Study the Quantity and Intensity Relationships of Potassium in Some Soils in Syria

                  Rami Kaba (1)  , Omar Abd AL Razzaq (1)    and   Hussien Al Sulieman (1)

  • Soil sciences Department faculty of  agriculture Al Furat University-Syria  

Received: 15/09/2020                                Accepted: 20/11/2020

Abstract:

The study aimed to assess the availability of potassium in predominance soil orders (Vertisols,  Inciptisols and Aridisols)  in the Syrian AlGazira and under different land uses (fallow – cultivated), using Backett approach a Quantity- Intensity (Q/I) relationships (ARKe activity ratio, labile K (ΔK0), Potential buffering capacity (PBCK), Gapon Selectivity Coefficient KG). Results of thermodynamic criteria, showed that the highest value of the ionic activity of potassium ARKe was in Malikiyah soil Malikiyah soil (Deir Tigris)/ fallow 0.0183 (mol/liter)1/2 and the lowest value for the ionic activity in DierAlzor soil(Sour)/fallow 0.0055 (mol/liter)1/2 and all ARKe values obtained in this study were low but higher than the minimum levels. An increase in the ionic activity values was observed in the Malikiyah and Qamishli soils compared to the DierAlzor soils. As for the labile K (ΔK0) values, The results show that the soil which releases amounts of potassium fixes smaller amount of it as in soils of (Malikiyah and Qamishli soils); these soils contains the Smectite clay mineral. Soils of (DierAlzor) were low in Smectite and high in Mica clay minerals and they fix potassium more than the released quantity, and it has also been observed that the percentage of labile K (ΔK0) values is increased in fallow soils compared to soils The cultivation of the upper horizon in the DierAlzor and Qamishli sites, while the behavior was different in the Malikiyah soils. The values of potassium Potential buffering capacity (PBCK), of the studied soils ranged between (2.128 – 80.432) [cmol kg-1]/(M L-1)0.5]. With a mean of 24.459- 43.269-48.718 [cmol kg-1]/(M L-1)0.5]. for soils DierAlzor (Sour), Qamishli and Malikiyah, respectively. The values of the Capon modulus ranged between 0.491 – 5.246 liters. Mol -1. With averages of 2,923 – 1,301 – 1,243 for for soils DierAlzor (Sour), Qamishli and Malikiyah, respectively. The study provided more accurate information about the potassium dynamics of the soils and play a significant role in the behavior of potassium.

Keywords: Potassium, quantity-intensity relationships, potential buffering capacity, Syria

Full paper in Arabic: PDF