Phosphorus adsorption in lowlands of Santa Catarina cultivated with rice and its relation with soil properties

Simonete, Marcia Aparecida; Ernani, Paulo Roberto; Teixeira-Gandra, Claudia Fernanda Almeida; Moro, Letícia

doi:10.5935/1806-6690.20180064

Acessibilidade / Reportar erro

Brasil

Revista Ciência Agronômica

Español English

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

Soil Science • Rev. Ciênc. Agron. 49 (4) • Oct-Dec 2018 • https://doi.org/10.5935/1806-6690.20180064 copy

Phosphorus adsorption in lowlands of Santa Catarina cultivated with rice and its relation with soil properties¹ 1 Pesquisa financiada pelo CNPq; parte da Pesquisa de Pós-Doutoramento do primeiro autor apresentada ao Programa de Pós-Graduação em Ciência do Solo, Centro de Ciências Agroveterinárias/CAV/UDESC

Adsorção de fósforo em solos orizícolas catarinenses e sua relação com atributos do solo

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Soils have different capacities to retain phosphorus (P). In seasonal flooded soils iron (Fe) oxides and hydroxides of poor crystallinity, increase with time, and could be the most important constituent in P adsorption, during the time the soils remain unflooded. The present paper had the objective to determine the maximum adsorption capacity of P (MACP), collected from five selected soils in lowland rice areas in the Santa Catarina state, to search for soil individual parameters that best correlates with maximum adsorption capacity of P (MACP). The rates of P used to determine the MACP were calculated based on the concentration of indigenous P in the soil. The sorption of P and the P in solution data were then fitted to the Langmuir sorption isotherm equations. The results obtained for the parameters 'a' and 'b' (binding energy and MACP, respectively) were correlated with selected soil parameters. The Langmuir equations adequately described P adsorption in the soils. The maximum sorption of P varied widely, ranging from 0.419 to 1,450 mg g^_1, where the organic soil (OXs) presented very high MACP, which could lead to a less availability of the element to the plants. The coefficients of correlation showed a significant association between MACP and the following soil parameters: P indigenous, Fe oxides extracted with ammonium oxalate at pH 3.0 (Fe_o3) and pH 6.0 (Fe_o6), as well as the ratios Fe_o3/Fe_d and Fe_o6/Fe_d, suggersting that these chemical parameters can be utilized to characterize the P adsorption in these soils.

Key words:
Oryza sativa; Isotherm of Langmuir; Flooded soils

Atributo	Soil¹ 1 OXs: Organossolo Háplico Sáprico típico (Haplosaprist)-Jaguaruna; GXbd-G: Gleissolo Háplico tb Distrófico típico (Endoaquents); GXbd-I: Gleissolo Háplico tb Distrófico típico (Endoaquents)-Itajaí; RCXbd-I: Cambissolo Háplico tb Distrófico típico (Dystrudepts)-Itajaí; CXbd-P: Cambissolo Háplico tb Distrófico típico (Dystrudepts)-Pouso Redondo.
Atributo	OXs	GXbd-G	GXbd-I	CXbd-I	CXbd-P
pH (H₂O)	5.6	4.7	4.6	5.0	4.8
OM (g kg^-1)	218	42	35	16	23
Rem-P (mg L^-1)² 2 Remaining P.	13	34	15	27	18
P (mg dm^-3)³ 3 Extracted by Mehlich-1	3.41	2.74	6.02	5.43	3.43
K (cmol_c dm^-3)³ 3 Extracted by Mehlich-1	0.83	0.30	0.89	0.46	0.67
Ca (cmol_c dm^-3)	10.89	0.73	2.70	2.10	4.00
Mg (cmol_c dm^-3)	4.71	0.72	1.42	0.95	1.56
Al (cmol_c dm^-3)	0.00	0.32	1.02	0.39	0.70
H+Al (cmol_c dm^-3)	10.90	10.58	15.40	9.70	9.70
CTCpH7 (cmol_c dm^-3)	27.33	12.65	20.43	13.60	16.63
Sand (g kg^-1)	746	350	59	344	282
Silt (g kg^-1)	73	371	271	386	291
Clay (g kg^-1)	181	299	670	270	427

