Different methods of potassium analysis and their suitability for Lithuanian soils
2005
Mazvila, J., Lithuanian Inst. of Agriculture, Akademija, Kedainio reg. (Lithuania). Agrochemical Research Centre | Antanaitis, A., Lithuanian Inst. of Agriculture, Akademija, Kedainio reg. (Lithuania) | Lubyte, J., Lithuanian Inst. of Agriculture, Akademija, Kedainio reg. (Lithuania) | Arbaciauskas, J., Lithuanian Inst. of Agriculture, Akademija, Kedainio reg. (Lithuania) | Adomaitis, T., Lithuanian Inst. of Agriculture, Akademija, Kedainio reg. (Lithuania) | Masauskas, V., Lithuanian Inst. of Agriculture, Akademija, Kedainio reg. (Lithuania) | Vaisvila, Z., Lithuanian Univ. of Agriculture, Akademija, Kauno reg. (Lithuania)
The most suitable analysis method for measuring potassium content in the soil of moraine, fluvic and glacial lacustrine origin was selected from the following group: A-L method, 0.238M NaHCO3 + 0.045M (NH4)2SO4; 0.1M CaCl2; 0.0025M MgSO4; 2M HCl; 0.5M CH3COONH4+0.05M CH3COOH + 0,02M Na2EDTA (pH 4.65) is 0.5M CH3COONH4 + 0.05M CH3COOH + 0.02M Na2EDTA (pH 7.0) solutions. The amounts of available potassium in the soil, measured in different extracts, correlated significantly and strongly (eta = 0.75-0.92) with the amount of potassium measured using A-L methods, when soils were of moraine and fluvic origin. The correlation was weaker for soils of glacial lacustrine origin, where the dependence on extraction was irregular. However, the efficacy of potassium in silty loam soils was more dependent on the content of potassium in the soil measured in 0.01M CaCl2 and 0.3 g kgE-1 MgSO4 solvents. As a result, the latter solvents can also be used for potassium content measuring in these soils. Assessment scales of these solvents are presented in this article. Taking into account the versatility of the method, accuracy of the data obtained, and based on our specified assessment scale, preference in potassium content measurement in the soil should be given to the A-L extraction.
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