Phosphorus Use Efficiency in Permanent Pastures in Andisols

The phosphorus (P) availability in volcanic soils is a main limitation for permanent pasture growth. Phosphorus use efficiency (PUE) must be improved to increase forage production with minimum impact on the environment. aim of present study was assess at field conditions PUE, P uptake (PUPE), utilization (PUTE), and nutrition index (PNI) pastures grown different environments under rates sources. Three experiments were conducted Southern Chile. Treatments resulted from factorial combination (i) two sources (phosphate rock triple superphosphate) (ii) rates. High variations PUPE (0.004–0.108 kg kg−1 available), PUTE (189–756 DM uptake), PUE (1.3–42.7 PNI (0.32–1.33) observed across experiments, rates, harvest dates. significantly related PUPE. through negative power function. Therefore, higher or lower PUTEs will result deficiency luxury consumption conditions, respectively. A reference ranging 212 321 proposed optimal nutritional status. first proposing as valuable tool not only status, but also response management factors such fertilization