Effect of potassium on the leaching of chemical species in a soil treated with sewage sludge

Paglia, Edmilson Cezar; Serrat, Beatriz Monte; Freire, Clarice Azevedo de Luna; Sirtoli, Ana Rosa dos Anjos; Veiga, Andrea Mayer

doi:10.1590/s1516-89132006000400004

Cited by 1 publication

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References 11 publications

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“…In the last percolation (8), the values of K percolated were still different among rates of KCl, but the difference between the greatest and lowest rate was equal or less than 5 mg L −1 . The increase on K mobility in the soils is directly related to the increase of K in the soil solution, which depends on soil CEC (Paglia et al 2006) and available K (Ernani, Ribeiro, and Bayer 2007;Alfaro, Gregoryb, and Jarvisc 2004). Thus, addition of K over the soil surface, as has been done on no-till systems, should not restrict K availability to crops over time unless the level of available K in the soil is low.…”

Section: Resultsmentioning

confidence: 99%

Liming Decreases the Vertical Mobility of Potassium in Acidic Soils

Ernani

Mantovani

Scheidt

et al. 2012

Communications in Soil Science and Plant Analysis

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Liming increases soil negative charges and thus affects the chemical equilibrium of cations between the solid phase and the soil solution with consequences for the mobility of cations. The effects of lime and potassium chloride (KCl) addition on the vertical movement of potassium (K), calcium (Ca), and magnesium (Mg) were investigated in two Brazilian soils. The experiment was carried out in leaching columns. Treatments included a combination of rates of KCl (0, 50, 100, and 200 mg kg −1 K) and acidity levels (without and with liming). Seven water percolations (400 mL per column) were performed at weekly intervals, totaling an equivalent to 357 mm of rain. Raising the soil pH decreased the leaching of K, in both soils, up to 50% because of the increase of its electrostatic adsorption on created negative charges. Addition of KCl increased the percolation of K, Ca, and Mg proportionally to the rate applied, and it was more efficient than calcium carbonate to percolate Ca in both soils. Liming must be taken into consideration when K leaching or plant needs of K are estimated in predominantly variable-charge soils.

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Section: Resultsmentioning

confidence: 99%