MACRONUTRIENTS IN THE <i>Eucalyptus Dunnii</i> Maiden ROWS SUBMITTED TO POTASSIUM FERTILIZATION IN VARIABLE CHARGE SOILS

Schneider, Thays; Fonseca, Adriel Ferreira da; Pontes, Laíse da Silveira

doi:10.1590/1806-90882018000100017

Acessibilidade / Reportar erro

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

Articles • Rev. Árvore 42 (1) • 2018 • https://doi.org/10.1590/1806-90882018000100017 copy

MACRONUTRIENTS IN THE Eucalyptus Dunnii Maiden ROWS SUBMITTED TO POTASSIUM FERTILIZATION IN VARIABLE CHARGE SOILS

MACRONUTRIENTES EM RENQUES DE EUCALYPTUS Dunnii Maiden SUBMETIDOS À ADUBAÇÃO POTÁSSICA EM SOLOS DE CARGA VARIÁVEL

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The contribution of nutrient cycling from eucalyptus residues in an Integrated Crop-Livestock System (ICLS) extracting potassium (K) in deeper layers and releasing on the surface should be further investigated in soils with variable charge. The objectives of this study were to evaluate the effects of K rates (0, 100, 200 and 300 kg ha^-1 yr^-1 of K₂O) applied on the soil surface in the entire area in rows of ICLS with eucalyptus, and relate these doses to macronutrient levels in the soil. The implemented experimental design was a randomized complete block using a split plot with three replications. The plot consisted of two rows and subplot by K rates. Soil fertility attributes were conducted at 6, 12 and 30 months after the start of the experiment. Medium to high concentrations of K were observed in profile up to 12 months, and very low concentrations of K were observed in the profile 30 months after the experiment was initiated. High concentrations of Ca, Mg were observed throughout the profile favoring saturation in an effective cation exchange capacity (ECEC). However, high K saturation in ECEC was observed at 6 and 12 months, and this decreased at 30 months of study. No leaching was observed, although acidity was high.

Keywords:
Agrosilvopastoral system; nutrient cycling; Typic Hapludox soil

Table 1 Average concentrations of soil chemical attributes in rows submitted to the K dose treatments 6 months after the start of the experiment.

