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The influence of five commercially available biostimulant products (Trade names; Generate, Resistim, Fulcrum CRV, Bioplex, Maxicrop) in combination with a water-retaining polymer applied to the root system of silver birch (Betula pendula Roth.) and rowan (Sorbus aucuparia L.) during the winter period under field conditions was investigated. The short and long-term efficacy of biostimulants on growth was quantified by assessing root and shoot vigor and survival rates at week 8 and 20 post bud break. Improvements in tree vitality were also assessed by measurement of leaf photosynthetic rates, chlorophyll fluorescence emissions and chlorophyll content. Significant effects of species, biostimulant and concentration were found on the majority of growth and tree vitality parameters measured. Only two of the biostimulants tested induced significant growth responses in both tree species. Regardless of species, applications of a water retaining polymer alone had no significant effect on tree survival rate...

Influence of Biostimulants and Water-Retaining Polymer Root Dips on Survival and Growth of Newly Transplanted Bare-Rooted Silver Birch and Rowan