Technologies and equipment for scouring silting in linear hydro-technical constructions by the hydrodynamic method are presented. The approbation was carried out and the most effective methods of work were developed. The approximate time norms for performing technological operations using the developed equipment are given.

Tower spillways are widely used in the low-pressure and medium-pressure waterworks. Their hydraulic calculation is to determine their capacity and conjugation water steps. Conjugation water steps calculations for tower spillways as well as research data showed that existing recommendations for determination of compressed depth gave significant errors in finding the length of the apron on spillway. Analysis of laboratory test results have identified functional dependence of compressed depth on the pipe diameter and the headwater and tailwater depth, and get an empirical relationship. Usage of it within the specified boundary condition can determine the quantity of compressed depth and obtain reliable fixing parameters in the tailwater at the tower spillway.

The aim of the work was to generalize the results of industrial research on the improvement of methods for drying loess-and-sink lands under the atmospheric water supply type. To summarize, at this stage it is recommended the following drying methods, most suitable for technical and economic factors. Firstly, it’s backfilling of closed depressions with the device through the saddle of the drainage gullies without additional measures. Secondly, it’s the organization of ecological niches by accumulation of surface runoff in water reservoirs with simultaneous backfilling of adjacent valleys and the use of one digging in an area of at least 10 hectares in the absence of drainage.
The designs of the structures arranged on the drainage network for the removal of surface waters are proposed.

The characteristic of the layer-by-layer precipitation of the drained peat deposit is the compression ratio (compaction). An indicator of the compaction of peat deposits is the bulk density. It is established that further (after 56 years) compaction of the drained peat deposit with a capacity of 150–200 cm will mainly occur in the residual upper layers with initial depths of 0.5 and 1.0 m. The methods for determining the predicted values of the bulk mass in these compacted layers of the peat deposit using its value at the beginning of the calculation period and the value of the compression ratio at the end of this period are proposed. The application of the proposed methods allows to determine the index of compaction of the upper layers of the drained peat deposit (bulk mass) with an accuracy not exceeding an average of 0.021 g/cm3. Calculations on the dependences obtained as a result of the studies show that the transition of the upper half-meter layer of the drained peat deposit to the zone of post-peat soils (volume mass 0.6 g/cm3) will occur in 79–83 years after drainage, and the upper meter – in 159–173 years at the initial (before drainage) power of the peat deposit 150–200 cm.

The article presents the results of a two-year experience in the cultivation of Silphium perfoliatum L. on different soil types, most typical for Brest region. Experimental sites are located on the territory of agricultural enterprises of Zhabinkovsky (Zhabinkovsky district) and Sporovo (Berezovsky district) in Brest region. The studies were conducted within the framework of the project of the innovation fund of the Brest Regional Executive Committee “Implementation of a new forage crop of Silphium perfoliatum L. in agricultural enterprises of Brest region.

The article carried out a spatio-temporal analysis of variability of crop yields and crop-forming factors, using a developed automated system based on GIS and DB, which collected data from the results of long-term monitoring observations at hydrometeorological stations of Hydromet, grades of plants testing stations of the state crop testing system and stations of the Institute for crop yields and agrometeorological crop-forming factors. As a result of the analysis, the variability of yield values and agrometeo-factors based on the construction of probability curves, variability in the context of many years based on the visualization of trends using the moving average algorithm, the calculation of various statistical characteristics of different levels of generalization in time and zoning on the territory of Belarus were studied.

It has been established that prolonged irrigation by livestock wastewater with norms equivalent to 200– 400 kg/ha of nitrogen does not significantly affect the phytotoxicity of sod-podzolic sandy loam soils for the representatives of the families Pоaceae, Fabaceae and Brassicaceae, however, it increases the content of acid-soluble copper in the soil by 0.13, 0.74 and 0.75 mg/kg, respectively, compared to the reference soil. According to the resistance to prolonged irrigation with manure-containing wastewater, the representatives of the families Pоaceeae, Fabaceae and Brassicaceae are arranged in such a decreasing order: radish olive> peas > winter rye > oats> spring rape > spring barley.

The influence of recycling pig-breeding wastes on the contents of heavy metals in the different types of soils is examined. The maximum permissible concentrations (MPC) and approximate permissible concentrations (APC) of these metals are given. It is concluded that the content of the mobility of the compounds depends on the reagents used in their determination. Along with heavy metals, in the vicinity of livestock-breeding complexes it is necessary to determine the COD (chemical oxygen demand), as well as the concentration of ammonium and nitrates in groundwater.

The article discusses the main approaches to automate the management of the water regime of irrigated crops. The analysis of computer programs for the automated calculation of the parameters of irrigation regimes on the basis of retrospective data and the results of monitoring the climatic parameters of irrigated areas has been carried out. The description of the developed decision support system for the operational management of the water regime of crops under drip irrigation is given.

Improving the quality of irrigation requires improvement of irrigation technology to ensure rational use of water and energy, maximum adaptation to the region. Based on the analysis of the existing technology of irrigation with electrified circular sprinkling machines, technological methods are proposed. They are to be adjusted irrigation norms depending on the availability of soil moisture during irrigation of machines with reverse. Using the results of research, it is possible to provide increase in the rate of irrigation to runoff, water conservation and the most gentle irrigation regime.