Methods of potato tuber reproduction in original seeding

The article contains the results of the research (2011-2016) on the identification of the optimal method for obtaining the initial tuber material of potatoes in the conditions of the mountainous and foothill zones of the Republic of North Ossetia-Alania. A comparative evaluation of the variants of various methods for the production of mini-tubers was made. It was proved that the use of the method of planting microplants directly into the soil in the conditions of the phytosanitary mountain zone is not inferior to the traditional methods of accelerated reproduction in a closed ground

Use of biodiversity of the early perfect varieties of potato in brewing

In the conditions of the mountainous zone of the Republic of North Ossetia-Alania more than 120 varieties of potatoes of domestic and foreign breeding were studied for breeding on economic and biological grounds. Adjustments are made to the Parameters of the Early and Middle Ripening Varieties Model for the North Caucasus Region. Estilla and Ehud varieties showed the highest productivity, Estima - more than 35 t / ha, starch content - Predgorny variety (16.73 mg%), Vladikavkazsky variety (16.37 mg%) and Adretta variety (16.31 mg%)

ROLLER BIT DRILLING OPTIMIZATION

Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.The article is devoted to the study of the features of the roller bit drilling process control under the uncertainty caused by a random change in the drilling rock properties. An optimization model is proposed to control the roller bit drilling parameters, using correction values of the axial force and bit rotation speed. A method for optimizing the operating parameters of the roller drilling process is developed, using correction values of the axial force and bit rotation speed, depending on the technical characteristics of the drilling rig and the physical and mechanical properties of the rock. The proposed method allows determining the maximum values of the bit life, drilling speed and their relation, corresponding to the optimal conditions of the roller bit drilling process, which are necessary for optimal control of the parameters of the proces