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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Soil Phosphorus Bioavailability and Soybean Grain Yield Impaired by Ruzigrass

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Autor(es):
Almeida, Danilo S. [1] ; Rocha, Kassiano F. [1] ; de Souza, Murilo [1] ; Delai, Lucas B. [1] ; Rosolem, Ciro A. [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Sao Paulo State Univ, Coll Agr Sci, Dept Crop Sci, BR-18610307 Botucatu, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: AGRONOMY JOURNAL; v. 110, n. 2, p. 654-663, MAR-APR 2018.
Citações Web of Science: 2
Resumo

Under no-till farming systems, the use of crop rotations with species adapted to low P soils may enhance soil P availability through P cycling. Growing ruzigrass {[}Urochloa ruziziensis (R. Germ. and C.M. Evrard) Morrone and Zuloaga] as a cover crop has shown to increase resin extractable P in soils. However, it is not clear how the next crop responds to ruzigrass in the long term. The objective of this study was to evaluate the long-term effect of growing ruzigrass on soil P availability to soybean {[}Glycine max (L.) Merr.]. The evaluations were performed over 5 yr on a ruzigrass-soybean crop rotation, in Botucatu, Brazil. The treatments were P rates (0, 13, and 26 kg ha(-1)) applied to soybean seed furrows, and ruzigrass or fallow during the off-season. Soil samples were taken after ruzigrass desiccation, and soil P was extracted with resin (P-resin). The use of ruzigrass increased soil organic matter (SOM) by approximately 20% compared with fallow, regardless of P rates, and increased Presin concentration in the 0- to 10-cm soil depth by approximately 10% with 26 kg ha(-1) of P. Surprisingly, grain yield and soybean leaf P concentration were lower after ruzigrass compared with fallow. Resin seemed to be unsuitable to compare P availability in different cropping systems. In the long-term, growing ruzigrass as a cover crop in the off-season decreases P and N availability to soybean, eventually decreasing soybean grain yield. Further studies are needed to understand the mechanisms involved in this unexpected soybean response when cropped in rotation with ruzigrass. (AU)

Processo FAPESP: 15/04200-0 - Conservação do fósforo em sistemas de produção agrícola
Beneficiário:Ciro Antonio Rosolem
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 14/23707-5 - Disponibilidade de fósforo e produtividade de soja em rotação com braquiária ruziziensis
Beneficiário:Danilo Silva Almeida
Linha de fomento: Bolsas no Brasil - Doutorado