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. 2020 Jun 3;11:721. doi: 10.3389/fpls.2020.00721

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Copyright © 2020 Elsalahy, Bellingrath-Kimura, Roß, Kautz and Döring.

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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Cover crop aboveground biomass (CCB, dry matter; A) and water use efficiency (WUE; B) of alsike clover (AC) and black medic (BM) in monocultures and a 1:1 mixture of the two species (Mix) in response to six intensities of cumulative drought (100, 85, 70, 55, 40, and 25% WHC) visualized in black gradient color. Vertical bars represent Tukey’s HSD test (p < 0.05) at a given WHC (%) of n = 4. Asterisks above the vertical bars indicate significant differences among the mean of the monocultures and the mixture at each drought intensity (WHC; %) based on one-way ANOVA at P < 0.05. However, asterisks next to the factors DIV, CD, and DIV × CD indicate significant effects based on ANOVA results of the generalized linear model; ^∗∗∗P < 0.001, ^∗P < 0.05.