Effect
Increased produce quality
Generate treated Red oak grown in usual conditions had on average a 35.3 % larger girth, 32.4 % more leaf dry weight, 48.9 % more shoot dry weight, 28 % longer roots, 57.1 % more root dry weight, a 50.5 % bigger root area and 49.8 % more chlorophyll compared to the untreated control. (Numbers are averages of different doses, application methods and harvest moments (8 and 20 weeks after treatment); differences not always significant)
Trial details
outdoor, unprotected, general tree compost in 5 L pots, no NPK fertilisers during trial
Scotland
Crop
Oak, Quercus robur
Trial application
Method
Foliar spray or root drench
Timing
Post transplanting when trees were in full leaf
Rate
7.5 or 12.5 mL/L water
2003
The influence of biostimulants on growth and vitality of tree urban tree species following transplanting
Arboricultural Journal
27
43-57
Crop group