Layer	Variation	OC	pH CaCl₂	Ca	Mg	K	CEC	ECEC	SB	KECEC	CaECEC	MgECEC	V	m
cm	g dm^-3					mmol_c dm^-3			%
0-5	Row 1	24.0 a	5.0 a	34.5 a	23.1 a	2.3 a	130.9 a	60.5 a	59.9 b	3.8 a	57.3 a	37.9 a	46.3 a	1.0 a
	Row 2	25.5 a	5.1 a	35.1 a	24.3 a	2.3 a	130.0 a	62.2 a	61.8 a	3.8 a	57.0 a	38.6 a	47.9 a	0.6 a
	CV%	9.9	6.4	14.0	28.2	24.1	12.6	12.6	12.5	27.2	13.9	21.6	13.9	166.6
5-10	Row 1	20.4 a	4.5 a	13.7 a	17.71 b	2.0 a	121.9 a	38.3 a	34.0 b	5.8 a	34.4 a	48.0 a	27.3 a	11.8 a
	Row 2	21.0 a	4.4 a	15.5 a	21.07 a	2.0 a	126.9 a	41.8 a	38.5 a	4.9 a	36.4 a	50.5 a	30.6 a	8.3 a
	CV%	12.0	5.3	42.0	32.8	25.6	19.8	27.9	28.2	45.1	25.5	21.2	21.8	62.9
10-15	Row 1	14.4 a	4.2 a	8.8 a	30.7 a	1.3 a	141.9 a	50.8 a	40.8 a	3.7 a	22.4 a	50.2 a	25.0 a	23.8 a
	Row 2	16.2 a	4.3 a	9.5 a	18.6 b	1.3 a	128.4 a	37.5 a	29.4 a	3.6 a	24.6 a	49.5 a	22.8 a	22.3 a
	CV%	18.1	6.2	59.9	134.1	26.8	27.7	74.1	91.5	51.7	48.2	23.5	41.2	45.8
15-20	Row 1	14.3 a	4.1 a	4.9 a	9.4 b	1.3 a	118.0 a	27.3 a	15.6 a	5.2 a	17.4 a	36.7 a	13.6 a	40.9 a
	Row 2	15.4 a	4.0 a	5.1 a	11.8 a	1.1 a	123.2 a	29.7 a	18.0 a	4.0 a	16.8 a	39.0 a	14.6 a	40.3 a
	CV%	16.0	4.7	72.5	37.0	23.3	17.6	23.8	33.1	41.8	59.1	27.5	30.0	35.0
20-40	Row 1	16.6 a	4.1 a	7.5 a	16.4 a	1.0 a	132.4 a	39.0 a	25.0 a	2.6 a	19.4 a	41.3 a	18.8 a	36.7 a
	Row 2	18.0 a	4.1 a	9.9 a	16.4 a	1.1 a	137.0 a	41.2 a	27.4 a	2.8 a	22.6 a	40.2 a	20.0 a	34.4 a
	CV%	13.3	2.3	85.1	41.1	42.6	9.5	21.1	29.4	44.6	81.3	36.9	28.2	24.4
40-60	Row 1	10.9 a	4.1 a	1.0 a	8.6 a	0.7 a	112.0 a	25.0 a	10.3 a	2.9 b	3.9 a	33.7 a	9.0 a	59.6 a
	Row 2	14.5 a	4.2 a	1.1 a	9.7 a	0.6 a	115.1 a	25.8 a	11.4 a	2.4 a	4.1 a	37.6 a	10.0 a	55.9 a
	CV%	26.9	1.3	76.3	32.6	42.5	8.7	11.6	29.2	46.0	67.3	27.8	27.2	16.6

Table 2 Average concentrations of soil chemical attributes in rows submitted to the K dose treatments 12 months after the start of the experiment.

Layer	Variation	OC	pH ₂ CaCl₂	Ca	Mg	K	CEC	ECEC	SB	KECEC	CaECEC	MgECEC	V	m
cm	g dm^-3			mmol_c dm^-3							%
0-5	Row 1	24.6 a	4.8 a	35.5 a	35.3 a	3.2 a	129.8 a	74.7 a	73.9 a	4.2 a	47.6 a	47.3 a	57.1 a	1.0 a
	Row 2	25.3 a	4.8 a	38.1 a	36.5 a	3.2 a	136.4 a	78.4 a	77.8 a	4.1 a	48.8 a	46.3 a	57.2 a	0.8 a
	CV%	9.9	4.6	14.7	16.6	32.3	8.0	10.9	11.2	27.7	11.3	11.0	10.6	91.1
5-10	Row 1	20.8 a	4.4 a	14.7 a	15.5 a	2.5 a	104.3 a	35.9 a	32.7 a	7.0 a	40.7 a	42.3 a	31.8 a	10.1 a
	Row 2	20.4 a	4.4 a	14.6 a	16.8 a	2.4 a	106.6 a	36.3 a	33.8 a	6.6 a	39.8 a	46.3 a	32.3 a	7.3 a
	CV%	14.3	5.3	25.1	26.4	36.6	9.5	13.8	20.1	33.2	19.0	22.6	25.8	88.7
10-15	Row 1	17.2 a	4.0 a	8.2 a	12.7 a	1.9 a	108.8 a	31.1 a	22.9 a	6.3 a	25.8 a	40.1 a	21.2 a	27.9 a
	Row 2	19.2 a	4.1 a	8.1 a	11.9 a	1.8 a	114.3 a	30.1 a	21.7 a	5.8 a	26.3 a	39.5 a	19.5 a	28.4 a
	CV%	17.4	5.6	58.0	32.4	34.9	9.7	14.9	32.3	30.2	48.8	21.5	36.4	52.7
15-20	Row 1	16.3 a	4.0 a	3.9 a	6.7 a	1.3 a	112.5 a	22.7 a	11.8 b	5.6 a	16.4 a	29.3 a	10.9 a	48.8 a
	Row 2	17.6 a	4.0 a	3.2 a	6.9 a	1.2 a	117.3 a	23.5 a	11.2 a	5.1 a	13.5 a	29.4 a	9.9 a	52.0 a
	CV%	10.6	3.1	75.0	26.1	36.9	12.6	15.3	35.3	35.8	67.3	18.2	43.6	27.3
20-40	Row 1	14.9 a	3.9 a	1.8 a	5.5 a	1.1 a	115.9 a	20.6 a	8.5 a	5.1 a	8.2 b	26.0 a	7.5 a	60.8 a
	Row 2	15.8 a	3.9 a	2.3 a	4.5 a	1.2 a	126.4 a	20.7 a	8.0 a	5.6 a	9.2 a	21.1 a	6.5 b	64.2 b
	CV%	18.8	4.3	169.0	48.8	47.4	10.3	16.6	72.6	37.1	127.4	31.5	79.7	27.6
40-60	Row 1	8.4 a	4.0 a	0.9 a	4.5 a	0.6 a	96.0 a	16.9 a	5.9 a	3.4 a	5.1 a	26.4 a	6.2 a	65.1 a
	Row 2	10.0 a	4.0 a	0.6 a	4.8 a	0.6 a	101.4 a	18.0 a	6.0 a	3.5 a	3.5 a	26.1 a	6.1 a	66.9 a
	CV%	25.9	1.3	64.8	30.6	52.0	10.6	12.2	26.9	48.6	63.3	25.2	30.6	10.9

