The article considers a retrospective of study of the filtration stability of non-cohesive (sand and gravel) soils carried out by specialists of the Soviet and Russian periods. These are the works of hydraulic scientists: Izbash S.V., Patrashev A.N., Chugaev R.R., Istomina V.S., Pavchich M.P., Pravedny G.H., Lubochkov E.A., Burenkova V.V., Zhilenkov V.N. and others. There is given a detailed description of characteristic features of the operation of filters and drainages of hydraulic structures, earth dams, dikes, other water retaining structures. Numerous approaches to the suffusion processes in sand-gravel soils are generalized. The description of filtration deformations of non-cohesive soils is given: suffusion, colmatation (colmatage), penetration-spillage, erosion and flooding and rebounding. It is shown that in their calculations the authors of dependencies operate such characteristics of soils and filtration as the diameter of particles, gradient and water speed. It is stressed that in modern regulations the allowed natural gradient in a ground construction is determined with a reserve factor, depending on the class of the structure.

The average daily expenditure security curves are used to analyze the intra-annual flow distribution of rivers. The share of basic runoff is estimated using the natural flow regulation coefficient (NFRC). The value of NFRC is determined by the graph of the specified curve or another approximate method. The simple Mathcad-method for calculating NFRC is presented in the article. NFRC of The Pregel River over the past 12 years have been calculated. The presence of floods (summer-autumn rain and winter thaw) is a feature of the hydrological regime of the Southern Baltic rivers. The increase in the water content of the Pregel River is mainly due to floods. Flood flows greater than the runoff of spring floods in some years. Therefore, the increase in the water content of the Pregel River does not lead to a decrease in NFRC, as in other rivers in the North-West of Russia.

Compliance with agronomic regulations in farms that ensure high quality seeds (conducting grade and species weeds on seed crops, compliance with harvesting, part-time, seed storage, etc.) must be constantly monitored in order to improve production on the way to the cultivation of high-quality seed material.

one of the most striking and well-known examples of harmful insect species that are currently classified as overdominant pests is the Colorado potato beetle: Leptinotarsa decemlineata Say. The high efficiency of the insecticide Beretta, MD (60 g/l + 40 g/l + 30 g/l) in the fight against this pest has been shown.

The article is devoted to the use of land resources in Russia. It has been established that the negative trend of reduction of the area of irrigated and drained lands continues, a significant part of the reclaimed lands remains unused, for the development of which funds from budgets of various levels and agricultural organizations were previously spent.