Data/hora: 02/06/2024 14:21:57

Provedor de dados: | 63
País: | Brazil
Título: | Utilization and fate of phosphorus of different sources applied to cohesive soil of Amazonian periphery
Autores: | Coelho,Marta Jordana Arruda; Aguiar,Alana das Chagas Ferreira; Sena,Virley Gardeny Lima; Moura,Emanoel Gomes de.
Data: | 2017-06-01
Ano: | 2017
Palavras-chave: | P fractions; Hardsetting soil; Aluminous phosphate; Leguminous residues; Nitrogen.
Resumo: | ABSTRACT In the Amazonian region, P is often a primary factor limiting sustainable agrosystems. We compared the efficiencies of local aluminous phosphate (ALP) and single superphosphate (SSP) under a cover of leguminous residues to determine the fate of P sources in an Amazonian soil with hardsetting characteristics. The experiment followed a randomized block design with four replications and the following treatments: ALPU, i.e. ALP plus urea (U); ALPL, i.e., ALP plus leucaena (L); SSPU, i.e., SSP plus urea; SSPL, i.e., SSP plus leucaena; and BS, i.e., bare soil (without residues). To assess the residual values of the P sources, we used a sequence of crops consisting of maize, cowpea and cassava. Both ALP and SSP exhibited low P efficiency in BS. The greatest amounts of P and N uptake in the plots where P sources and leucaena residues were added, as in those covered with leucaena residue, resulted in higher productivity levels. These differences are important for the adoption of beneficial soil management practices and the use of P sources to enhance efficiency in tropical soils. The use of residues increased the P use efficiency of both P sources, as it enhanced the uptake of both N and soluble P. The replacement of SSP with ALP may be advantageous in the second year of planting with high-demand crops, but the P of the SSP retained in the minus soluble fractions may be available if the SSP is used in P-depleting crops combined with no-tillage underneath a mulch of residues.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000300242
Editor: | São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Relação: | 10.1590/1678-992x-2016-0013
Formato: | text/html
Fonte: | Scientia Agricola  v.74 n.3 2017
Fonte: | info:eu-repo/semantics/openAccess