified as Inceptisols order of US Soil Taxonomy), Bangladesh, collected using 10 m × 10 m grid sampling technique.

Physical Soil quality indicators	Model	Nugget	Sill	% Nugget*	Spatial** class	Range
Sand, %	Spherical	3.1	11.2	27.7	Moderate	25
Silt, %	Spherical	1.1	32.1	3.4	Strong	22
Clay, %	Spherical	11.8	27.8	42.4	Moderate	25
Bulk density, g cm^−3	Spherical	0.0005	0.01	5.0	Strong	21
Porosity, %	Spherical	2.3	12.3	18.7	Strong	25
𝐾𝑆^‡, cm day^−1	Spherical	90.5	150.4	60.2	Moderate	30
MWD^#, mm	Spherical	0.03	0.3	10.0	Strong	32

% Nugget = (nugget semivariance/total semivariance) × 100.
∗∗Strong = % Nugget <25%; Moderate = % Nugget 25–75%; Weak or Random = % Nugget >75% Cambardella et al. [32]).
‡Saturated hydraulic conductivity; ^#mean weight diameter.