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Table 2 Correlation coefficients of net photosynthetic rate (Pn) and other gas exchange parameters in various treatment groups: 1 and 10 days before the first irrigation (respectively T1, T10) and 1 day before the second irrigation (E1) after seedling emergence during 2016–2017 (n = 30)

From: Photosynthetic characteristics of cotton are enhanced by altering the timing of mulch film removal

Year Treatment groups Cond Ci Trmmol WUE WUEi Ls LUE
2016 CK 0.926** 0.433* 0.919** 0.021 −0.654** −0.589** 0.971**
  E1 0.882** −0.011 0.809** 0.192 −0.461* −0.302 0.966**
  T1 0.938** 0.541** 0.830** 0.218 − 0.855** − 0.784** 0.934**
  T10 0.939** 0.553** 0.875** 0.193 −0.872** − 0.801** 0.942**
2017 CK 0.478** −0.331 0.590** 0.411* 0.305 0.358* 0.807**
  E1 0.480** −0.516** 0.655** 0.449* 0.497** 0.559** 0.899**
  T1 0.094 −0.768** 0.283 0.775** 0.801** 0.825** 0.889**
  T10 0.432* −0.453* 0.757** 0.376* 0.328 0.423* 0.871**
  1. Note: Pearson correlations were used. * Significant at the 0.05 probability level (two tailed). ** Significant at the 0.01 probability level (two tailed)
  2. Cond Conductance to H2O, Ci Intercellular CO2 concentration, Trmmol Transpiration rate, WUE Water use efficiency, WUEi Intrinsic WUE, Ls Limiting value of stomata, LUE Light use efficiency