Response of English Oak (Quercus Robur L.) Trees to Biostimulants Application in The Urban Environment

F. Ferrini; F.P. Nicese

doi:10.48044/joa.2002.28.2.70

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Table 1.
Influence of the biostimulants on trunk diameter and shoot growth of Quercus robur ‘Fastigiata’ trees.
Treatment Diameter (cm)
1999 Diameter (cm)
2000 Shoot growth (cm)
1999 Shoot growth (cm)
2000
Mycobacter 9.295 9.90 8.32 9.59
Root Grow 8.783 9.76 7.99 8.89
Control 9.110 9.32 6.54 7.93
p-value 0.269 0.265 0.089 0.112

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Table 2.

Influence of the biostimulants on leaf dry weight, dry/fresh weight, leaf area, SLW (specific leaf weight, leaf dry weight/leaf area) of Quercus robur ‘Fastigiata’ trees in 1999 and 2000. Sampling date: 135 days after budbreak.

Treatment	1999				2000
Treatment	Dry weight (g)	Dry/fresh weight ratio	SLW (mg/cm²)	Leaf area (cm²)	Dry weight (g)	Dry/fresh weight ratio	SLW (mg/cm²)	Leaf area (cm²)
Mycobacter	138	0.464	6.69	20.62 ab^*	203 a	0.456	5.30	38.31 a
Root Grow	130	0.478	6.04	21.51 a	201 a	0.455	5.03	39.96 a
Control	130	0.496	7.14	18.22 b	157 b	0.461	4.89	32.09 b
p-value	0.860	0.481	0.228	0.015	0.042	0.784	0.58	0.000

↵* Means with different letters are significantly different at p ≤ 0.05.

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Table 3.

Influence of the biostimulants on net photosynthesis (Pn) (pmol CO₂ * m^-2 * s^-1), evaporation rate (E) (mmol H₂O * m^-2 * s^-1), WUE (water-use efficiency: Pn/E) of Quercus robur ‘Fastigiata’ trees. Average of four sampling dates in 1999 and 2000.

Treatment	1999			2000
Treatment	Pn	E	WUE	Pn	E	WUE
Mycobacter	12.31 a^*	2.15 a	5.73 a	12.44 a	2.67	4.66 ab
Root Grow	12.06 a	2.13 a	5.66 a	13.54 a	2.71	5.00 a
Control	9.06 b	1.83 b	4.94 b	11.09 b	2.57	4.32 b
p-value	0.000	0.004	0.002	0.014	0.795	0.041

↵* Means with different letters are significantly different at p < 0.05.

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Table 4.

Chlorophyll content (p g * g^-1) of Quercus robur ‘Fastigiata’ leaves 90 and 135 day after budbreak (ABB) as affected by commercial biostimulants.

	1999		2000
	Chlorophyll 90 ABB	Chlorophyll 135 ABB	Chlorophyll 90 ABB	Chlorophyll 135 ABB
Mycobacter	13.85 a^*	17.71	14.99 a	16.09
Root Grow	13.83 a	17.73	14.25 a	16.57
Control	12.66 b	16.45	12.90 b	15.25
p-value	0.000	0.097	0.000	0.150

↵* Means with different letters are significantly different at p ≤ 0.05 (year 2).

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Table 5.
Leaf mineral content as affected by commercial biostimulants.
Treatment N % P % K % Mg % Fe ppm
Mycobacter 2.35 a^* 0.137 0.86 0.317 256.3
Root Grow 2.25 a 0.137 0.92 0.267 223.3
Control 2.04 b 0.130 0.82 0.287 212.7
p-value 0.038 0.216 0.452 0.096 0.499
↵* Means with different letters are significantly different at p ≤ 0.05.