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Increase in Phosphorus Losses from Grassland in Response to Olsen-P Accumulation

^a Agriculture, Food and Environmental Science Division
^b Biometrics Branch, Agri-Food and Biosciences Institute, Newforge Lane, Belfast BT9 5PX, United Kingdom

View larger version (31K): [in this window] [in a new window]   Fig. 1. Olsen-P (mg kg–1) status in February each year for plots receiving 0, 10, 20, 40, or 80 kg P ha–1 yr–1.

View larger version (33K): [in this window] [in a new window]   Fig. 2. Change in weekly Olsen-P (mg kg–1) status in the plots receiving zero P and 80 kg P ha–1 yr–1.

View larger version (18K): [in this window] [in a new window]   Fig. 3. Weekly dissolved reactive phosphorus (DRP) concentrations in land drainage water for each calendar month for the plots receiving (a) zero P and (b) 80 kg P ha–1 yr–1 for 5 yr (March 2000 to February 2005). The line is drawn through the mean values.

View larger version (35K): [in this window] [in a new window]   Fig. 4. Histograms showing the mean weekly differences in DRP concentrations for the period March 2002 to February 2005 compared with the period March 2000 to February 2002 in land drainage water from plots receiving 0, 10, 20, 40, or 80 kg P ha–1 yr–1.

View larger version (13K): [in this window] [in a new window]   Fig. 5. Average annual total phosphorus (TP) load (kg P ha–1) in overland flow and land drainage water (March 2001 to February 2005) for plots receiving 0, 10, 20, 40, or 80 kg P ha–1 yr–1. P loads in overland flow from the plot receiving 40 kg P ha–1 yr–1 were anomalously low due to instrumentation failure during the summer of 2002. The average weekly Olsen-P concentration (mg P kg–1), from March 2001 to February 2005, is shown above each plot.