Changes of physiological characteristics, element accumulation and hormone metabolism of tea leaves in response to soil pH.

The results of the goodness-of-fit analysis of the OPLS-DA model showed ( Figure 2D ) that after 200 random simulations, the goodness-of-fit R 2 Y value was 0.999 and the predictability Q 2 value was 0.991, which were at highly significant levels ( p < 0.005).

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The results of content analysis of key elements showed ( Figure 2F ) that the content of 18 elements showed an increasing trend with the increase of soil pH, while the remaining 6 elements showed a decreasing trend.

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