EVALUATION OF SILVAMIX® FERTILIZER EFFECT ON SPRUCE SEEDLINGS (Picea abies (L.) Karst.) IN CULTIVATION OF FORESTS IN THE WESTERN SUDETEN - SZKLARSKA PORĘBA (1993 - 1994)
Research conducted by the Department of Soil Science and Fertilization at the Forestry Research Institute in Warsaw.
SILVAMIX® of a composition of N - 10.3, P2O5 - 16.2, K2O - 6.2, MgO - 5.0 was applied in the spring of 1993 in a quantity of 4 tablets per spruce seedling:
- two-years (test plot 1 - Szklarska Poręba, Zagórze)
- three-years (test plot 2 - Szklarska Poręba, Zagórze)
The positive effect of SILVAMIX® is shown below:
Year?s growth in height - in cm and%
| Test plot | Year | Control (cm) | SILVAMIX? (cm) | Growth as against control (%) |
|---|---|---|---|---|
| 1 | 1993 | 6.2 | 8.5 | 37.1 |
| 1994 | 6.8 | 8.8 | 29.4 | |
| 2 | 1993 | 7.3 | 10.0 | 37.0 |
| 1994 | 7.9 | 9.7 | 22.8 |
The contents of nutrients in spruce needles - in% 2 years following fertilizing - 1994
| Test plot | Age of needles in years |
N | P | K | Mg | Ca | S |
|---|---|---|---|---|---|---|---|
| 1 | 1 | 1.39 | 0.17 | 0.43 | 0.09 | 0.13 | 0.093 |
| Control | 2 | 1.23 | 0.12 | 0.40 | 0.07 | 0.25 | 0.090 |
| 1 | 1 | 1.68 | 0.23 | 0.51 | 0.12 | 0.24 | 0.086 |
| SILVAMIX® | 1 | 1.41 | 0.20 | 0.48 | 0.10 | 0.46 | 0.081 |
| 2 | 1 | 1.45 | 0.19 | 0.49 | 0.10 | 0.14 | 0.091 |
| Control | 2 | 1.24 | 0.14 | 0.45 | 0.08 | 0.27 | 0.087 |
| 2 | 1 | 1.75 | 0.25 | 0.53 | 0.13 | 0.25 | 0.085 |
| SILVAMIX® | 2 | 1.40 | 0.20 | 0.50 | 0.10 | 0.50 | 0.078 |
As is clear from table 1 the spruce seedlings on these plots reacted with a 37% increase in the year?s growth in height - 1 year after fertilizing with SILVAMIX® (on both test plots) as against the control (unfertilized) and with an almost 30% increase in the year?s growth in the second year following fertilizing on plot 1 and almost 23% on plot 2.
The results of analysis of the nutrient contents of the spruce needles (N, P, K, Mg, Ca) given in table 2 (analysis performed 2 years following fertilizing with SILVAMIX®) show their higher intake following fertilizing as against the control (unfertilized) and testify to the favourable nourishment of the seedlings following fertilizing with SILVAMIX®. At the same time a minimal reduction in the intake of sulphur can be seen in the seedlings on the fertilized plots.
Sękocin, 9.4.1996
For the attention of:
Director General
Lasów Panstwowych (State Forests)
Wydzial Zagospodarowania Lasu
00-92 Warsaw, ul. Wawelska 52/54
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