The Effect of Wood Mulch Type and Depth on Weed and Tree Growth and Certain Soil Parameters

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Figure 1.
The PVC oxygen chamber that was constructed for the mulch experiment.
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Figure 2.
Percent weed cover and number of weed species from September 1991 to September 1992.
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Figure 3.
Effect of mulch depth on shoot growth of Pinus strobus and Quercus palustris from May 1991 to September 1992.

Table 2.

1992 Season soil temperatures (°C) under Ocm, 7.5 cm, 15 cm, and 25 cm depths of wood mulch.

Mulch depth	June 19	June 28	July 7	July 14	July 23	July 30
0	21.54 A+	22.52 A	21.58 A	23.29 A	19.56 A	20.60 A
7.5	19.76 B	20.24 B	20.85 A	22.08 B	19.41 A	20.20 A
15	18.79 C	17.78 C	19.08 B	19.97 C	18.68 B	18.67 B
25	17.93 D	16.07 D	17.47 C	19.00 D	18.42 B	18.27 B
	Aug. 6	Aug. 14	Aug. 20	Aug. 27	Sept. 6	Seasonal mean
0	21.57 A	21.74 A	19.66 A	24.11 A	20.98 A	21.4
7.5	20.69 A	22.63 A	20.23 A	23.98 A	20.40 A	20.1
15	18.21 B	19.28 B	18.86 B	22.68 B	18.46 B	19.3
25	17.55	17.85 C	18.66 B	21.69 C	17.89 B	18.5

Means followed by the same letter wihin a column are not significantly different at the alpha 0.05 level (according to Duncan’s Multiple Range Test.).

Table 3.

Most common weeds found in the treatments.

↵* Weed species that maintained their top twelve status but changed position in the hierarchy.
Total number of weed species in study 1991. 21 weed species 1992. 43 weed species

Mulch depth	Moisture mean %	Moisture range %	pr>f
0 cm	9.8	4.9-10.8	0.0001
7.5cm	15.5	10.0-19.4
15 cm	16.8	12.7-20.0
25 cm	17.4	14.8-20.1