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Plant Responses to Oxygen Supply and Physical Resistance in the Root Environment
Author(s) -
Rickman R. W.,
Letey J.,
Stolzy L. H.
Publication year - 1966
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1966.03615995003000030006x
Subject(s) - compaction , aeration , limiting , greenhouse , environmental science , soil water , soil compaction , agronomy , soil science , mathematics , chemistry , geology , biology , geotechnical engineering , engineering , mechanical engineering , organic chemistry
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.