Table 1. Characteristics of soil samples.

Sampling
site

Agroecological
zones/
sub-zones^a

Annual rain
fall^a
(mm)

Soil types^a

pH^b

Electrical
conductivity^b
(µS)

Organic
carbon^c
(%)

Western Sandy Plain Sub-Region

 1.

 Dune complex with  scrub and grass Zone-2,  Western dune complex  sub-zone 2.1

100-150

Torripsamments

8.30

195.0

0.05

 2.

 Hard pan Zone-3, Hard  pan soil sub-zone 3.1

150-250

Petrocalcids

Lithic Cambids

Lithic Calcids

8.22

195.0

0.07

 3.

 Sandy plain with  scattered dunes Zone-4,  Sandy plain with <300  mm rain fall sub-zone  4.2

250-300

Torripsamments

Haplocambids

Haplocalcids

8.10

157.4

0.08