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Poplar hybrids were grown with irrigation in a large-scale plantation to investigate the mechanisms underlying clonal differences in drought resistance. Beginning in spring 1992,  Populus trichocarpa  ×  P. deltoides  (TD) and  P. deltoides  ×  P. nigra  (DN) cuttings received 46, 76, or 137 cm year −1  of irrigation to supplement the 18–20 cm of annual precipitation, and all trees received the same fertilization regime. Stem volume, assessed as the square of stem diameter at breast height times tree height ( D  2  H ), and water relations of the trees were studied from the end of their second growing season until the end of their fifth growing season.

Drought resistance of two hybrid Populus clones grown in a large-scale plantation