Natural Wood Resistance of <i>Mimosa caesalpiniifolia</i> in Field Testing

Araujo, João Batista Silva; Paes, Juarez Benigno

doi:10.1590/2179-8087.012815

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Original Article, Wood Science and Technology • Floresta Ambient. 25 (2) • 2018 • https://doi.org/10.1590/2179-8087.012815 copy

Natural Wood Resistance of Mimosa caesalpiniifolia in Field Testing

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The natural wood resistance of sabiá (Mimosa caesalpiniifolia) was evaluated under field conditions for use in organic agriculture. A total of 97 one-meter length logs with bark and diameter classes (5.0-7.9 and 8.0-11 cm) were fixed (0.4 m) in the soil at a distance of 0.5 m from the edges of a forest fragment in Viana, Espírito Santo, Brazil and evaluated after 5 years and 5 months for their resistance to breaking through the application of manual force. The presence of xylophagous termites and fungi was verified. The percentages of unbroken pieces of wood were 81.82% and 79.24% respectively for the larger and smaller diameter classes. For the smaller diameter class, 52.83% showed moderate to superficial attacks, and the largest diameter class had 61.36%. In this case, 41% of the pieces presented superficial attacks (by termites and fungi) or were not attacked, confirming good performance of the tested wood.

Keywords:
natural durability; fence posts; xylophagous organisms

Sample	Coarse Sand	Fine Sand	Silt	Clay	Textural Class
Sample	(g kg^-1)				Textural Class
1	436	116	105	343	Sandy Clay Loam
2	308	86	164	442	Clay
3	285	94	139	482	Clay

Sample	pH	P	K	Ca	Mg	Al	H+Al	SB	t	T	V	m	OM
Sample	pH	(mg dm^-3)		(cmolc dm^-3)							(%)	(%)	(dag kg^-1)
1	4.9	4.2	52	1.24	0.69	0.85	5.0	2.07	2.92	7.07	29.3	29.1	1.22
2	4.8	2.2	39	1.17	0.59	0.95	5.0	1.86	2.81	6.86	27.1	33.8	1.13
3	4.7	1.4	50	0.84	0.61	1.10	4.5	1.58	2.68	6.08	26.0	41.0	0.63

Condition of the Logs	Damage (Rating)
Sound	10
Surface Attack	9
Moderate Attack	7
Intensive Attack (Heavy)	4
Failure (Broken)	0

Diameter Classes (cm)	Number of Logs	Aerial Part		Underground Part
Diameter Classes (cm)	Number of Logs	Diameter with Bark (cm)	Diameter without Bark (cm)	Diameter with Bark (cm)	Reduction of Diameter (%)
5.0-7.9	53	6.90	6.20	4.70	24.19a
8.0-11.0	44	9.30	8.40	6.40	23.81a
Average	–	8.10	7.30	5.55	24.00

Diameter Class (cm)	Heartwood Diameter (cm)	Sapwood Thickness (cm)	Heartwood (%)	Sapwood (%)	Heartwood: Sapwood Ratio
5.0-7.9	4.30	0.94	49.84	50.16	1.16b
8.0-11.0	6.68	0.84	64.26	35.74	2.07a
Average	5.38	0.89	56.38	43.62	1.57

Diameter Class (cm)	Breakage (%)	Termite (%)	White rot (%)	Brown rot (%)	Damage (Rating)
5.0-7.9	20.80	71.70	84.91	13.21	4.03a
8.0-11.0	17.40	54.35	69.57	26.09	5.30a
Average	19.60	64.90	79.40	19.60	4.60

Damage (Rating)	Condition of the Logs	Diameter Class (cm)
		5.0 – 7.9		8.0 – 11.0
		Number	(%)	Number	(%)
10.0-9.2	Sound	0	0	2	5
9.0-7.4	Surface Attack	6	11	16	36
7.0-4.6	Moderate Attack	22	42	9	20
4.0-0.8	Heavy (Intensive Attack)	14	26	9	20
0.0	Failure (Broken)	11	21	8	18
Total		53	100	44	100

Instituto de Florestas da Universidade Federal Rural do Rio de Janeiro Rodovia BR 465 Km 7, CEP 23897-000, Tel.: (21) 2682 0558 | (21) 3787-4033 - Seropédica - RJ - Brazil
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[1] *Juarez Benigno PaesDepartamento de Ciências Florestais e da Madeira, Universidade Federal do Espírito Santo – UFES, Av. Governador Lindemberg, 316, Centro, CEP 29500-000, Jerônimo Monteiro, ES, Brazil e-mail: jbp2@uol.com.br