دراسة السعة التنظيمية لجهد الصوديوم في بعض ترب محافظة نينوى

الملخص EN

Sodium quantity/intensity curves were applied for exchangeable isotherm system Na+ - Ca+2 suggested by Beckett by using thermodynamic parameters to evaluate fertility status in some rain-fed soils in Nineveh province / northern of Iraq.

Results indicated that all studied soils were of neutral pH with appreciable total and active carbonates content of 182-270, 63-91 gm.Kg-1 respectively, with dominant of chloritized semictite and illite clay minerals in soils clay fraction.

the values ranged widely from 0.25 × 10-3-0.94 × 10-3 mole.L-½, the labile pool of potassium values ranged from 10.91-25.36 c.mole Kg-1, while sodium potential capacity values from 24.76-42.18 c.mole.(Kg.mole-1)-½.

On the other hand Gibbs free energy values- ∆G were negatively spontaneous reactions and ranged from- 7.91 to -0.6 cal.

mole-1 and Gapon selectivity coefficient values ranged between 1.32 - 2.99 L.mole-1.

Lacked in the curvature commonly seen in the quantity / intensity curves for sodium.

Result showed lower values and higher energies of replacement of calcium by sodium, also showed a higher affinity for than.

They also indicated that Na held in these soils in two characteristics types of exchange sites having different affinities for sodium.