. 2013 Feb 4;64(5):1403–1411. doi: 10.1093/jxb/ert023

Table 2.

Soil Olsen-P, shoot biomass, grain yield, P concentration, and P uptake under different P supplies at maturity in the field experiments. Data are means of four biological replicates. Statistical differences (P < 0.05) between P supplies are indicated by different superscript letters.

Trait	P supply (kg P ha^–1)
Trait	0	25	50	100	200	400
2010 experiment
Olsen-P (mg kg^–1)	6.7^c	11.5^c	12.0^c	19.5^b,c	44.1^a,b	55.8^a
Grain yield (Mg ha^–1)	3.18^d	4.12^c	4.42^b,c	5.24^a,b	5.92^a	5.66^a
Shoot biomass yield (Mg ha^–1)	7.36^d	8.24^c,d	9.81^b,c	10.90^a,b	12.54^a	12.61^a
Straw P (mg g^–1)	0.35^d	0.40^b,c,d	0.37^c,d	0.48^a,b,c	0.49^a,b	0.55^a
Grain P (mg g^–1)	3.29^c	3.40^c	3.52^b,c	3.56^b,c	3.68^a,b	3.87^a
P uptake (kg ha^–1)	12.88^d	15.71^c,d	19.15^b,c	21.41^a,b	25.17^a	25.68^a
2011 experiment
Olsen-P (mg kg^–1)	4.7^e	6.5^e	9.6^d	17.2^c	32.7^b	53.6^a
Grain yield (Mg ha^–1)	3.43^c	4.86^b	5.77^a,b	5.89^a,b	6.33^a	6.80^a
Shoot biomass yield (Mg ha^–1)	6.80^d	9.35^c	10.77^b,c	11.68^a,b	12.23^a,b	13.41^a
Straw P (mg g^–1)	0.22^b	0.26^b	0.30^b	0.39^a	0.42^a	0.43^a
Grain P (mg g^–1)	2.68^c	2.97^b,c	3.14^a,b	3.38^a	3.45^a	3.37^a
P uptake (kg ha^–1)	11.75^d	15.63^c,d	18.13^b,c	22.16^a,b	24.28^a	25.72^a