IPI International Potash Institute
IPI International Potash Institute

Scientific abstracts

Title:
Effect of Gypsum on Potassium and Iron Release from Phlogopite to Alfalfa
Authors:
Fatemeh Sheikhi Shahrivar, and Hossein Khademi
Published in:
Journal of Plant Nutrition 41(4):509-519 (2018), English

Abstract:

This study evaluated the effects of gypsum on the release rate of potassium (K) and iron (Fe) from phlogopite to alfalfa under greenhouse conditions. The medium was a mixture of quartz sand as filling material, K- and Fe-bearing micaceous mineral (phlogopite) and different levels of gypsum (0%, 2%, 5%, 12% and 25%). During the 6-month cultivation period, the pots were irrigated and/or fed with distilled water and four different nutrient solutions. The results showed statistically significant effects of different levels of gypsum on dry weight and K and Fe concentration of shoots and roots. It seems that an increase in calcium (Ca) concentration, due to the addition of gypsum, changes the equilibrium of K and Fe in the root zone and plant tissues. The results of this study show that the rate of K and Fe release from micaceous minerals is extremely reduced in the presence of gypsum.

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