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- Table 1.
Growth responses of green ash trees to three different placements of fertilizer and two rates.
Caliper increase (cm) Twig growth (cm) 2003 2004y 2002 2003 2004 Entire root zone-full ratez 1.9 1.2b 41.9 63.7 15.5 Inner area-full rate 1.3 2.9a 39.8 73.9 14.0 Inner area-half rate 1.0 1.4b 34.8 61.0 14.0 Outer area-full rate 1.2 1.0b 38.7 74.3 17.0 Outer area-half rate 0.9 0.9b 46.2 60.9 14.6 Control 1.1 1.4b 50.3 64.8 13.3 P value 0.18 0.03 0.84 0.39 0.88 SPAD Leaf Area (cm2) 2002 2003 2004x 2002 2003 2004 Entire root zone, full rate 48.36 47.82 37.99de 72.5 100.9 102.5 Inner area-full rate 48.68 50.20 42.12ae 61.6 110.7 122.2 Inner area-half rate 49.40 44.50 40.72ace 82.5 101.8 160.3 Outer area-full rate 49.96 47.28 40.16de 58.6 102.8 126.2 Outer area-half rate 46.60 43.60 37.69cd 85.1 94.4 146.7 Control 47.42 47.46 36.26bd 77.7 98.7 105.0 P value 0.68 0.60 0.08 0.32 0.72 0.27 ↵zEntire root zone = 4.8 m diameter square, full rate = 1.92 kg N/100 m2, or 0.44 kg N/tree. Square footage or fertilizer amount was halved for other treatments. There were five replications of each treatment.
↵yValues followed by the same letter are not significantly different at P ≤ 0.05
↵xValues followed by the same letter are not significantly different at P ≤ 0.10
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