Figure 5

Relationships between net photosynthetic rate and shoot P concentration (a), between leaf area index and shoot P concentration (b), between the product of net photosynthetic rate and leaf area index and shoot P concentration (c), and between shoot P concentration and soil Olsen-P concentration (d) at anthesis across three years. Each data point from one plot in 1 year. *** indicate significance at P < 0.001.