Determination of the main parameters of the mole irrigation network in the Lower Volga region

The article presents the results of studies to determine the main parameters of the irrigation network for the mole irrigation system on light chestnut soils of the Volgograd region, a typical region of the Lower Volga region. This method of irrigating crops will be used for the first time in this region. For this, 3 variants of the depth (0.3; 0.4 and 0.5 m) of the location of mole sprinklers - soil pipes with a diameter of 58 ... 63 mm for supplying water to plants were studied. Based on the study of moisture contours, it was found that the most effective was the location of molehills at a depth of 0.3 ... 0.4 m, since 99.3 ... 95.1% of the moisture in the zone of normal moistening (90…110% SMC the next day after watering) was within the active soil layer of 0.0-0.8 m in the absence of deep filtration into the underlying layers. Further study of the moisture contours showed that at a mole irrigation depth of 0.3…0.5 m, the zone of normal moisture (90…110% SMC) extended 40…51 cm to the left and 42…45 cm to the right, and the zone of low moisture (75 ...90% SMC) - 69...91 cm to the left and 63...68 cm to the right of the molehill axis, which allows soil sprinklers to be located at a distance of 1.0...1.5 m from each other if it is necessary to uniformly moisten the active soil layer throughout the irrigation area. The study was supported by a grant from the Russian Science Foundation and the Administration of the Volgograd Region under project No. 22-26-20070, https://rscf.ru/project/22-26-20070

Methods for forming an irrigation network for a mole subsurface irrigation system

The article presents the results of field studies carried out in 2022 on light chestnut soils of the Lower Volga region, which were aimed at studying the methods of forming soil pipes for the mole irrigation system using various designs of the mole tine (a special working body for cutting molehills) and the speed of the tractor during the formation of the irrigation network. The considered method of irrigation in the soil and climatic conditions of this region has not been previously studied. As a result, it was found that the use of a trapezoidal stand with a “knife” (a front cutting edge 30 mm wide along the entire height of the stand) and a “chisel” (a rectangular cutting surface of the drainer) was the most effective for arranging an irrigation network of mole irrigators (molehills), since here, regardless of the shape and size of the expanders, the degree of their shedding was 5–38% lower than in the variants with a rectangular post with an ellipsoid shape of the cutting surface of the drainer. Also, our studies showed that when the tractor was moving at 0.9 ... 2.6 km / h, the degree of destruction of molehills was 42 ... 87%, and at 3.4 ... 4.3 km / h this figure decreased to 13 ... 18%, therefore, this speed allowed more efficient formation of soil pipes for the creation of mole subsoil irrigation systems. The study was supported by a grant from the Russian Science Foundation and the Administration of the Volgograd Region under project No. 22-26-20070, https://rscf.ru/project/22-26-20070

Determination of the main parameters of the mole irrigation network in the Lower Volga region

The article presents the results of studies to determine the main parameters of the irrigation network for the mole irrigation system on light chestnut soils of the Volgograd region, a typical region of the Lower Volga region. This method of irrigating crops will be used for the first time in this region. For this, 3 variants of the depth (0.3; 0.4 and 0.5 m) of the location of mole sprinklers - soil pipes with a diameter of 58 ... 63 mm for supplying water to plants were studied. Based on the study of moisture contours, it was found that the most effective was the location of molehills at a depth of 0.3 ... 0.4 m, since 99.3 ... 95.1% of the moisture in the zone of normal moistening (90…110% SMC the next day after watering) was within the active soil layer of 0.0-0.8 m in the absence of deep filtration into the underlying layers. Further study of the moisture contours showed that at a mole irrigation depth of 0.3…0.5 m, the zone of normal moisture (90…110% SMC) extended 40…51 cm to the left and 42…45 cm to the right, and the zone of low moisture (75 ...90% SMC) - 69...91 cm to the left and 63...68 cm to the right of the molehill axis, which allows soil sprinklers to be located at a distance of 1.0...1.5 m from each other if it is necessary to uniformly moisten the active soil layer throughout the irrigation area. The study was supported by a grant from the Russian Science Foundation and the Administration of the Volgograd Region under project No. 22-26-20070, https://rscf.ru/project/22-26-2007

Methods for forming an irrigation network for a mole subsurface irrigation system

The article presents the results of field studies carried out in 2022 on light chestnut soils of the Lower Volga region, which were aimed at studying the methods of forming soil pipes for the mole irrigation system using various designs of the mole tine (a special working body for cutting molehills) and the speed of the tractor during the formation of the irrigation network. The considered method of irrigation in the soil and climatic conditions of this region has not been previously studied. As a result, it was found that the use of a trapezoidal stand with a “knife” (a front cutting edge 30 mm wide along the entire height of the stand) and a “chisel” (a rectangular cutting surface of the drainer) was the most effective for arranging an irrigation network of mole irrigators (molehills), since here, regardless of the shape and size of the expanders, the degree of their shedding was 5–38% lower than in the variants with a rectangular post with an ellipsoid shape of the cutting surface of the drainer. Also, our studies showed that when the tractor was moving at 0.9 ... 2.6 km / h, the degree of destruction of molehills was 42 ... 87%, and at 3.4 ... 4.3 km / h this figure decreased to 13 ... 18%, therefore, this speed allowed more efficient formation of soil pipes for the creation of mole subsoil irrigation systems. The study was supported by a grant from the Russian Science Foundation and the Administration of the Volgograd Region under project No. 22-26-20070, https://rscf.ru/project/22-26-20070