Accumulation of humic substances in an Oxisol fertilized with pig slurry for 15 years

Sacomori, Wagner; Cassol, Paulo C.; Mafra, Maria S. H.; Erdemann, Luiza F.; Almeida, Jaime A. de

doi:10.1590/1807-1929/agriambi.v25n2p109-115

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Articles • Rev. bras. eng. agríc. ambient. 25 (2) • Feb 2021 • https://doi.org/10.1590/1807-1929/agriambi.v25n2p109-115 copy

Accumulation of humic substances in an Oxisol fertilized with pig slurry for 15 years¹ 1 Research developed at Campos Novos, SC, Brasil

Acúmulo de substâncias húmicas em Oxisol adubado com dejeto líquido de suíno durante 15 anos

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The growth of swine production in Brazil has increased the amount of production and use of pig slurry (PS) as soil fertilizer. This product provides nutrients to plants, and a continuous application of this residue usually increases total soil organic carbon (SOC) content. The objective of this study was to determine the SOC content and its distribution into humic substance fractions (humic acids, fulvic acids, and humin) in an Oxisol annually fertilized with PS for 15 years. The experiment was implemented in 2001 with a maize and oat crop rotation under no-tillage system in Campos Novos, SC, Brazil. The treatments used were: PS at rates of 0 (Control), 25, 50, 100, and 200 m³ ha^-1 year^-1, mineral fertilizer, and PS combined with mineral fertilizer, applied on the soil surface once a year. The 0-2.5, 2.5-5, 5-10, 10-20, 20-40, and 40-60 cm soil layers were evaluated for SOC content in the fractions humic acid, fulvic acid, and humin, and E4/E6 ratio of humic substances. Increases in PS rates up to 100 m³ ha^-1 increased the SOC content in the 5-10 cm soil layer; however, decreased the proportion of the soil fulvic acid and humic acid fractions, favoring the accumulation of organic carbon in the humin fraction. The E4/E6 ratio was higher when using the soil mineral fertilizer than that found in treatments with PS.

Key words:
Zea mays; organic fertilizer; organic matter; no-tillage system

Layer (cm)	SOC	FA	HA	HU	E4/E6
0-2.5	0.0259	0.0021	0.0047	0.0003	< 0.0001
2.5-5	0.0218	0.0145	0.0017	0.2111	0.0949
5-10	0.0010	0.0132	0.2599	0.0475	0.2797
10-20	0.0050	0.4977	0.0221	0.0744	0.2908
20-40	0.0041	0.0030	0.4369	0.0121	0.0115
40-60	0.0685	0.0234	0.0045	0.0512	0.1228

Layer (cm)	Control	MF	MF+PS	PS25	PS50	PS100	PS200	CV (%)
Layer (cm)	(g kg^-1)							CV (%)
0-2.5	57.5 b	61.2 ab	66.0 ab	59.7 ab	58.8 ab	75.7 a	75.5 a	12.9
2.5-5	44.4 b	51.2 ab	50.1 ab	48.9 ab	57.9 a	59.1 a	57.1 a	12.8
5-10	34.5 c	39.8 abc	38.4 bc	37.1 bc	37.3 bc	44.8 a	40.3 ab	9.7
10-20	30.2 b	32.2 a	31.0 ab	31.7 ab	30.6 ab	32.3 a	30.8 ab	3.6
20-40	25.2 a	27.2 a	26.6 a	27.0 a	25.5 a	27.4 a	26.2 a	8.1
40-60	22.2 a	23.2 a	22.8 a	22.3 a	22.0 a	21.7 a	22.1 a	6.5

Layer (cm)	MF	MF+PS	Control		PS25		PS50		PS100		PS200		CV (%)
Layer (cm)	SOC (g kg^-1)												CV (%)
Fulvic acids
0-2.5	10.0 a1	9.8 a	8.2 bc		8.1 c		7.8 c		9.1 ab		8.4 bc		11.29
2.5-5	8.7 a	7.6 ab	6.4 b		7.7 ab		7.5 ab		8.2 a		8.7 a		12.05
5-10	6.8 ab	6.1 ab	6.7 ab		5.8 b		5.6 b		7.0 a		6.5 ab		10.32
10-20	5.8 a	6.0 a	5.7 a		5.8 a		5.2 a		5.1 a		5.7 a		10.57
20-40	6.0 a	6.1 a	5.9 a		6.2 a		6.0 a		6.1 a		5.5 a		10.14
40-60	4.9 a	4.9 ab	4.2 ab		4.7 ab		4.5 ab		4.4 ab		4.1 b		10.02
Humic acids
0-2.5	12.2 a1	11.8 ab		8.9 c		9.4 bc		10.0 abc		12.7 a		10.3 abc		16.07
2.5-5	10.2 a	9.0 a		6.1 b		8.5 ab		9.4 a		10.4 a		10.1 a		18.42
5-10	8.0 a	7.9 a		5.9 a		7.6 a		8.0 a		8.7 a		6.9 a		18.43
10-20	4.3 ab	4.6 a		3.4 b		4.3 ab		4.2 ab		4.4 ab		4.8 a		13.53
20-40	4.9 a	4.5 a		3.7 a		4.5 a		4.3 a		4.3 a		3.4 a		22.26
40-60	2.3 bc	2.7 abc		2.1 c		3.2 ab		3.2 abc		3.5 a		3.7 a		22.16
Humin
0-2.5	33.8 bc	36.7 abc		30.5 c		34.4 bc		40.0 ab		42.6 a		43.9 a		14.78
2.5-5	28.7 a	28.0 a		26.8 a		28.5 a		32.3 a		31.2 a		32.1 a		12.29
5-10	23.3 a	23.7 a		22.1 a		22.2 a		26.0 a		26.7 a		25.2 a		13.03
10-20	21.5 a	21.1 a		21.5 a		21.1 a		21.7 a		21.9 a		22.8 a		6.07
20-40	17.4 ab	16.3 ab		17.0 ab		16.2 ab		15.9 b		16.8 ab		18.4 a		7.98
40-60	15.1 a	14.7 a		15.6 a		14.4 a		14.0 a		14.6 a		15.2 a		7.61
E4/E6 ratio
0-2.5	2.89 a	2.52 ab		1.19 c		0.93 c		1.59 bc		2.35 ab		2.36 ab		36.35
2.5-5	2.37 a	2.23 a		0.99 a		1.78 a		1.68 a		2.19 a		1.89 a		33.12
5-10	2.99 a	2.42 a		1.95 a		2.29 a		2.31 a		2.70 a		2.35 a		22.81
10-20	3.09 a	3.17 a		2.20 a		2.90 a		2.77 a		2.78 a		2.85 a		18.38
20-40	4.30 a	3.28 ab		3.52 ab		3.42 ab		2.74 b		2.83 b		3.28 ab		19.93
40-60	4.96 a	4.70 a		4.88 a		4.79 a		4.04 a		4.32 a		4.18 a		15.36

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[1] * Corresponding author - E-mail: wsacomori@yahoo.com.br

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Accumulation of humic substances in an Oxisol fertilized with pig slurry for 15 years1 1 Research developed at Campos Novos, SC, Brasil

Acúmulo de substâncias húmicas em Oxisol adubado com dejeto líquido de suíno durante 15 anos

ABSTRACT

Accumulation of humic substances in an Oxisol fertilized with pig slurry for 15 years¹ 1 Research developed at Campos Novos, SC, Brasil