Table 3 Average concentrations of soil chemical attributes in rows submitted to the K dose treatments 30 months after the start of the experiment.

Layer	Variation	OC	pHC aCl₂	Ca	Mg	K	CEC	ECEC	SB	KECEC	CaECEC	MgECEC	V	m
cm	g dm^-3			mmol_c dm^-3						%
0-5	Row 1	23.4 a	4.7 a	46.7 a	29.9 a	1.3 a	150.9 a	79.4 a	78.0 a	1.8 a	60.8 a	35.6 a	51.1 a	1.9 a
	Row 2	24.0 a	4.7 a	45.4 a	35.4 a	1.3 a	156.1 a	83.8 a	82.0 a	1.6 a	56.8 a	39.6 a	52.1 a	2.0 a
	CV%	8.4	5.4	16.0	57.9	25.8	11.3	22.5	22.4	36.8	23.2	36.5	13.0	80.3
5-10	Row 1	24.1 a	4.3 a	31.5 a	29.5 a	0.9 a	144.3 a	67.7 a	61.8 a	1.3 a	46.8 a	42.9 a	42.6 a	9.0 a
	Row 2	24.2 a	4.5 a	32.2 a	36.5 a	1.0 a	152.1 a	75.6 a	69.7 a	1.4 a	42.8 a	47.7 a	45.7 a	8.1 a
	CV%	5.0	6.0	23.3	30.4	33.2	11.4	20.2	21.9	35.7	18.9	17.4	15.7	44.0
10-15	Row 1	18.3 a	4.0 b	25.9 a	41.1 a	0.7 a	163.9 a	79.2 a	67.6 a	0.9 a	31.8 a	52.5 a	41.0 a	14.8 a
	Row 2	18.3 a	4.3 a	32.8 a	41.4 a	0.7 a	166.2 a	87.1 a	74.9 a	0.9 a	36.6 a	48.0 a	44.8 a	14.5 a
	CV%	8.0	6.0	45.8	23.4	40.8	10.7	18.9	21.6	49.6	31.7	21.2	13.8	27.2
15-20	Row 1	17.0 a	4.0 a	12.5 a	44.6 a	0.7 a	159.1 a	70.6 a	57.7 a	1.0 a	17.8 a	62.8 a	36.1 a	18.4 a
	Row 2	18.3 a	4.1 a	11.6 a	53.4 a	0.8 a	167.8 a	78.1 a	65.7 a	1.0 a	15.0 a	67.9 a	39.1 a	16.1 a
	CV%	7.2	4.0	35.6	22.9	42.7	9.6	16.0	18.4	45.1	39.3	11.6	12.1	22.8
20-40	Row 1	17.3 a	3.9 b	4.0 a	21.1 a	0.7 a	122.9 b	40.3 b	25.7 a	1.7 a	10.1 a	51.6 a	20.9 a	36.7 a
	Row 2	17.6 a	4.0 a	4.4 a	22.5 a	1.1 a	137.5 a	42.1 a	28.0 a	2.7 a	10.4 a	53.0 a	20.3 a	34.0 a
	CV%	9.0	5.3	22.9	21.4	57.5	8.1	13.2	19.2	57.5	21.6	10.4	17.1	13.4
40-60	Row 1	17.4 a	4.1 a	3.3 a	13.9 a	0.9 a	117.1 a	30.0 a	18.2 a	3.0 a	11.0 a	46.2 a	15.5 a	39.8 a
	Row 2	17.5 a	4.1 a	4.2 a	15.6 a	0.8 a	125.1 a	32.2 a	20.5 a	2.6 a	12.7 a	48.0 a	16.4 a	36.8 a
	CV%	9.0	1.0	41.1	22.9	49.3	7.5	14.4	22.3	48.0	32.4	11.7	19.0	14.5

