An investigation on the desorption rates of K and P from an Italian Vertisol was carried out using an electro-ultrafiltration system (EUF). Desorption rate parameters as maximum desorbable quantity, half-time and rate constant were determined, when possible, using different extraction procedures. The buffer power of the soil and the effects of K and P applications on kinetics factors were evaluated. Potassium release from soil was described by either zero or second order reaction kinetics, depending on selected EUF procedure, and the effects of K applications were almost always negligible. Phosphorus desorption was better described in all cases by zero order reaction kinetics. A set of equations was reported to characterize the soil with respect to the kinetics of nutrient releases
Mobility of potassium and phosphorus in soil as determined by electro-ultrafiltration (EUF)
BUFO, Sabino Aurelio;
1990-01-01
Abstract
An investigation on the desorption rates of K and P from an Italian Vertisol was carried out using an electro-ultrafiltration system (EUF). Desorption rate parameters as maximum desorbable quantity, half-time and rate constant were determined, when possible, using different extraction procedures. The buffer power of the soil and the effects of K and P applications on kinetics factors were evaluated. Potassium release from soil was described by either zero or second order reaction kinetics, depending on selected EUF procedure, and the effects of K applications were almost always negligible. Phosphorus desorption was better described in all cases by zero order reaction kinetics. A set of equations was reported to characterize the soil with respect to the kinetics of nutrient releasesI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
