Table 1: Physiochemical properties of iso-humic soil from Chott Mariam.

Depths
0–25 cm25–60 cm60–90 cm90–120 cm

pH8.128.418.568.54
CEC (meq/100 g of soil)19.7222.0423.4523.45
OM (%)0.70.91.11.3
Total C (mg kg−1)1098882552098827093
Total N (mg kg−1)900540510260
N-NO3 (mg kg−1)86.4736.15169.2538.21
N-NH4 (mg kg−1)6.683.293.573.39
Exchangeable P (mg kg−1)93.6820.94.124.99
Exchangeable Na (mg kg−1)57.5232.3533.6124.2
Exchangeable Al (mg kg−1)76.6887.2372.7951.55
Exchangeable Ca (mg kg−1)5450.385508.615874.5617306.04
Exchangeable K (mg kg−1)491.23299.77135.49106.61
Exchangeable Mg (mg kg−1)410.16433.23356.83461.68
Exchangeable Mn (mg kg−1)59.1652.5422.954.22
Exchangeable Fe (mg kg−1)33.5724.629.013.38
Clay (%)12.824.430.525.8
Silt (%)3815.21015.2
Sand (%)49.260.459.559.1
TextureSandy loamSandy loamClayClay loam