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Plant Growth, Water Use and Nutritional Response to Rhizosphere Differentials of Oxygen Concentration¹

ABSTRACT

Various oxygen level treatments were applied to snapdragons grown in cylinders by varying the oxygen concentration above the soil surface. Other soil physical properties were held relatively uniform during the experiment. The aerial portions, except for part of the stem, were isolated from the rhizosphere treatments. Eight treatments ranging from < 1% to 21% O₂ were applied. In general plant growth increased with higher oxygen levels. The relative content of phosphorus and potassium in shoots increased with increasing oxygen concentration. Sodium content increased with decreasing oxygen and showed a very marked increase at the lowest oxygen levels. Water use decreased with decreasing oxygen.

¹ Contribution from the University of California Agr. Exp. Sta., Los Angeles and Riverside. Presented before Div. I. Soil Science Society of America, Dec. 5, 1960 at Chicago, Ill.

² Assistant Soil Physicist, Associate Soil Scientist, Assistant Irrigation Engineer, and Laboratory Technician II, respectively; Agr. Exp. Sta., University of California, Los Angeles and Riverside.

Received for publication July 13, 1960. Accepted for publication January 30, 1961.