. 2011 Sep 14;6(9):e24606. doi: 10.1371/journal.pone.0024606

Table 2. Yield and elemental composition for field grown potatoes plants.

	P fertiliser application
	unfertilised		fertilised
	mean	(sem, n = 6)	mean	(sem, n = 3)
Shoot biomass at tuber initiation (g DW plant⁻¹)	147.60	(15.90)	218.20	(5.40)^*
Shoot [P] (mg P g⁻¹ DW)	1.98	(0.10)	5.13	(0.65)^*
Shoot [N] (mg N g⁻¹ DW)	20.93	(1.07)	24.36	(3.25)ns
Shoot [K] (mg K g⁻¹ DW)	60.67	(1.33)	45.87	(4.67)^**
Commercial tuber yield (t ha⁻¹)	34.93	(3.00)	47.16	(2.20)^*

Significance levels are for two sided t-tests, testing for significant differences between the mean values for fertilised and unfertilised treatments.

* = P<0.05,

** = P<0.01, ns = not significant.