Table 3 Sequence of predictors for grain Zn concentration (both soil properties and environmental covariates) for testing with the α-investment.

From: Soil and landscape factors influence geospatial variation in maize grain zinc concentration in Malawi

Order

Soil property

Order

Environmental covariate

1

ZnS*

1

Downscaled mean annual precipitation

2

pH

2

Topographic index

3

ZnE

3

Enhanced vegetation index

4

ZnDTPA

4

Slope

5

SOC

5

Downscaled mean annual temperature

6

ZnAR

  

7

eCEC

  

8

Oxalates

  

9

ZnKd

  
  1. *The subscripts AR, S, DTPA, Kd and E denote the total (aqua regia extractable), soluble (calcium nitrate extractable), potentially available (DTPA extractable), the solid-solution distribution coefficient, and the isotopically exchangeable (isotopic dilution) fractions, respectively. SOC denotes soil organic carbon. eCEC denotes effective cation exchange capacity. Oxalates denotes the sum of oxalate-extractable Fe, Al and Mn oxides.
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