Solo¹ 1 OXs: Organossolo Háplico Sáprico típico (Hplosaprist)-Jaguaruna; GXbd-G: Gleissolo Háplico tb Distrófico típico (Endoaquents); GXbd-I: Gleissolo áplico tb Distrófico típico (Endoaquents)-Itajaí; RCXbd-I: Cambissolo Háplico tb Distrófico típico (Dystrudepts)-Itajaí; CXbd-P: Cambissolo Háplico tb Distrófico típico (Dystrudepts)-Pouso Redondo.	Parameters² 2 Parameter from Langmuir isotherms, where MACP is the maximum adsorption capacity of P ('b' parameter) and “a” is a constant related to the binding energy of adsorption.		Iron Forms			Ratios
	CMAP (b)	a	Fe_d³ 3 Extracted with ammonium oxalate at pH 6.	Fe_o3⁴ 4 Extracted with ammonium oxalate at pH 3.	Fe_o6⁵ 5 Extracted with dithionite-citrate-bicarbonate	Fe_o3/Fe_d	Fe_o6/Fe_d⁴ 4 Extracted with ammonium oxalate at pH 3.
	mg g^-1	mg L^-1	--------------------- g kg^-1 ----------------------			Fe_o3/Fe_d	Fe_o6/Fe_d⁴ 4 Extracted with ammonium oxalate at pH 3.
OXs	1.450	0.430	11.83	10.03	3.76	0.85	0.32
GXbd-G	0.419	0.810	13.03	5.59	1.10	0.43	0.08
GXbd-I	0.849	0.669	13.51	7.97	1.84	0.59	0.14
CXbd-I	0.693	0.517	17.65	7.11	1.25	0.40	0.07
CXbd-P	0.823	0.796	15.63	8.29	1.82	0.53	0.12

Attribute	Parameter
Attribute	MACP (b)¹ 1 MACP: maximum adsorption capacity of P (parameter “b”).	a² 2 ”a”: constant related to the binding energy of P.
Clay	-0,24^ns ns and * non-significant and significant at 5 % level, respectively (n = 5)	0,45^ns ns and * non-significant and significant at 5 % level, respectively (n = 5)
Organic matter	0,86^* ns and * non-significant and significant at 5 % level, respectively (n = 5)	0,55^ns ns and * non-significant and significant at 5 % level, respectively (n = 5)
Rem-P³ 3 Rem-P: remaining P.	-0,84^* ns and * non-significant and significant at 5 % level, respectively (n = 5)	0,42^ns ns and * non-significant and significant at 5 % level, respectively (n = 5)
Fe_dit⁴ 4 Fedit: extracted with citrate-bicarbonate-dithionite.	-0,43^ns ns and * non-significant and significant at 5 % level, respectively (n = 5)	0,05^ns ns and * non-significant and significant at 5 % level, respectively (n = 5)
Fe_ox3⁵ 5 Feox3: extracted with ammonium oxalate at pH 3.	0,97^* ns and * non-significant and significant at 5 % level, respectively (n = 5)	-0,61^ns ns and * non-significant and significant at 5 % level, respectively (n = 5)
Fe_ox6⁶ 6 Feox6: extracted with ammonium oxalate at pH 6.	0,97^* ns and * non-significant and significant at 5 % level, respectively (n = 5)	-0,64^ns ns and * non-significant and significant at 5 % level, respectively (n = 5)
Fe_ox3/Fe_dit	0,87^* ns and * non-significant and significant at 5 % level, respectively (n = 5)	-0,50^ns ns and * non-significant and significant at 5 % level, respectively (n = 5)
Fe_ox6/Fe_dit	0,90^* ns and * non-significant and significant at 5 % level, respectively (n = 5)	-0,61^ns ns and * non-significant and significant at 5 % level, respectively (n = 5)

Universidade Federal do Ceará Av. Mister Hull, 2977 - Bloco 487, Campus do Pici, 60356-000 - Fortaleza - CE - Brasil, Tel.: (55 85) 3366-9702 / 3366-9732, Fax: (55 85) 3366-9417 - Fortaleza - CE - Brazil
E-mail: ccarev@ufc.br

Acompanhe os números deste periódico no seu leitor de RSS

[1] *Author for correspondence