Journal
SOIL & SEDIMENT CONTAMINATION
Volume 18, Issue 5, Pages 576-589Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/15320380903113451
Keywords
calcareous soils; irrigation water quality; nutrient leaching; phosphorous
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Knowledge of the rate of decrease of nutrients from soils resulting from poor water quality application is essential for long-term planning of crop production while minimizing the impact on groundwater quality. In this study, we examined the effect of Ca2+ concentration of irrigation water on phosphorus (P) leaching and kinetic release in columns of sandy soil. Phosphorous sorption in the presence of CaCl2 solutions with Ca2+ concentrations of 3, 5, 10, and 15 mM CaCl2 was determined to understand the transport and leaching of P in the sandy soil. The geochemical Visual MINTEQ was used to calculate saturation indices. A considerable number of leachate samples contained P at concentrations that could cause eutrophication. Total P leached from soil due to application of different CaCl2 solutions ranged from 1.7 to 1.8 kg ha(-1) after 20 pore volumes had passed through the soil. Comparison of the leaching experiments results with the kinetic desorption data indicated that leaching removed on average 50 times less P than cumulative P desorbed by successive extractions with different CaCl2 solutions. Leaching in presence of different CaCl2 solutions was controlled by rate-limited dissolution of calcium hydroxyappatite and beta-tricalcium phosphate.
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