K2O ranged from 0.58 to 2.62 wt.% in the Peshawar piedmont soil, from 1.32 to 3.12 wt.% in the Peshawar floodplain soil and from 1.70 to 2.45 wt.% in the Peshawar lacustrine soil (Table 1).
The iron contents were found in the range of] 2.85 to 7.98 wt.%, 4.25 to 7.85 wt.% and 3.6 to 5.31 wt.% in Peshawar piedmont, Peshawar floodplain and Peshawar lacustrine soil respectively (Table 1).
The soils of Peshawar piedmont and Peshawar flood plain had higher contents of MgO as compared to Peshawar lacustrine soils. All the soil samples of the Peshawar basin had high loads of CaO, K2O and P2O5 compared to the standards fixed for normal agricultural soil.
The P2O5 concentration in the Peshawar piedmont soils varied from 0.25 to 2.56 wt.%, in the Peshawar flood plain soils it varied from 2.12 to 6.90 wt.% and in the Peshawar lacustrine soils it varied from 0.20 to 0.68 wt.%.
The Na contents in the Peshawar piedmont ranged from 0.91 to 2.65 wt.%, from 1.45 to 2.46 wt.% in floodplain and from 1.16 to 2.34 wt.% in the lacustrine soils (Table 1).
Concentration of Fe2O3 in the soil samples of horizon A and B, collected during the month of January in 2003 and 2004, from the Peshawar piedmont soils, Peshawar floodplain soils and Peshawar lacustrine soils of the Peshawar basin were graphically presentd in Figure 3.
The Al2O3 content of the soil samples collected during the month of January in 2003 and 2004 from the Peshawar piedmont, Peshawar floodpain and Peshawar lacustrine soils of the Peshawar basin along with the Al2O3 concentration obtained by Tariq (2001) from the similar soils were graphically presented in Figure 2 and was evident that the Al2O3 content varied with the depth in most of the soils but there was no significant change in the concentration of Al2O3 with the passage of time.
Concentration of K2O (wt.%) in Peshawar piedmont, floodplain and lacustrine soils during different times.
At the confluence of the Skimikin and Tappen valleys, the vineyard possesses finely textured, silty clay loamed, or lacustrine soils
formed in basins of lakes created by glacial melting.