Тhe effect of the preparation «Biostim» on the growth and development of seeds and seedlings of woody species in the arid zone

breeding in the Volgograd region. The objects of research were the woody species Quercusrobur L., Robiniapseudoacacia L., PopulusbolleanaLouche., Populusnigra var. italica Münchh., Catalpa bignonioides, Pinusnigra subsp. pallasiana (Lamb.), Platycladusorientalis (L.) Franco., Piceapungens Engelm. ofdifferentgeographicalorigin. As a result  of the conducted studies, the best result  was  shown  by poplars  and  catalpa  with  a concentration of «Biostim»  at a dose of 2.5 l/ha (20 ml) for cuttings and 20 ml/l for seeds. The concentration of the preparation at a dose of 10 ml / kg (the consumption of the working solution is 1.5-2 l/kg) with soaking of seeds before sowing for 10-20 minutes, followed by drying, was suitable for Robiniapseudoacacia. The concentration of the preparation in a dose of 10 ml / l with soaking of the seeds before sowing  for 10-20 minutes followed  by drying was  suitable for robiniapseudoactation. The worst result  in the test of laboratory germination of seeds was shown  by oak petiolate,  due to the lack of reaction of seeds to processing  and their mold  formation. In coniferous  species, the best result  was shown by Crimean pine with a concentration of the preparation«Biostim» of 10 ml / l and 2.5 l / ha. The germination of spruce  and  thuja seeds  was  weak.  According  to the  results  of the  test  of the  preparation «Biostim» on seedlings and seeds in a nursery on dark  chestnut soils, the best result  was shown  by seedlings of poplar and catalpa  species with  a concentration of «Biostim» at a dose of 2.5 l/ha and 20 ml/l for seeds. Additional top dressing with poplar preparation proved to be effective, after which good growth, development and leafing of plants were observed. Seedlings and seeds of eastern thuja and blue spruce after additional processing grew and developed satisfactorily, subsequently their drying and loss was observed, which makes the topic of testing biostimulators of growth on conifers is promising for further research.

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