Table 1.

Average twig growth after four consecutive years of slow-release N application and PBZ application in Year 1.

SpeciesNitrogen rate (kg N/100 m2)PBZ (g a.i./cm dbh)Average twig growth (cm) after each annual N application
Year 1Year 2Year 3Year 4
Bur oak006.26.8az9.38.2
0.9608.411.9b9.47.9
2.8807.28.8b10.910.5
Bur oak01.29.57.98.46.8
0.961.25.98.910.37.2
2.881.29.38.99.110.0
White oak009.210.412.613.7
0.9607.713.413.410.4
2.8807.89.910.510.5
  • z Values in the same column for the same species and treatment combination followed by different letters were significantly different at P ≤ 0.05.