Dipl.-Ing. Lubomír KUBELKA, Ph.D., Dipl.-Ing. Jaroslav KUBÍČEK, Ph.D.,
Dipl.-Ing. Jiří SOUKUP, Ph.D., and Dipl.-Ing. Josef ČAPEK
STATE FORESTS, N.E., Directorate in Teplice;
RESEARCH INSTITUTE OF INORGANIC CHEMISTRY, Usti nad Labem;
RESEARCH INSTITUTE OF ORNAMENTAL GARDENING, Pruhonice by Prague;
MUNICIPAL FORESTS OF THE TOWN OF JACHYMOV, Jachymov; (Czech Republic)
1. The tabletted SILVAMIX®fertilizers
The tabletted SILVAMIX® fertilizers allow the spot application which, when carried out properly, guarantees a considerably better utilization of the supplied nutrients compared to other complex fertilizers applied broadly. The release of the nutrients from SILVAMIX® into the soil continues for a period of up to 18 months depending on the local climatic and pedological conditions. SILVAMIX® can be successfully applied into free soil to newly established cultures (e.g., to 1-4 years old forest trees) and to seedlings in nurseries or in flower pots.
2. The application of the tabletted SILVAMIX® fertilizers into free soil
The number of the SILVAMIX® tablets (10-15 g each) applied to each seedling is 4-5 (Fig. 1). The distance of the tablets from the seedling stem corresponds to the perimeter of the seedling top projection onto the soil surface. The tablets should not be placed closer than 15 cm from the seedling stem. The distance should not exceed the perimeter of the seedling top projection by more than 10 cm. Depending on the local climatic, soil and technical conditions, the SILVAMIX® tablets are either placed below the soil surface at the depth of the side roots at the edge of the planting hole, about 15 cm from the seedling stem (Fig. 2), or they are put directly onto the soil surface. The tablets can alternatively be worked in closely below the soil surface by stepping on them (Fig. 3). Root level application partially prevents undesirable co-fertilization of weed.
3. The application of the tabletted SILVAMIXÂ®fertilizers in flower pots
Plantation fertilization: The tablets are to be laid on a layer of soil under the root bundle (Fig. 4). If more tablets are applied, they are placed evenly around the girth of the root system. Recommended application - one tablet (5-10 g each) per 1 liter of soil.
Supplemental fertilization: The tablets are to be placed evenly either onto the soil surface or just below the surface at the distance of 5-10 cm from the plant stem (Fig. 5). Recommended application - one tablet (5-10 g each) per 1 liter of soil.
4. The application of the powdered SILVAMIX® fertilizers into free soil
The powdered SILVAMIX® fertilizers are applied by powdering 200-400 g onto each square meter of the soil surface or, alternatively, they are placed just below the surface. Repeated application with a half portion (100-200 g/m2) is recommended in the following year. For the production of forest or garden substrates, at least 3 kg of the powdered fertilizer should be mixed with 1 m3 of peat and/or mould.
The application of the powdered SILVAMIX® fertilizers is very popular in forest seedling fertilization in nurseries.
5. The period of application
The tabletted or powdered SILVAMIX® fertilizers are applied during the spring and summer seasons until the end of July. The fertilizers are successfully applied to the seedlings during the spring time in the year of plantation or in the following year. Depending on the local conditions, the fertilizers are applied at the latest in the fall (September or October).
The application of the SILVAMIX® fertilizers onto snow is functionally inappropriate.