Relações entre formas de fósforo inorgânico, fósforo disponível e material vegetal em solos sob vegetação de cerrado: I- Trabalhos de Laboratório
Palavras-chave:
fósforo disponível, calagem solo, extratores fósforo, fósforo inorgânico, amostras solosResumo
In nine samples of Dark Red Latossolo in the Triângulo Mineiro, Minas Gerais, the inorganic and available forms of phosphorus were determined in order to study the relationship between the two.
The forms of inorganic phosphorus were determined according the Chang & Jackson's fractionation and the availabre phosphorus using the North Carolina, Bray 1, Bray 2, HS04 0,05 N and Olsen's extractors.
The determination were made on soil samples with and without liming. The pH of these samples averaged 6,5-7,0 after the liming.
After analysing the data, the following conclusions were drown:
1. The liming increased the phosphorus level in the P-Al, P-Fe, P-Ca forms and the P reductant soluble.
2. The limingalters the level of available phosphorus in a non-uniform way. The alteration depends mainly on the extractor; the Bray l and 2 extract smaller quantities of availa- ble phosphorus in soils that have been exposed to liming.
3. The levels of available phosphorus, obtained with the various extractors, correlated significantly with each other in the unlimed samples.
4. The P-Alform is the only one that correlates well with the level of available phosphorus obtained with North Carolina, Bray | and Bray 2 in soils with and without liming, and with Olsen's extractor in samples of soils without liming.
5. The P-Fe form correlate with the levels of availa- ble phosphorus in samples of limed soils, when the Bray 1 and extractors are used. The regression coefficient for the P-Al form is not significant.
6. The P-Ca form doesn't correlate with the levels of available phosphorus obtained on these soil samples regardless of the extractors used.
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