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Decreases in Exchangeable Magnesium in an Irrigated Soil During 28 Years of Differential Fertilization¹

Sypnosis: 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.

² Assistant Chemists, Department of Soils and Plant Nutrition, University of California Citrus Exp. Sta. The authors wish to acknowledge the cooperation of members of the Department of Horticulture who conducted the field trial from which soil samples were taken.

Received for publication February 2, 1956.