PROSPECTS FOR THE USE OF A COMBINED SYSTEM OF MINERAL NUTRITION OF APPLE SEEDLINGS IN THE CONDITIONS OF THE SOUTH OF RUSSIA
The article compares several mineral nutrition systems used in the fruit nursery. The soil of the investigated area is grey woodland soil. On the basis of the results of soil analysis, we have found low provision of trace elements to the site. A mineral nutrition system was developed based on the peculiarities of soil and climatic conditions. The seasonal dynamics of the increase in the central escape of apple seedlings showed that the accelerated increase in the central escape of apple seedlings was observed with the combined nutrition system. At the end of the season, surveys were conducted on the distribution of apple tree seedlings grafted onto different stocks by product groups in each experiment, and their biometric indicators were measured. During the experiment, we found that the highest yield of standard seedlings with the best biometric indicators was noted in the variant of the combined system, in which two methods of fertilizing were fertilizing. In addition, it was noted that plants in the variant of the experiment with the use of combined nutrition were less affected by the stress factor of the second half of the summer period