长期定位施肥对设施蔬菜栽培土壤钾吸附动力学的影响

he miscible displacement technique was used to investigate the characteristics of K+ adsorption of long-term fertilization vegetable cultivation soils which were saturated by Ca2+. Results showed that there were significant differences of K+ equilibrium adsorption time and quantity among different treatments, respectively. The adsorption time and quantity were significantly negative related with CEC and soil clay、organic matter and fast-available potassium. There was a fine linear relationship between K+ adsorbing velocity and the reaction time (1nt). Long-term fertilization, except BN1, decreased initial adsorbing velocity and slowed down the adsorption process with different degrees. The First-order equation and Elovich equation were the better models in K+ absorption.