Effect of gypsum on potassium and iron release from phlogopite under laboratory conditions

• Main Authors: Fatemeh Sheikhi Shahrivar, Majid Gholamzadeh, Mohammad Hosseini
• Format: Article
• Language: English
• Published: Soil Science Society of Pakistan (SSSP) 2018-12-01
• Series: Soil & Environment
• Subjects: Nutrient release; micaceous mineral; weathering; DTPA; ammonium acetate
• Online Access: http://se.org.pk/File-Download.aspx?archivedpaperid=831

This study estimated the effects of gypsum on the potassium and iron release rate from phlogopite under laboratory conditions. A randomized design with the factorial arrangement and three replications was utilized to run the current experiment. Treatments included different levels of gypsum (0, 2, 5, 12 and 25%) and eight different time periods (12 hours, 1, 2, 4, 8, 16, 32 and 64 days). The result of this study indicated that the rate of potassium and iron release were faster initially, and it slowed down thereafter. As gypsum content increased, potassium and iron concentrations decreased which is haply due to immense presence of calcium ions. Calcium ions change the equilibrium of K by increasing the amount of gypsum. The results revealed that the potassium and iron release rate from phlogopite is drastically declined in the presence of gypsum.