Phosphorus availability and dynamics in soil affected by long-term ruzigrass cover crop

• Published in: Geoderma Vol. 337; pp. 434 - 443
• Main Authors: Almeida, Danilo S., Menezes-Blackburn, Daniel, Zhang, Hao, Haygarth, Philip M., Rosolem, Ciro A.
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.03.2019; Elsevier Scientific Pub. Co
• Subjects: cash crops; cover crops; Crop rotation; desorption; DET; DGT; Fallow; fertilizer rates; field experimentation; Glycine max; grasses; microbial biomass; microorganisms; no-tillage; phosphorus; phosphorus fertilizers; soil; soil solution; soybeans; Urochloa ruziziensis; viability; PDGT; Rdiff; PDET; R-Rdiff; Presin; k−1; Tc; DGT; SOM; DET; DIFS; R; PE; Crop rotation; Urochloa ruziziensis; Kd; MBP; Fallow; Presin, soil phosphorus extractable with anion exchange pearl resin; Tc, response time of (de)sorption process; MBP, microbial biomass phosphorus; PDGT, DGT measured time average P concentration at the interface of soil and DGT device; PE, effective P concentration; DGT, diffusive gradient in thin films; R, ratio of PDGT and PDET; Kd, equilibrium distribution coefficient between solid phase and soil solution; Rdiff, ratio of PDGT to PE in the case where there is no P resupply from the solid phase; DET, diffusive equilibrium in thin films; k−1, desorption rate constant; DIFS, DGT induced fluxes in soils and sediments model; SOM, soil organic matter; R-Rdiff, relative resupply from solid phase; PDET, soil solution P concentration measured by DET

The use of grasses as cover crops in the off-season of cash crops under no-till has been largely adopted. However, soil phosphorus (P) uptake was previously shown to be reduced when ruzigrass is introduced in the rotation, affecting the viability and sustainability of this cropping system. The objec...