A study designed to compare the behavior of different calcium sources in saline soil columns was conducted by the Plant Biochemistry department of the University Jaime I in Castellón, Spain.
Daily irrigations were performed in the soil columns as follows:
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3 irrigations with "normal" water, to equalize the soil columns.
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7 irrigations with saline water (3 mS/cm).
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5 irrigations with 156 ppm of each Calcium source evaluated.
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5 irrigations with water with 3 mS to observe how the effective time of each Calcium source was prolonged.
The findings are presented in this animated graph, in which one can see:
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Calcium Nitrate is the least fixed in the soil, and leeches the most.
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Something similar happens, though to a lesser degree, with Calcium Sulfate (gypsum).
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Calcium leaching happens the least when Stabilized CaO (Alcaplant New) is used.
After the irrigation number 12, Calcium is no longer being applied to the soil, and Calcium Leaching is increased in every case, except for the case of stabilized CaO (Alcaplant New), which delays this effect to the irrigation number 15
In conclusion, Stabilized CaO (Alcaplant New) is the Calcium source that presents the highest stability and retention in the soil evaluated in this study, and is liberated in a controlled and predictable manner. As such, it is the most efficient for the soil and the plant.