Water resources management in the rice irrigation systems in Kazakhstan as well as water conservation and its efficient use are associated with technological processes control factors such as irrigation efficiency, layout of rice bays and their terracing. Managing technological processes in rice systems is complex, since there are significant deviations in the technological parameters of rice systems from the optimal. Therefore, in order to properly manage these processes, it is necessary to know the impact, its direction, assess the results of these impacts and develop an appropriate scientific and information base. The paper considers the impact of rice bays layout quality and terrace on the water-salt regime of soils, rice productivity and irrigation rate. Also, it proposes improvements to parameters of rice systems, water conservation, environmental situation in areas of rice cultivation and water resources management in rice systems.
Research work on the radical improvement of pastures with the sowing of prostrate rods (Kochia prostrate) against the background of plowing the soil to the depth of 20-22 cm has been carried out in the CIS countries since 1936 to this day. Despite the long-term study, in modern conditions, there are no industrial sowing of prostrate rods in Kazakhstan. The repeated attempts to introduce rods into production have failed. The long-term experiments (more than 50 years) have shown that Kochia prostrate does not sprout every year (approximately, two years out of five years, and then in places and sporadically). In one place full-fledged seedlings are provided, and in another place they are absent. That is, tillage does not provide the required efficiency. In this review, on the basis of original studies, the development of soil conditions for the growth of Kochia prostrate during soil cultivation is detailed. As known, when plowing, the upper fertile soil horizon is thrown down and it is buried by the less fertile, more structureless soil of the lower horizons. This, firstly, leads to the development of a hard crust impenetrable by Kochia prostrate sprouts and, secondly, when dry, solid soil blocks are formed under the seeds, impermeable by hypocatilny roots of Kochia prostrate. Therefore, sprouts of either die during dump plowing, or full-fledged shoots are not formed on it. The current dead-end situation with soil cultivation can be corrected by developing a new theoretical concept and, on its basis, developing a technology for soil cultivation and Kochia prostrate cultivation.
A system of agriculture is being developed to accumulate and preserve moisture in soil strips (5-10 cm wide, 5 cm deep, repeated every 50-55 cm in virgin soil untouched by vegetation), treated by surface raking of the loose seedbed layer to form a solid compacted bed, where an ideal condition for seed germination is created. With a favorable combination of weather and climatic conditions, this variant provides an optimal fullness of seedlings and a fairly high fruit-bearing weight of 3.9 t/ha on average for four years, including 4,8 tons in 2019. However, in extraordinary 2019-2020 crop year with extremely low precipitation (2,7 times lower than average annual norms), with the warm winter and spring (100 more than the average annual norm), incredibly intense droughts and dust storms (average of 18-19 days a month vs 4-5 mean annual norm) wind erosion dominated and dictated terms everywhere: furrows, sown with seeds of Summer Cypress were completely covered with drifts of dust with a thickness of 2-3 cm, under which the seedlings could not break through to the surface of the soil and died. In the cultivar keeping nursery, where seeds were sown directly without tillage and 15 PCs/m2 of seedlings were obtained only in the dust-inspired areas that make up one third of the area (400 m2).
Akdala rice irrigation system is located on a high above-floodplain terrace of the Ili river basin, the geological structure of the top layer of soil is represented by 50 varieties that affect the rate of water consumption and rice yield. The soils are alluvial-meadow and takyr, the lithological composition of the aeration zone soils is characterized by a wide variety, differing in mechanical composition, water-physical properties and the degree of salinity. Water filtration on sandy loam, light loam, loam with layers of sandy loam rice paddies during rice irrigation constitutes 12-17 mm/day, which provides water renewal in rice paddies and removal of salts from the root layer of the soil. Rice is grown without flow and discharge of water from rice paddies, the rice yield is 6,8 t/ha and higher. Water filtration on heavy loam, loam with layers of clay soils rice paddies during rice irrigation constitutes 5-3 mm/day. On these soils, due to the convective diffusion of salts from the soil and from ground water, the salinity of water on rice paddies increases and reaches the critical threshold of toxicity of 2,5 g/l. To reduce the salinity of water in the paddies, water is discharged, with subsequent flooding from the irrigation channel, the rice yield is 4,8 t/ha. The rice paddies water balance of the incoming and outgoing is stable. In the aeration zone during the irrigation period desalination occurs in salt balance; in autumn-winter period salts from the lower horizons are redistributed to the upper ones. Rice cultivation, taking into account the geological structure and lithological composition of soils in the aeration zone, provides a profit per hectare of 86,988 tg/ha, the profitability ratio is 25,5%.
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