Scientific Journal of KubSAU

Hydraulic design of water outlets installed (mounted) on water application pipelines of low-pressure small-jet irrigation network when growing gerbera flowers under the conditions of protected ground is given in the paper. Relationships for estimating coefficients of hydraulic resistance and discharge coefficients for different nozzles are deduced

In this article the scheme of landing of early tomatoes and cucumbers in the climatic conditions of the Rostov region is described; we have also calculated the dose of fertilizers for jet system of mixture at a fertigation irrigation. The conclusion is drawn with a possibility of cultivation crop rotation of tomatoes and cucumbers in not heated greenhouses with application of fertilizers

The article describes a circular two-surface threecomponent jet agitator (pump). The calculation method of critical precavitation speeds and in-flows of livestock wastes and mineral fertilizes was introduced

The analysis of the developed types of local system of an irrigation is presented in this article with simultaneous input of nutrients. On the basis of an experimental material it is noted that development of the technological process is necessary for the solution of this problem, allowing to provide sufficient input of nutrients, at cultivation of vegetable and fruit crops. Installation for mixture of fertilizers and water according to the patent 2448450 is considered

The calculation of pumping equipment and piping network parameters is presented. The method of cutting impeller pump diameter for optimal performance of pump unit with piping system on efficiency value is shown. The case of operating the distribution network and pumping station with three pump units D1250-25 is considered. Procedure of construction of loss-of-head curves in pipes, determination of the actual operating parameters of a single pump unit, selection of pump impeller diameter for essentials is indicated. Four points for graphing such curves are presented. According to the first point the whole network is divided into sections with suction, pressure main pipelines and pipelines with changing water flow compared with the previous ones. The second point involves definition of the electrical resistivity of each site. The resistance of network analyzer is determined in the third point, the loss-of -head of the whole network is determined in the fourth point. The article presents the scheme of pumping station with three pump units connected in parallel and a distribution network (Figure1), loss-of-head curves in pipes regardless the number of working pumps (Figure 2), the order of constructing three loss-of-head curves with operating one, two and three pumps with normal and cut pump impeller diameter (Figure 3 ), the order of determination of the actual parameters of pump work characteristics according to combined characteristics of normal and cut pump impeller diameter ( Figure 4) In conclusion, it is stated that the question of proper definition of actual parameters of pumps and the support of these parameters in optimal mode remains open due to the lack of proper methods of constructing loss-of-head curves pipeline. Every similar calculation is preliminary and should be carried out in field conditions