Table 1: Physical and chemical properties of the five desert sand samples.

Physical and chemical properties Sample
Pt Tp Tt Zs Ss
C (mg/kg) 11 11 15 12 14
N-NH4 (mg/Kg) 1.1 1.3 1.2 1.1 1.7
N-(NO3+NO2) (mg/Kg) 0.7 1.6 2.5 1.8 1.2
P (mg/kg) 2.1 2 3 1.7 1.7
K (mg/kg) 33 54 59 38 48
pH 7.28 7.69 7.55 7.29 7.38