RICE IRRIGATION METHOD Russian patent published in 2024 - IPC A01G22/22 A01G25/00 

FIELD: agriculture.

SUBSTANCE: method consists in using a distribution pipeline, distribution wells, a discharge header, irrigation pipelines combined with drainage and discharge pipelines, water outlet structures combined with discharge structures. A crop rotary distributor, a district discharge, trapezoidal-shaped ridges, a last-order distributor, drainage-moistening drains with diameter of 50 mm and outflow of 10 l/h per 1 running meter are built and closed field sprinklers, to which drainage-moistening drains laid in parallel at distance of 0.7 m from each other and located to them with slope of 0.0003 to depth of 0.05 m are connected perpendicularly. A closed field sprinkler is connected perpendicular to the local discharge and the last-order distributor through distribution wells, which is laid with slope of 0.003 to the local discharge at depth of 1 m and with diameter of 560 mm. On rice paddy fields parallel at distance of 0.4 m from each other there formed are ridges of trapezoidal shape with laying of sides from 1:1 to 1:0.85, width at base of 0.3 m and height of 0.25 m, laid with drying and moistening drains with possibility of coincidence of their axes of symmetry, inter-ridge gaps are covered with filtering geotextile, and a plastic and/or biodegradable mulching film is laid on the ridges. Moistening of the root layer of soil in range of 65% to 100% of the minimum moisture capacity during the vegetation period is carried out by supplying water from the crop rotation distributor to the last order distributor, then to a closed field sprinkler-discharge and to drainage-moistening drains. Drainage of root layer of soil to values not exceeding 65 % of minimum moisture capacity in non-vegetation period is carried out by collection and removal of excess surface and ground water through drainage-moistening drains into closed field sprinkler-discharge, then to the local discharge, then to the group collector. Switching of closed field sprinkler-discharge from drainage function to moistening function is carried out in distribution wells, which are located at the intersection of the closed filed sprinkler-discharge with the last order distributor and the local discharge.

EFFECT: saving of irrigation water, reduction of operational works, improvement of ameliorative state of rice soils and increase of rice yield, by increasing the coefficient of land use, using resource-saving technologies of rice cultivation and creating a favourable water-air mode in the root layer of soil, improvement of ecological safety of rice irrigation systems due to reduction of volumes of contaminants carried out from the rice irrigation system through drainage and discharge waters into the water intake.

1 cl, 4 dwg, 4 tbl