Effect of Organic and Mineral Fertilizers on the Growth of Acer Platanoides L.

A field experiment was carried out with Acer platanoides L. saplings fertilized using organic fertilizer „Sapton" in different variants: control (K); variant 1 (V1) - low dose of “Siapton” (1ml); variant 2 (V2) - high dose of “Siapton” (50ml); variant 3 (V3) - high dose of „Siapton” and mineral fertilizer “Krystalone” and variant 4 (V4) - high dose of “Siapton” and organic fertilizer “Biohumus”. All fertilized variants show better growth in mean diameters (root collar diameter (D0) and breast height diameter (BHD)), average height and wood biomass accumulation with the exception of V1. The dose turns out to be definitive in relation with the fertilization effect. Good results are obtained by combining two organic fertilizers (V4) during the first two years of fertilization. Variant 3 (combination with mineral fertilizer), however, has a longer duration and is manifested in a long time after application of fertilization (especially in the third year after treatment) and is also recommended to be applied in practice. The increment of height is most pronounced in V4 (a combination of two organic fertilizers) for a longer period, too: an increment of 0.43 m versus 0.07 m for the control during the third year. This gives the reason to recommend organic fertilization in improving the growth characteristics of Norway maple for the needs of forestry and urban planning where good growth and accumulation of woody biomass is desired.