Plant Responses to Oxygen Supply and Physical Resistance in the Root Environment1
- R. W. Rickman,
- J. Letey and
- L. H. Stolzy2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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