Effect
Increased produce quality
Root Grow WP treated English Oak, cv. Fastigiata, had on average (measurements same year and year later) a 0.6 % bigger trunk diameter, 17.2 % more shoot growth, 14 % more dry weight, a 2.5 % lower dry:fresh mass ratio, 6.3 % less specific leaf weight, a 21.3 % bigger leaf area, a 15.2 % higher WUE, 9.8 % more chlorophyll 90 days after budbreak, 8.3 % more chlorophyll 135 days after budbreak, leafs contained 10.3 % more N%, 5.4 % more P%, 12.2 % more K%, 7 % less Mg% and 5 % more Fe compared to the untreated control.
Trial details
outdoor, unprotected, soil (clayey) grown + 80 L peat moss, planting before budbreak, no fertilisation during trial
Italy
Crop
Oak, Quercus robur
Trial application
Method
Soil drench
Timing
First application at planting, followed by 5 treatments with a monthly interval
Rate
5 g diluted in 5 L water; 25 g/plant/year
2002
Response of english oak (Quercus robur L.) trees to biostimlants application in the urban environment
Journal of Arboriculture
28(2)
70-75
Crop group
