Evaluation of the effects of growth stimulants for improving winter hardiness and yield of raspberry

In the article the results of the research studying the effects of ecologically safe growth regulators resistance of raspberry plants to stress factors of the winter period and yield are given. The object of study is the raspberry variety Sputnitca and growth stimulators humisol-H, sodium humate, humate + 7 and energy-liquid. The experience was carried on gray forest medium loamy soil. Before planting the soil had the following characteristics: humus content was 3.9 %; mobile phosphorus content was from 19.9 to 28, exchangeable potassium was from 10.5 to 13.9 (mg/100g soil), рНKCl - 5.6; Нг - 3.6. The scheme of planting of raspberries was 0.5x2.8 m. The experience was held in triplicate. The variants of the experiment were arranged in a rendomized manner. A common type of agrotechnics for berry crops was used. The following mineral fertilizers were used: double superphosphate, potassium sulfate and ammonium nitrate. The fertilizers were applied in a dose of N60P90K90 before the experiment was carried out. The studies have shown the stimulating effect of biological preparations on physiological processes, the growth activity of raspberry plants. As a result, the adaptive potential and productivity of raspberries increased. It is proved that the treatment of plants with humate + 7 and energen with mineral fertilizers led to an increase in winter hardiness of raspberries. The freezing of shoots on these variants was 1.9-2.0 points, the death of the kidneys - 24.0-26.1%. Thanks to the activation of regeneration processes, the general state of plants at the end of the growing season was estimated at 3.8-3.9 points, and it was good. The use of growth promoters did not affect the chlorophyll content in leaves of raspberry in the phase of budding and full maturity. The difference between variants in this indicator is not significant. In all variants of the experiment with plant growth stimulators, a significant increase in the leaves area was noted - by 6.2-9.0%. Four-time treatment with Humate+7 macro- and microelements on the background of complete mineral fertilizer at a dose of N60P90K90 increased the yield by 14.4%.