Table 4 Regression equations for concentration of macronutrients in different layers of soil, as affected by potassium rates and the interaction of the main factor (rows) and secondary (rates).

Attributes	Unit	Layer	Equation	R²	P
6 months
K	mmol_c dm^-3	5-10 cm	y = 0.0029x + 1.5097	0.94	0.0298
Mg	mmol_c dm^-3	0-5 cm	y = -0.0001x² + 0.0006x + 28.512	0.99	0.0134
CEC	mmol_c dm^-3	20-40 cm	y = -0.0005x² + 0.1898x + 124.9	0.99	0.0253
KECEC	%	0-5 cm	y = 0.0062x + 2.8898	0.97	0.0145
12 months
K	mmol_c dm^-3	10-15 cm	y = 0.0042x + 1.2178	0.95	0.0229
ECEC	mmol_c dm^-3	0-5 cm	y = 0.0328x + 71.628	0.92	0.039
SB	mmol_c dm^-3	0-5 cm	y = 0.0324x + 71.003	0.92	0.0417
KECEC	%	10-15 cm	y = -0.00002x² + 0.0179x + 4.114	0.99	0.0097
30 months
OC	g dm^-3	10-15 cm	y = 0.0001x² -0.0373x + 19.717	0.99	0.0346
CaECEC	%	5-10 cm	y = -0.0004x² + 0.1085x + 42.721	0.99	0.0176
Attributes	Row	Layer	Equation	R²	P
12 months
SB	1	0-5 cm	y = 0.0559x + 65.54	0.93	0.034
SB	2	0-5 cm	^ ȳ=y= 77.8 -	-	-
ECEC	1	0-5 cm	y = 0.0553x + 66.363	0.95	0.0243
ECEC	2	0-5 cm	^ ȳ=y= 78.4 -	-	-
CaECEC	1	20-40 cm	y = -0.00001x² -0.0001x + 0.4387	0.99	0.0479
CaECEC	2	20-40 cm	^ ȳ=y= 9.17 -	-	-

Sociedade de Investigações Florestais Universidade Federal de Viçosa, CEP: 36570-900 - Viçosa - Minas Gerais - Brazil, Tel: (55 31) 3612-3959 - Viçosa - MG - Brazil
E-mail: rarvore@sif.org.br

Acompanhe os números deste periódico no seu leitor de RSS

[1] *Corresponding author.