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Table 6 Relative yield (RY), relative yield total (RYT), and competitive balance (CB) index of Helianthus tuberosus and Ageratina adenophora under different shade levels

From: Potential use of Helianthus tuberosus to suppress the invasive alien plant Ageratina adenophora under different shade levels

Variables Different shade rates
60% 40% 20% 0%
H. tuberosus RYa 0.982 + 0.017c** 0.959 + 0.017c** 1.019 + 0.019b** 1.119 + 0.013a**
A. adenophora RYb 0.447 + 0.021a** 0.426 + 0.019a** 0.371 + 0.017b** 0.327 + 0.010c**
RYT 0.715 + 0.011a** 0.692 + 0.013b** 0.695 + 0.009b** 0.723 + 0.009a**
CBa index for H. tuberosus 0.787 + 0.057c** 0.812 + 0.046c** 1.012 + 0.056b** 1.231 + 0.033a**
  1. Data are expressed as mean ± standard deviation. Different letters within the same row signify significant differences at P < 0.05. The t-test was used to compare each value with 1.0 and 0; * and ** indicate significant differences at 0.05 and 0.01 levels, respectively