Remaining phosphorus content to determine phosphorus availability of the soils in Rio Grande do Sul
Abstract: The objective of this work was to evaluate remaining P compared with soil clay content as a P buffer index to classify P extracted by the Mehlich-1 (M1) and Mehlich-3 (M3) methods in soils from the state of Rio Grande do Sul, Brazil. The experiment was carried out in a completely randomized design with five P2O5 rates (0, 50, 100, 200, and 400 mg kg-1) and two sucessive corn crops, and three replicates, in 20 representative soils of the state. P extracted by M1 and M3 before crop planting was adjusted to P contents in biomass, considering soil buffer capacity. The division of soils into different buffering classes, based on soil clay or remaining P, improved the capacity of estimating soil available P of both methods. However, there was no difference among the correlation coefficients obtained by classifying soils according to the evaluated indexes (remaining P or soil clay) for both M1 and M3 methods. Remaining P is a viable alternative to replace soil clay content to classify soil P extracted with the M1 and M3 methods.
| Main Authors: | , , , |
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| Format: | Digital revista |
| Language: | English |
| Published: |
Embrapa Secretaria de Pesquisa e Desenvolvimento
2017
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| Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001201203 |
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