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Relationship between P and N Concentrations in Corn

^a Agriculture and Agri-Food Canada (AAFC), Soils and Crops Research and Development Centre, 2560 Hochelaga Blvd., Quebec, QC, Canada G1V 2J3
^b AAFC, 430 Gouin Blvd., St-Jean-sur-Richelieu, QC, Canada J3B 3E6

View larger version (31K): [in this window] [in a new window]   Fig. 1. Phosphorus concentration as a function of shoot biomass of corn fertilized with various N rates in an experiment conducted over 2 yr (2004 and 2005) at three sites.

View larger version (31K): [in this window] [in a new window]   Fig. 2. Phosphorus concentration as a function of N concentration of corn in an experiment conducted over 2 yr (2004 and 2005) at three sites.

View larger version (21K): [in this window] [in a new window]   Fig. 3. Phosphorus shoot concentration as a function of N concentration of corn in an experiment conducted at two sites in 2004 and three sites in 2005 under nonlimiting N conditions (NNI 0.90). Solid line, linear regression [P = 1.00 + 0.094N, R2 = 0.76, P < 0.001, n = 71] for corn; dashed line, model of Bélanger and Richards (1999) for timothy.

View larger version (17K): [in this window] [in a new window]   Fig. 4. Phosphorus shoot concentration as a function of N concentration of corn in an experiment conducted at one site in 2004 and two sites in 2005 under limiting N conditions (NNI < 0.80). Solid line, linear regression (P = 1.00 + 0.094N) for nonlimiting N conditions as presented in Fig. 4; dashed line, linear regression [P = 1.25 + 0.104N, R2 = 0.95, P < 0.001, n = 13] for limiting N conditions.

View larger version (18K): [in this window] [in a new window]   Fig. 5. Phosphorus shoot concentration as a function of N concentration of corn at St-Louis in 2004 and Ste-Catherine in 2005 under limiting (20 kg N ha–1) and nonlimiting N conditions (100 kg N ha–1). Solid line, linear regression (P = 1.00 + 0.094N) for nonlimiting N conditions as presented in Fig. 3; dashed line, linear regression (P = 1.25 + 0.104N) for limiting N conditions as presented in Fig. 4; dotted lines, data from one sampling date.