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Plant Responses to Oxygen Supply and Physical Resistance in the Root Environment¹

ABSTRACT

Limiting and nonlimiting aeration treatments which were monitored with platinum microelectrodes were applied to soil at two levels of compaction in a greenhouse experiment. Total dry weight of tops and depth of root penetration were used to compare tomato (Lycopersuon esculentum ‘Rutgers’) growth under the various treatments. No difference in top growth was detected between the two levels of compaction when oxygen diffusion rate (ODR) values were nonlimiting in both. Roots penetrated compacted layers in which ODR values were non-limiting but their rate of extension was slower than in less compacted layers with nonlimiting ODR. Top growth in soils with low ODR values was reduced regardless of compaction. Root extension in the least compacted soil with low ODR values was less than root extension in that soil with high ODR values.

¹ Paper No. 1688, University of California, CRS-AES, Riverside, California. Paper presented at the Western Soil Science Society, June 21–24, 1965, University of California, Riverside. The research reported in this paper was supported by National Science Foundation Grant GB-84.

² Graduate Student, Associate Professor of Soil Physics, and Associate Soil Physicist, respectively, in the Department of Soils and Plant Nutrition, University of California, Riverside.

Received for publication August 19, 1965. Accepted for publication February 19, 1966.