Annotation

Purpose: to substantiate scientifically a unified model for determining the yield of various agricultural crops when changing water consumption deficit for the arid climate conditions of southern Russia. 

Materials and methods. The field experiment was conducted in 2021–2023 and was based on the study of the water balance structure formation of an irrigated field of various agricultural crops: winter wheat, corn for grain, summer potatoes, onions, sugar beet, soybeans and carrots. 

Results. Data analysis showed that over three years of research with precipitation levels of Pn = 40 % (2021), Pn = 60 % (2022), Pn = 10 % (2023), the yields of the crops under consideration were, respectively: winter wheat – from 4.9 to 6.5 t/ha; corn per grain – from 12.5 to 13.5 t/ha; onions – from 88.5 to 97.3 t/ha; summer potatoes – from 35.2 to 39.3 t/ha; carrots – from 71.9 to 82.1 t/ha; sugar beet – from 43.5 to 48.9 t/ha; soybeans – from 4.1 to 4.6 t/ha. When developing a model for determining yields, two fundamental areas of planning water intake for irrigation should be considered: 1) a deterministic planning model, when water supply in sources is unlimited, there is no shortage of both water and other integral types of resources: 1 – YA/Ymax = KO(1 – ETA/ETmax); 2) a stochastic planning model in the presence of a shortage of both water, as well as other integral types of resources in their mathematical expression: 1 – YA/YS = KO(1 – ETA/ETS). The standard yield is determined taking into account these deficits: YA = min(α0 + α1·ΔWA; YS). 

Conclusions. The use of the model will allow, first of all, to highlight the priority of the appropriate agricultural crop to provide irrigation water, taking into account the optimal reduction in yields of related crops of the developing crop rotation and the actual hydrometeorological situation in the irrigated area under the conditions of water scarcity.

doi: 10.31774/2712-9357-2026-16-2-1-15

For quoting

Olgarenko V. I., Olgarenko I. V., Kolganov A. V., Olgarenko V. Ig. A unified model for determining yields while changing the water consumption deficit of various agricultural crops in the arid zone of southern Russia. Land Reclamation and Hydraulic Engineering. 2026;16(2):1–15. (In Russ.). https://doi.org/10.31774/2712-9357-2026-16-2-1-15.

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