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- W177762175 abstract "Aluminum-rich water treatment residuals (WTR) are being suggested as amendments to immobilize excessive P in Florida soils that sorb P poorly. One of the negative impacts of land application of WTR could be excessive P immobilization that can reduce plant available P. This study evaluated the influence of application rates of WTR and various P-sources on soil and plant available P. In a glasshouse study, bahiagrass (Paspalum notatum Flugge) and ryegrass (Lolium perenne L.) were grown sequentially in a P-deficient top soil of (Immokalee sand [sandy, siliceous, hyperthermic Arenic Alaquods]) amended with four sources of P at two application levels (N- and P-based rates) and three WTR rates (0, 1 and 2.5% oven dry basis). Soils were sampled at planting of each grass and were tested for water extractable P (WEP), iron strip P (ISP), Total recoverable P (TP), and degree of P saturation (DPS). Plant dry matter (DM) accumulation and P uptake were also determined. Soil soluble P as measured by WEP and ISP, was reduced by WTR application. Phosphorus sorption capacity of the sand was improved by more than 75% by applying 2.5% WTR, and DPS reduced below 25% threshold value suggested for Florida soil. Co-applied WTR to N-based rate treatment reduced soil soluble P at planting of each plants, but plants DM yield was not reduced below that observed at P-based rate without WTR treatment. Ryegrass DM accumulation was similar for treatments with and without WTR, but P uptake was reduced with WTR. Thus, WTR has potential to improve P sorption capacity of Florida sand and reduce P loss to the environment with little or no reduction in plant growth, but plant P uptake may be affected." @default.
- W177762175 created "2016-06-24" @default.
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- W177762175 date "2006-01-01" @default.
- W177762175 modified "2023-09-27" @default.
- W177762175 title "Agronomic Impact of Water Treatment Residual Co-applied with Phosphorus Sources to Florida Sands" @default.
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