Phosphorus availability and environmental risks in potato fields in North Florida

Liao, X.; Liu, G.; Hogue, B.; Li, Y.; Nicholson, Fiona

Phosphorus availability and environmental risks in potato fields in North Florida

2015

Liao, X. | Liu, G. | Hogue, B. | Li, Y. | Nicholson, Fiona

Soil phosphorus (P) availability was compared with Mehlich‐1 soil testing and P fractionation at a research farm (RF) and 32 private farms (PFs) in north Florida. The environmental risks caused by P release were evaluated using the P saturation ratio (PSR). Soil Mehlich‐1 P at the RF and the PFs was 41.9 ± 4.1 and 278 ± 13 mg/kg, respectively. The dominant inorganic P fraction for all farms was NaOH‐Pi (Al/Fe‐bound P) followed by HCl‐Pi (Ca/Mg‐bound P) at most of the PFs but by NaOH‐Po for the RF. Furthermore, the high PSR at the PFs indicated high risks of P loss from soil. To improve P use efficiency and enhance ecological sustainability, better P nutrient management should be implemented for Florida crop production.

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