Differences in N uptake and fruit quality between organically and conventionally grown greenhouse tomatoes | Agronomy for Sustainable Development, Agronomy

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Table III

Concentrations of amino acids, NO₃, , and the ratios of amino acids/ and amino acids/ in the xylem sap of tomato plants grown under five different cropping systems with four tomato cultivars in 2005.

Crop systems	Amino acids (μM)	(μM)	(μM)	Ratio aa/	Ration aa/
Crop systems
ORG	38.91 a	915.27 a	39.84 a	0.04 a	1.43 a
ORGWS	32.53 ab	749.72 a	24.80 a	0.05 a	1.60 a
CONV-S	30.59 b	803.18 a	36.93 a	0.05 a	1.32 a
CONV-RWL	29.60 b	701.70 a	29.98 a	0.04 a	1.01 a
CONV-RWH	27.52 b	750.63 a	38.95 a	0.04 a	1.71 a
P values	0.0501	0.3643	0.3164	0.6791	0.5591
	(0.0070)^a	(0.7250)^a		(0.0050)^a

Cultivars
15	34.74 bc	914.57 a	41.79 A	0.04 b	1.25 a
40	36.50 c	752.18 ab	27.72 A	0.05 a	1.93 a
45	26.01 a	649.66 b	30.58 A	0.04 b	1.51 a
93	29.99 ab	819.19 ab	36.31 A	0.04 b	0.95 a
P values	0.0031	0.0421	0.1229	0.0008	0.0951
	(0.0026)^a	(0.0004)^a		(0.4201)^a

P values for the 2004 analyses.

Crop systems were: organic system in soil with (ORG) or without straw (ORGWS), conventional system in rockwool with a high nutritive solution concentration (CONV-RWH), conventional system in rockwool with a low nutritive solution concentration (CONV-RWL), and conventional system in soil (CONV-S). The interaction between crop systems and cultivars was not significant and therefore, only the main effects were considered. For each parameter (crop systems and cultivars), within each column, values followed by a similar letter are not significantly different according to Tukey test (P ≤ 0.05).