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Magnesium Nutrition of Avocados under Sand Culture Conditions¹

ABSTRACT

Magnesium deficiency symptoms and associated leaf analysis were produced with Hass variety avocado trees grown under sand culture conditions during a 5-year experiment. Correction of the deficiency by foliar sprays of Mg(NO₃)₂ was compared with root feeding with soluble MgSO₄. Although some response to sprays was observed, it was concluded to be impractical. Deficiency was associated with leaf values of 0.20% Mg or less, with 0.10% indicative of an acute deficiency. Normal ranges are 0.30 to 0.60% Mg.

¹ Contribution of the Department of Soils and Plant Nutrition, University of California Citrus Research Center and Agr. Exp. Sta., Riverside, Paper No. 1395. Presented before Div. IV, Soil Science Society of America, Nov. 23, 1961, at St. Louis, Mo.

² Associate Professor of Soil Science, University of California, Riverside.

Received for publication April 3, 1962. Accepted for publication May 27, 1962.