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Effect of Carbon Dioxide on Cotton Seedling Root Penetration of Compacted Soil Cores
Author(s) -
Tackett J. L.,
Pearson R. W.
Publication year - 1964
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/sssaj1964.03615995002800060019x
Subject(s) - subsoil , penetration (warfare) , seedling , aeration , soil water , carbon dioxide , nutrient , bulk density , limiting , elongation , agronomy , environmental science , chemistry , soil science , materials science , biology , ultimate tensile strength , mathematics , composite material , mechanical engineering , engineering , organic chemistry , operations research
The level of CO 2 and of subsoil density were varied in a growth chamber study of the interaction of these two factors on root growth of cotton seedlings at constant O 2 concentration. At very low density root elongation rate decreased progressively with increasing CO 2 , although moderate to good growth occurred even at 24% CO 2 , the highest concentration used. At higher subsoil level densities, CO 2 had little effect on root penetration. Retardation by CO 2 was somewhat more severe for roots growing into solution culture than for those growing into loose subsoil, indicating that application of results of aeration experiments in nutrient solution to soils should be made with caution. Results suggest that in well‐drained, medium‐to‐coarse‐textured soils such as the Norfolk, CO 2 will seldom be a limiting factor for root growth even in compacted zones near the surface. The mechanical impedance of such zones, will definitely restrict root penetration and proliferation in subsoils.