Abstract
Abstract Paclobutrazol was applied 30 Mar. 1984 as a soil drench to 3rd-leaf pecan [Carya illinoensis (Wangenh.) C. Koch] ‘Cheyenne’ at concentrations between 0.05 to 2.60 g a.i./cm2 trunk cross-sectional area. Paclobutrazol inhibited tree growth, shoot extension, and trunk and limb growth during 1984 and 1985. Relative water content of leaflets was positively related and leaflet area was negatively related to paclobutrazol concentration. Paclobutrazol promoted lateral branching on a unit length basis on 1983 wood, although no significant relationship was apparent on 1984 wood. Leaflet weight under stress and turgid conditions was reduced with increasing paclobutrazol concentration. Net CO2 assimilation rate, leaf conductance, transpiration rate, leaf chlorophyll, and kernal weight measured during 1985 were not affected by paclobutrazol. The effects of soil-applied paclobutrazol under field conditions persist at least 3 years. Chemical name used: P-[(4-chlorophenyl)methyl]-α-(1,1-dimethylethyl)-1H-1,2,4-triazole-1-ethanol (paclobutrazol).
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