Synopsis Decreases in exchangeable Mg in the soil of a longterm fertility trial with oranges during 28 years of irrigation and fertilization were calculated by subtracting the values found for samples taken in 1955 from those for samples taken in 1927. These decreases were smallest where manure was used as a source of nitrogen, and largest where NaNO3, and gypsum were added throughout the experiment. Decreases in exchangeable Mg were highly correlated with the amounts of salts added as fertilizers or soil amendments. Sodium nitrate and Ca(NO3)2 were equally effective in decreasing exchangeable Mg, and about doubly as effective as urea.
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Pratt et al. (1957) studied this question.