Abstract
A laboratory experiments was performed on light loamy sand to study the effect of potassium polyphosphate [(KPO3)n], potassium dihydrogen phosphate (KH2PO4), and triple superphosphate+potassium chloride (KCl) on the content and dynamics of soil phosphorus (P) determined by the methods of Egner‐Riehm‐Domingo and Rinkis. Content of available P in soil depended significantly on a form and dose of P‐potassium (K) fertilizer and on calcium carbonate (CaCO3) dose as well as on the duration of the experiment, whereas it did not depend on manganese (Mn), zinc (Zn), and copper (Cu) fertilization. Dynamics of available P content in objects with triple superphosphate+KCl and KH2PO4 did not usually depend on experiment duration, whereas orthophosphate release from (KPO3)n was the highest up to 20 days. Liming, especially up to pH S.88, decreased content of available P in soil and delayed (KPO3)n hydrolysis.
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