Effects of Growth Medium and Water Stress on Soybean [Glycine max (L.) Merr.] Growth, Soil Water Extraction and Rooting Profiles by Depth in 1-m Rooting Columns

Frontiers in Plant Science
Michael Gebretsadik Gebre, Hugh James Earl

Abstract

The pattern of soil water availability in frequently watered small pots is different from field environments. In small pots, volumetric soil water content (VSWC) is relatively high throughout the rooting zone due to a lack of suction to remove water from large and midsize capillaries. This necessitates the use of growing media with large pore space to avoid anaerobic conditions and so prohibits the use of field soil (FS) in small pots. We hypothesized that in 1-m rooting columns, the 0.01-MPa gravitational potential difference between top and bottom may permit the use of lightly-amended FS as a growing medium and provide for realistic VSWC and rooting profiles by depth. This study aimed to investigate the effects of amending a typical sand-based potting mix with different proportions of FS on soybean growth [dry matter (DM) accumulation], water use, VSWC and rooting profiles by depth under control and water stress conditions, in 1-m rooting columns (polyvinyl chloride tubes having an inside diameter of 10 cm and length of 1 m). We tested three growth media (0, 50, and 67% FS mixes), watered daily to either 100% of the maximum soil water holding capacity (SWHC; control) or 75% SWHC (stress). VSWC was calculated from time-domain ...Continue Reading

References

Nov 10, 2009·Plant, Cell & Environment·Rosemary G White, John A Kirkegaard
Oct 2, 2015·Scientific Reports·Yantai GanLee Poppy
Aug 30, 2017·Frontiers in Plant Science·Jiayin PangKadambot H M Siddique
Nov 14, 2017·European Journal of Agronomy : the Journal of the European Society for Agronomy·L HodgkinsonW R Whalley
Dec 1, 2006·Functional Plant Biology : FPB·John B Passioura

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Citations

Dec 5, 2021·The Plant Journal : for Cell and Molecular Biology·Takashi KuromoriKazuo Shinozaki

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