Changes in soil pH and phosphorus availability during
decomposition of cover crop residues
The aim of this study was to determine the effect of
winter cover crops (CC) residues on soil pH and phosphorus (P) availability.
Three incubation assays were performed in pots using two CC: vetch (V) (Vicia villosa Roth.) and oats (Oa)
(Avena sativa L.). Soil samples were taken from ten sites at 0-20 cm depth. The
rate of residues were 0 (D0), 10 (D1), 20 (D2), 30 (D3) and 40 (D4) g dry
matter kg-1 soil and the soil sampling was after 10, 20, 30, 60, 90 and 120
days of incubation. Soil pH, extractable P (Pe), and soil organic matter (SOM)
and its fractions were determined. The pH increase was correlated with the rate
applied (D1< D2< D3< D4). No differences were found for pH comparing V
and Oa residues with low residue rates. Soil pH changes were dependent from
initial pH and SOM fractions in different soils across the incubation period.
The multiple regression models showed that the pH changes were dependent on
initial pH level and SOM fractions with a high R2 (0.81). Cover crops residues
and its quantities produced different changes on pH - especially at the
beginning of the incubation- which influenced the P availability.
Vicia villosa, Avena sativa
Vanzolini J.I., J.A.
Galantini, J.M. Martínez, L. Suñer. 2017. Changes in soil pH and phosphorus
availability during decomposition of cover crop residues. Archives of Agronomy and Soil Science 63 (13) 1864-1874. http://dx.doi.org/10.1080/03650340.2017.1308493
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