Aspects of optimization of factors affecting rice productivity in the Krasnodar Territory

 The standard technology of irrigation of rice paddies by flooding is the most water-intensive. The economic efficiency of land reclamation projects can be calculated only on the basis of a multifactorial analysis of the impact of irrigation and economic factors in rice cultivation on its productivity. The object of research was a section of the Petrovsko-Anastasievskaya irrigation system in the Krasnodar Territory. The rice variety, the method of sowing, the depth of seed embedding, and the irrigation regime were selected as the variables. Crop rotation, fertilization, the role of irrigation regime in different phases of rice plant development, and a number of other factors were not considered at this stage of the research. The purpose of the research was to develop a methodology for calculating the optimal irrigation rate, which ensures the greatest economic effect from rice cultivation, considering the rice paddy fields flooding regime, varietal characteristics of the crop and the method of sowing in the Krasnodar Territory. To solve this problem, an Excel version of the software module was developed, which allows determining the irrigation rate and a set of the above-mentioned factors leading to the most cost-effective solution and appropriate design recommendations. The Pearson curve of type I with parameters selected based on field and laboratory research materials was adopted as the basic dependence of yield on irrigation rate. In the simulation mode, three operating factors are considered: the irrigation regime; the method of sowing rice, and the rice variety. The minimum set of scenarios left for modeling the situation was 18 variants, which led in the considered example to an irrigation rate of about 20 thousand m³/ha under conditions of combined irrigation of medium-ripened rice varieties. The direction of further research is related to the substantiation of basic dependence of yield on irrigation rate, the expansion of the number of influencing factors and the refinement of single cost indicators.

1. Barsukova G.N., Goverdovskaya M.D. Analysis of domestic and foreign experience of rice growing development / G.N. Barsukova, M.D. Goverdovskaya // International Journal of Applied Sciences and Technologies Integral. 2022. No. 4. DOI: 10.55186/02357801_2022_7_4_3. EDN: VYMMPJ

2. Balakay G.T. On the issue of developing norms for water demand for rice and water disposal from rice irrigation systems. / G.T. Balakay, L.M. Dokuchaeva, R.E. Yurkova // Russian Research Institute for Land Reclamation Problems, Novocherkassk, Russian Federation, Scientific Journal of the Russian Research Institute of Land Reclamation Problems No. 3(31), 2018, P. 1-22. DOI: 10.31774/2222-1816-2018-3-1-22 EDN: XWARKP

3. Isaeva S.D. Scientifically based recommendations for improving water use management in agriculture in the Lower Volga and Kuban River basins in the context of water resources deficit based on the use of modern information, analytical and digital technologies / S.D. Isaeva, E.B. Dedova, A.L. Buber // Scientific and technical achievements and developments of the Federal State Budgetary Scientific Institution “VNIIGiM named after A.N. Kostyakov” (2016-2021): Collection of Scientific Works. Moscow: All-Russian Research Institute of Hydraulic Engineering and Land Reclamation named after A.N. Kostyakov, 2021. P. 67-69. EDN: MSMHBQ

4. Ratkovich E.L. Theoretical approaches to optimization of water use on rice irrigation systems of the Lower Kuban / E.L. Ratkovich Yu.P. Dobrachev, A.A. Buber // Irrigated agriculture. 2022. № 2(37). P. 18-22. DOI: 10.35809/2618-8279-2022-2-2. EDN: GHHHRG

5. Ladatko V.A. The influence of rice straw incorporation methods on rice yield / V.A. Ladatko, M.A. Ladatko // Rice growing. 2019. No. 1(42). P. 32-36. EDN: MHEXNS

6. Taranenko V.V. Viability and yield of rice seeds under different methods of sowing and irrigation regimes in the conditions of ecologically safe technology: specialty 06.01.05 “Selection and seed production of agricultural plants”: abstract of the dissertation for the degree of candidate of agricultural sciences / Taranenko Viktor Vladimirovich. – Krasnodar, 2003. 24 p. EDN: NHKRKH

7. Shabanov Vitaly Vladimirovich. Substantiation of the need for land reclamation [Text]: Abstract of diss. for the scientific degree of doctor of technical sciences / Moscow. Hydromeliorative Institute, Moscow, 1969. 19 p.

8. Certificate of State Registration of the Database No 2023622929. Digital Information Basis of the Hydrodynamic Model of the Irrigation System Section (“IP Fomenko”, Krasnodar Territory): No 2023622694: application. 11.08.2023 / E.L. Ratkovich, A.A. Buber, F.A. Karakulov, S.A. Filippov; applicant: Federal State Budgetary Scientific Institution “All-Russian Research Institute of Hydraulic Engineering and Land Reclamation named after A.N. Kostyakov” (FSBI “VNIIGiM named after A.N. Kostyakov”). EDN: EAOVAC

9. Manzhina S.A. Modern approaches to determining the economically justified cost of water supply for irrigation / S.A. Manzhina, L.N. Medvedeva. Scientific journal of the Russian Research Institute of Land Reclamation Problems. 2018. № 3(31). P. 148-170. Available at: http: www.rosniipm-sm.ru/archive?n=556&id=566. DOI: 10.31774/2222-1816-2018-3-148-170.

10. Polutina T.N., Gubieva S.Y. Key trends and prospects for the development of rice growing in the Krasnodar region / T.N. Polutina S.Yu. Gubieva // Food Security: Problems and Ways of Solution: Collection of Articles on the Materials of the XVI International Scientific and Practical Conference, Krasnodar, June 03-05, 2021. Krasnodar: Kuban State Agrarian University named after I.T. Trubilin, 2021. Pp. 155-161. EDN: KPFEUU

11. Malysheva N.N. Economic aspects of rice production on reclamation systems of the Krasnodar region / N.N. Malysheva, S.V. Kizinek. Scientific Journal of the Russian Research Institute of Land Reclamation Problems. 2020. № 1(37). P. 200-216. DOI: 10.31774/2222-1816-2020-1-200-216. EDN: