SELECTION OF EUCALYPTUS CLONES AND ADJUSTMENT OF POTASSIUM DOSES FOR EXTENDED DROUGHT IN BAHIA SAVANNA

Sampaio, Thalita Fernanda; Dalcin, Tiago Elias; Bogiani, Julio Cesar; Mori, Edson Seizo; Guerrini, Iraê Amaral

doi:10.1590/0100-67622016000600008

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Articles • Rev. Árvore 40 (6) • Nov-Dec 2016 • https://doi.org/10.1590/0100-67622016000600008 copy

SELECTION OF EUCALYPTUS CLONES AND ADJUSTMENT OF POTASSIUM DOSES FOR EXTENDED DROUGHT IN BAHIA SAVANNA

SELEÇÃO DE CLONES DE EUCALIPTO, EM IDADE PRECOCE, E AJUSTE DE DOSES DE POTÁSSIO PARA PERÍODOS PROLONGADOS DE SECA NO CERRADO DA BAHIA

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The use of clones adapted to regions with water deficit caused by well-defined and prolonged dry periods, as happens in the western part Bahia, is a way to overcome water stress. The adjustment of potassium (K) also influences this aspect, because it regulates the opening and closing of stomata, impeding water loss by plants and making them more efficient in water use. Therefore, the aim of this study was to evaluate the performance of eucalyptus clones grown for energy production in response to potassium levels in soil and climate conditions, in the municipality of Luis Eduardo Magalhães, located in western Bahia state. A randomized block with four replications in a split plot was used as experimental design. Six eucalyptus clones (AEC-056, CEA-144, CEA-220, CEA-224, CEA-103 and CEA-1528) and four doses of K2O (0, 30, 60 and 120 kg ha-1) were tested. At two years old, clone 1528 showed greatest productivity, with the tallest height and trunk diameter, while 056 showed the lowest performance. Different K requirements were observed among eucalyptus clones for both growth and productivity.

Keywords:
Water deficit; Eucalyptus growth; Potassium fertilization

Table 1 Equations to estimate the height of plants, the diameter (mm) and the volume (V) in m3/tree of six Eucalyptus clones submitted to doses of K2O in Luis Eduardo Magalhães, BA state.

Clones	Equations	R²	Equations	R²
	Height of plants at 6 months		Height of plants at 9 months
056	Y=0.0066 x²-0.5473 x + 109.86	0.98**	Y=0.0173 x²-1.3743 x + 259.56	0.99**
103	Y=0.0049 x²-0.4852 x + 127.69	0.95*	Not significant ——
144	y=-0.001 x²+ 0.2884 x + 109.91	0.57*	Not significant ——
220	y=-0.0033 x²+ 0.6641 x + 110.77	0.98**	y=-0.0071 x²+ 1.2534 x + 218.26	0.99**
224	Not significant	——	Not significant ——
1528	y=0.3137 x + 139.98	0.82**	y=0.589 x + 287.380.98**
	Height of plants at 12 months		Height of plants at 24 months
056	y=0.6014 x + 313.9	0.80**	y=-0.0001 x²+ 0.0201 x + 10.272	0.55**
103	y=0.3123 x + 363.28	0.98**	y=-8E-05 x²+ 0.0083 x + 11.124	0.49**
144	Not significant	——	y=-9E-05 x²+ 0.011 x + 11.341	0.80**
220	y=0.6819 x + 314.2	0.93**	y=-0.0006 x²+ 0.0785 x + 10.791	0.96**
224	y=-0.0095 x²+ 1.3702 x + 315.01	0.99**	y=-6E-05 x²+ 0.0222 x + 11.106	0.79**
1528	y=0.6748 x + 415.9	0.94**	y=-0.0005 x²+ 0.0731 x + 12.295	0.99**
	Diameter at 6 months		Diameter at 9 months
056	y=0.0006 x²-0.0441 x + 14.765	0.89**	y=0.0012 x²-0.0665 x + 27.353	0.99**
103	y=0.02 x + 15.9	0.75**	Not significant	—
144	y = -0.0004 x²+ 0.0662 x + 16.77	0.42**	y=-0.0008 x²+ 0.1056 x + 31.206	0.48*
220	y=-0.0007 x²+ 0.1144 x + 15.855	0.97**	y=-0.0006 x²+ 0.1627 x + 25.655	0.99**
224	Not significant	——	y=-0.0008 x²+ 0.0986 x + 29.486	0.86*
1528	y=0.0473x + 21.44	0.95**	y=0.0607 x + 36.54	0.98**
	Diameter at 12 months		Diameter at 24 months
056	y=0.0162 x²-0.4383 x + 40.125	0.99**	Y=-0.0012 x²+ 0.2002 x + 84.367	0.96**
103	Not significant	——	y=0.0979 x + 88.36	0.79**
144	y=-0.0075 x²+ 0.389 x + 43.38	0.28*	Not significant	—
220	y=0.2351 x + 38.86	0.87**	y=0.0401 x + 94.22	0.30*
224	y=-0.03 x²+ 1.1246 x + 41.747	0.98**	y=-0.0015 x²+ 0.1999 x + 95.447	0.65**
1528	y=0.1243 x + 56.10	0.53**	y=0.057 x + 93.96	0.48**
Clones		Volume (V) in m³/tree		R²
056		y=-2.5E-06 x²+ 0.0004 x + 0.0432		0.99**
103		Not significant		——
144		y=2E-05 x + 0.07		0.20*
220		y=-4E-06 x²+ 0.0005 x + 0.0558		0.86**
224		y=-4E-06 x²+ 0.0006 x + 0.0582		0.91**
1528		y=-5E-06 x²+ 0.0007 x + 0.063		0.92**

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