Table 5.

Twig growth (cm), leaf area (cm2), and relative chlorophyll rating (SPAD) after two years of N fertilizer application.

SpeciesApplication methodNitrogen rate (kg N/100 m2)Twig growth(cm)Leaf area (cm2)SPAD
Year 1Year 2Year 1Year 2Year 1Year 2
Green ashLiquid injection07.83.973.2az69.029.0a44.0
0.969.77.787.5b66.536.5b43.9
2.8811.83.889.2b60.738.2b43.7
Green ashBroadcast08.15.293.5a77.231.6a39.4a
0.967.74.099.2a76.933.6ab42.0ab
2.8811.55.696.1b71.045.4b44.5b
Black mapleLiquid injection0l20.74.3a10.770.028.8a40.5
0.9634.412.8b12.090.634.4b34.9
2.8835.15.2a12.389.933.9b35.1
  • z Values in the same column for the same species and treatment combination followed by different letters were significantly different at P ≤ 0.05.