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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Soil Phosphorus Bioavailability and Soybean Grain Yield Impaired by Ruzigrass

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Almeida, Danilo S. [1] ; Rocha, Kassiano F. [1] ; de Souza, Murilo [1] ; Delai, Lucas B. [1] ; Rosolem, Ciro A. [1]
Total Authors: 5
[1] Sao Paulo State Univ, Coll Agr Sci, Dept Crop Sci, BR-18610307 Botucatu, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: AGRONOMY JOURNAL; v. 110, n. 2, p. 654-663, MAR-APR 2018.
Web of Science Citations: 2

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)

FAPESP's process: 14/23707-5 - Availability of phosphorus and soybean yield in crop rotation with Congo grass
Grantee:Danilo Silva Almeida
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 15/04200-0 - Phosphorus conservation in cropping systems
Grantee:Ciro Antonio Rosolem
Support type: Regular Research Grants