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. 2020 Mar 27;11:360. doi: 10.3389/fpls.2020.00360

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Copyright © 2020 Li, Schmidt, LaHue, Lazicki, Kent, Machmuller, Scow and Gaudin.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Root distribution by position and (B) root length at different soil depths of tomato plants in subsurface drip irrigation (SDI) and furrow irrigation (FI) systems. Root distribution in (A) was calculated as the difference in the percentage of root length contained in each quadrat between two irrigation treatments. Blue shades represent a higher percentage in SDI than FI, and red shades represent a lower percentage in SDI than FI. Asterisks represent significant differences (p < 0.05) between two irrigation systems. Error bars represent the standard error of the mean.