Table 1 Most reported soil variables and number of sites.

From: Paired field and water measurements from drainage management practices in row-crop agriculture

Data Variable

No. Sites Reporting

Soil texture (class, %sand, %silt, %clay)†

21

NO3 (conc. or amount)

20

Soil organic carbon, total N

16

pH (measured in water or dilute salt solution)

15

K (conc., sat. or amount)

14

Bulk density, Ca, and Mg (conc., sat. or amount)

13

Cation exchange capacity

11

Mehlich or Bray P (conc. or amount)

9

Soil water characteristics

8

NH4 (conc. or amount)

7

Hydraulic conductivity

6

  1. †All sites have primary, secondary, and tertiary soil series, soil texture, soil drainage class, and soil taxonomic class as reported in the Natural Resources Conservation Service Web Soil Survey11; these data are included in the Site Description file (Table 2). Therefore, for sites without soil samples reported at a plot scale, this external data will help inform users.
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