Use shredded wood residuals in forestry
The work on artificial regeneration in Karelia, it takes about 30 million seedlings annually. Coniferous seedlings grown in forest nurseries. Of this number, more than 6 million seedlings were grown with closed root system under greenhouse complexes. Four greenhouse complex of Karelia is currently applied the technology of growing seedlings of softwood with closed root system. This technology in Finland developed. The substrate compositions prepared according to standard technology, except for peat, include dolomite powder and complex fertilizers. Annual demand of greenhouses in peat substrate is about 200 tons. In the future, with the increase in the cultivation of planting material with closed root system, the substrate needs to be increased. In this paper, we propose a new technology of using logging residues to prepare substrates. At this, for the six million seedlings with closed root system costs amount to 420 thousand rubles/year when grown using traditional substrate, 257.6 thousand rubles/year using the proposed substrate; prices change over time, but their ratio remains approximately the same.