Mean and standard error of the mean of potato growth responses to changes in environment and genotypes.

SE = Standard error of the mean; ns = non-significant P>0.05; ** = significant P<0.01; *** = significant P<0.001; Light Use Efficiency (LUE) in g DM MJ−1; Harvest Index (HI) in %; Maximum Canopy Cover (MCC) in %; and Dry Tuber Yield (DTY) in t ha−1.