Evaluation of Potassium Release from Selected Soils of Qazvin Province

Subject Areas : agriculture

jila shafiee ¹ , Kamran Eftekhari ^{2 *} , Ahmad Heidari ³ , Ali Mohammadi Torkashvand ⁴ , Baharak Motamedvaziri ⁵

1 - Research and Development Branch, Islamic Azad University, Tehran-Iran
2 - Research Assistant Professor, Soil and Water Research Institute, Agricultural Research, Education and Extension Organization (AREEO)
3 - Professore, Soil Science Department, Faculty of Agriculture Technology and Enginering, Agriculture and Natural Reaource Paradis, Tehran University, Tehran, Iran.
4 - Professor, Islamic Azad University, Research Sciences Unit, Tehran
5 - Department of Forest, Range and Watershed Management, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran

Received: 2024-02-20 Accepted : 2024-06-08 Published : 2025-12-03

Keywords: Exchangeable potassium, potassium buffering capacity, potassium release rate, geoform, micromorphology, correlation coefficient. ,

Abstract :

This study emphasizes the importance of comprehending the dynamics of soil potassium and the necessity of customizing potassium management practices to the inherent characteristics of the soil to maximize the effectiveness of potassium fertilizers. To attain the objectives of this research, seven soil pedons were excavated in different soil map units of the study region, according to Geopedology approach. Necessary soil characteristics were measured. Micromorphological analyses were conducted to identify soil minerals in components larger than 2 mm and to determine their relationships. The amount and rate of potassium ion release from the exchange and structural phases were measured in natural soil samples. Based on the laboratory findings, the soils were classified into groups of low, moderately low, moderate, relatively high, and high exchangeable potassium, respectively. The soil thin sections in the high exchangeable potassium content soil group revealed significant amounts of potassium feldspars containing orthoclase along with significant quantities of silt-sized mica minerals. All soil map units had high regression coefficient values, indicating a strong correlation between applied CaCl2 and released potassium. Map unit 20 had the highest correlation coefficient square value (R2=0.9887). Based on the soil potassium buffering capacity, map unit 23 had the highest average of released potassium at 71.7 mg/kg and the area under the curve at 17208 mg/kg. Map unit 3 had the lowest soil potassium buffering capacity with the lowest average of released potassium (30.05 mg/kg) and the lowest area under the curve (7212 mg/kg).

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