SEQUENTIAL EXTRACTION OF PHOSPHORUS BY MEHLICH-1 AND ION EXCHANGE RESIN FROM B HORIZONS OF FERRIC AND PERFERRIC LATOSOLS (OXISOLS)

被引:8
|
作者
Camelo, Danilo de Lima [1 ]
Ker, Joao Carlos [2 ]
Novais, Roberto Ferreira [3 ]
Correa, Marcelo Metri [4 ]
de Lima, Vinicio Coelho [5 ]
机构
[1] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, Dept Ciencia Solo, Programa Posgrad Ciencia Solo, Sao Paulo, Brazil
[2] Univ Fed Vicosa, Dept Solos, Vicosa, MG, Brazil
[3] Univ Fed Vicosa, Inst Ciencias Agr, Rio Paranaiba, MG, Brazil
[4] Univ Fed Rural Pernambuco, Unidade Acad Garanhuns, Garanhuns, PE, Brazil
[5] Univ Fed Vicosa, Curso Geog, Vicosa, MG, Brazil
来源
REVISTA BRASILEIRA DE CIENCIA DO SOLO | 2015年 / 39卷 / 04期
关键词
labile phosphorus; iron oxyhydroxides; tuffite; mafic rocks; total digestion; SOILS; ADSORPTION; SPINELS; SURFACE; ROCKS; AL;
D O I
10.1590/01000683rbcs20140405
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
In general, Latosols have low levels of available P, however, the influence of the parent material seems to be decisive in defining the pool and predominant form of P in these soils. This study evaluated P availability by extraction with Mehlich-1 (M-1) and Ion Exchange Resin (IER), from samples of B horizons of Ferric and Perferric Latosols developed from different parent materials. To this end, in addition to the physical and chemical characterization of soils, 10 sequential extractions were performed with M-1 and IER from samples of B horizons (depth between 0.8 and 1.0 m). Total contents of Ca, P, Fe, Al, and Ti were determined after digestion with nitric, hydrofluoric and perchloric acids. The effects of sequential P extractions on Fe oxides were also evaluated from the analyses of dithionite-citrate-bicarbonate and ammonium acid oxalate. The high similarity between contents of P accumulated after sequential extractions with M-1 and IER in soils developed on tuffite indicated a predominance of P-Ca. Higher contents of P after a single IER extraction show greater efficiency in P removal from highly weathered soils, as from the Latosols studied here. The P contents also show the high sensitivity of extractant M-1 in highly buffered soils. Furthermore, a single extraction with extractant M-1 or IER is not sufficient to estimate the amount of labile P in these soils.
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页码:1058 / 1067
页数:10
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