Selection of a Suitable Extractant for Sequential Leaching of Soil to Evaluate Medium-Term Potassium Availability to Plants

• Published in: Journal of soil science and plant nutrition 2024-03, Vol.24 (1), p.1489-1506
• Main Authors: Paul, Subhadip, Das, Debarup, Barman, Mandira, Verma, Bibhash Chandra, Sinha, Abhas Kumar, Datta, Anindita
• Format: Article
• Language: English
• Subjects: Acetates; Acetic acid; Acidic soils; Agriculture; Alkaline soils; Ammonium; Availability; Barium; Barium chloride; Biomedical and Life Sciences; Cation exchange; Cation exchanging; Cereal crops; Crops; Ecology; Environment; Extractants; Hydrochloric acid; Kinetic equations; Laboratories; Leaching; Life Sciences; Magnesium; Methods; Minerals; Original Paper; Parameters; Plant Sciences; Potassium; Rate constants; Regression models; Resins; Soil properties; Soil Science & Conservation; Soils; Sorghum; Water chemistry
• ISSN: 0718-9508; 0718-9516
• DOI: 10.1007/s42729-024-01654-8

Purpose The study aimed to select an extractant for assessing medium-term potassium (K) availability in Indian soils under controlled environment. Methods Potassium was extracted from five different Indian soils (alkaline alluvial, acidic alluvial, calcareous alluvial, red, and black) with ten successive leachings (18 h of incubation in each) using twelve 0.1 N solutions (acetic acid, hydrochloric acid, acetates, and chlorides of ammonium, sodium, magnesium, calcium and barium). A pot experiment was also conducted taking five crops of sorghum-Sudan grass hybrid. Kinetic equations were fitted to the cumulative K-released by different extractants. Path analysis was performed to comprehend the effect of soil parameters on initial and overall K-release constants, obtained from the best fitted kinetic model. Stepwise multiple-regression was performed to quantify medium-term K-availability based on important soil parameters. Results Total K-leached by barium chloride (BaCl 2 ) showed highest correlation (r 2  = 0.76; P