FIELD: agriculture.SUBSTANCE: group of inventions relates to the field of land reclamation and may be used to improve quality of water under trickle irrigation of crops, when watering is done with water of high salt content. The method includes mixing of mineralised and distilled water. Production of irrigating water of required mineralisation is provided with the help of a device that separates irrigating water into two parts. One of the parts remains unchanged, and the other one is demineralised, with their subsequent mixing at the necessary proportion or without mixing, using each one separately. The device for method realisation comprises a body, an evaporating element, a condensate collector and a device for distillate drainage. The body is equipped with a hollow dismountable cover. The upper and lower surfaces of the cover are made as spherical from optically transparent material with different radii of curvature. The cover, when filled with irrigating water, forms a collective concave-convex lens, which focuses solar radiation at a focal plane. The evaporating element is made in the form of a detachable sleeve. Drainage of distillate and control of mineralisation of irrigating water is carried out with pipelines equipped with control devices and communicating with the cover cavity, environment and condensate collector. The collector is made in the form of a ring to form a circular inclined tray between the body and the ring, and this tray collects distillate.EFFECT: invention provides for production of irrigating water with salt composition that minimises negative effect at structure of irrigated lands soil.2 cl, 1 dwgГруппа изобретений относится к области мелиорации земель и может быть использована для повышения качества воды при капельном способе орошения сельскохозяйственных культур, когда поливы осуществляются водой с высоким содержанием солей. Способ включает смешение минерализованной и дистиллированной воды. Получение оросительной воды требуемой минерал
