THE GROWTH OF SIBERIAN LARCH SEEDLINGS DEPENDING ON THE METHOD OF PRE-SOWING SEED TREATMENT AND THE COMPOSITION OF THE SUBSTRATE
In conditions of a significant increase in the volume of growing planting material with a closed root system, the search for a resource-saving composition of the substrate becomes more and more urgent. Since the riding peat currently used is available for harvesting extremely on a limited territory of Russia. We considered the following experimental compositions of the substrate: a mixture of 10 % clay, 40 % sawdust and 50 % peat (T + G + O); hydrodynamically activated coniferous wood (enriched wood) (Od). Two types of pre-sowing treatment of Siberian larch seeds with a three-year shelf life were also used in the experiment: soaking in water and in a 0.2 % solution of succinic acid. Observations have shown that succinic acid solution has a positive effect on soil germination and germination energy when seeding into peat. Observation of the growth of seedlings showed that the use of hydrodynamically activated coniferous wood, combined with the treatment of seeds with succinic acid, had a stimulating effect. The height of seedlings in this experimental version exceeded the control (sowing seeds soaked in water in pure peat) by 7.0 %, and the other substrate by 12.8 %.