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

FIELD: agriculture.

SUBSTANCE: method consists of using a distribution pipeline, distribution wells, a discharge collector, irrigation pipelines combined with drainage and discharge pipelines, water outlet structures combined with discharge structures. A crop rotation distributor, a local discharge, a last-order distributor, drainage-moistening drains with a diameter of 50 mm and an outflow of 10 l/h per 1 linear meter and closed field irrigation discharges are built, to which drainage and humidification drains are connected perpendicularly, laid in parallel at a distance of 0.7 m from each other and located with a slope of 0.0003 to a depth of 0.05 m. Perpendicular to the local discharge and the last-order distributor, a closed field irrigation-discharge is connected through distribution wells, which is laid with a slope of 0.003 to the local discharge to a depth of 1 m and with a diameter of 560 mm. The root-inhabited soil layer in the range from 65% to 100% of the minimum moisture capacity during the growing season is moistened by supplying water from the crop rotation distributor to the last-order distributor, then to the closed field irrigation discharge and to the moistening drains. The root-inhabited soil layer is dried to values not exceeding 65% of the minimum moisture capacity during the non-growing season by collecting and removing excess surface and ground water through moistening drains into a closed field irrigation discharge, then into a local discharge, then into a group collector. The closed field irrigation discharge is switched from a drainage function to a humidifying one in distribution wells, which are located at the intersection of a closed field irrigation discharge with a last-order distributor and a local discharge.

EFFECT: saving irrigation water, reducing operational work, improving the reclamation state of rice soils and increasing rice yield by increasing the coefficient of land use, using resource-saving technologies for rice cultivation and creating a favourable water-air conditions in the root layer of the soil, increasing the environmental safety of rice irrigation systems through reducing volumes of pollutants removed from the rice irrigation system through drainage and discharge waters into the receiving water.

1 cl, 4 dwg, 4 tbl