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To control the processes of ore treatment proposed adapted to the conditions of a closed cycle crushing-screening criterion "output productive class -2 + 10 mm", reflecting the effectiveness of all processes. The dependence of the outputs of the individual classes of ore and the proposed optimization criterion parameters of the grinding process shows their relationship with the energy intensity of the process. It is shown that the increase in the load on the screen causes a decrease in the screening efficiency and an increase in the mass fraction of class +2 mm in the circulating ore. Excessive increase in the width of the discharge gap of the crusher causes an increase in the output of the circulating product and an increase in energy consumption. Reducing the discharge gap of less than 7.5 mm leads to an increase in the output of the class - 2 mm. An improved system and algorithm for optical analysis of ore size was proposed and tested. The sensors for controlling the granulometric composition of ore are located above the conveyors for the transportation of over-and under-mortar products of the screening operation. The optical analysis mode provides for the sequential switching on / off of feeding conveyors and crushers, thereby ensuring the flow of the crushed product into the measurement zone from one crusher. The total duration of the analysis of ore from 6 crushers is 12 minutes, which does not affect the final performance of the device of crushing. The application of the developed algorithm can significantly improve the accuracy of the analysis of the size of crushed ore and reduce the power consumption during the processing of ore.

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The authors note the relevance of potato irrigation in the North-West region of the Russian Federation. The meteorological characteristics of the region are given, the need for irrigation in the first half of the growing season is noted. The objects of research were potato varieties of the mid-early and mid-season groups: Spring Belaya, Lomonosovsky, Charoit, Real, Gusar, Lilac fog, May flower, Peter’s Riddle. The studies were carried out in 2018 - 2019. at the experimental field of the Velikie Luki State Agricultural Academy. The results of the study of the influence of the use of metered irrigation in the first half of the growing season on the increase in the productivity of the improved seed material of potatoes are given. The article presents the results of assessing the productivity of these varieties of potatoes.

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