Phosphorus USE Efficiency

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Presentation transcript:

Phosphorus USE Efficiency Oklahoma State University, Stillwater, OK

Methods YP (uptake, P treated plot) YO (uptake, no P applied) FP (fertilizer P rate) direct method (32P, proportion of added nutrient recovered in the crop) rarely more than 25% difference method (YP-YO)/FP (apparent recovery or apparent efficiency) partial factor productivity index (kg product /kg nutrient applied, or YP/FP) physiological efficiency index (kg product increase/ kg increase in nutrient taken up (YP- YO)/(UP - UO). (YP, YO, UP and UO as above) balance method total P in the crop / P applied (UP/FP)

New 1

New 2

New 3

N Response, same P and K (502)

502 60-40-60 / 60-0-60

502 Yield Increase/Decrease 60-40-60 - 60-0-60

502, P Response

1 ( 0-0-0 ) 2 (0-40-0)

1 ( 0-0-0 ) 2 (0-40-0)