Modern methods of intensification of growing of planting material Catalpa bignonioides Walter

Intensification of landscape gardening in settlements determines the widespread use of introduced woody plants to create landscape compositions for various functional purposes. Catalpa bignonioides Walt is increasingly appearing in park areas and alley plantings in Kharkiv. Thus, the issue of production intensification of Catalpa bignonioides planting material requires a detailed study, and such research is important both scientifically and practically. The purpose of the presented article is to determine the feasibility of using modern complex mineral fertilizers in the cultivation of catalpa bignonioides planting material in an ornamental nursery. An active experiment was carried out by means of visual observation, assessment of plants appearance in terms of their growth and development in the process of applying different types of mineral fertilizers, as well as measurement and recording of the obtained results of field data. When comparing the effectiveness of complex fertilizers, it can be concluded that their use has a significant positive effect on plants. The use of complex mineral fertilizers selected in the experiment allows to obtain high-quality C. bignonioides planting material with a high survival rate. Studies have shown that the use of mineral fertilizers has a significant impact on the growth and development of seedlings. The most effective fertilizer was DuraSOP, a complex granular mineral fertilizer with trace elements. Double application of this fertilizer leads to a significant increase in seedling height by an average of 41.7 %, root collar diameter by 78 %, and crop height growth by 72 %. The crown projection area of four-year-old seedlings of Catalpa begnonioides in the variant with the use of DuraSOP fertilizer, exceeded the control values by 132.7 %. This indicates that the use of complex granular mineral fertilizer with microelements DuraSOP in the production of planting material is promising. Key words: complex mineral fertilizers, seedlings, crown projection area, condition index, biometric parameters.