Effect of the irrigation regime of rise on soil oxidation-reduction status
During the cultivation of rice in the field for 3 months, the required water layer is maintained. In these conditions, there are the processes that lead to changes in the composition of organic and mineral components of the soil, namely: removal of easily soluble substances and mobile forms of nutrients, the dominance of reduction processes over oxidation ones. Irrigation of rice crops using drip irrigation also causes changes in salt and water-air regimes, which leads to the formation of salt bags and toxic salinization of the soil in a layer of 0-60 cm. The negative effect of drip irrigation is not so noticeable compared to flooding conditions and can be eliminated by observing crop rotation with the rate of the main crop not more than 50%.
The research was conducted during 2016-2020 in the territory of the Rice Institute of NAAS and its experimental farm (Skadovsk district, Kherson region), where the soil cover is represented by dark chestnut saline soil. The study of the effect of rice cultivation in flood conditions was carried out on a rice irrigation system with an area of 190 ha, and under drip irrigation - on a demonstration trail with an area of 4 ha. The oxidation-reduction status of the arable soil layer of rice crop rotations when rice growing, is seasonal. In the period of water layer maintaining in the field, in the arable layer reduction processes predominate, while after harvesting and checks draining the intensity of the reduction processes is moderate and decreases.
A model describing this process by the equation of a quadratic parabola was constructed. Growing rice under drip irrigation also reduces the oxidation-reduction soil capacity to negative values, but for a short period, which does not adversely affect the soil. The dynamics of this indicator in the conditions of drip irrigation is described by the equation of a quadratic parabola. Continuous monitoring of this process enables to evaluate the stability of fluctuations of the oxidation-reduction soil balance, which is important for assessing soil quality.
2. Romashchenko. M. I.. & Baliuk. S. A. (2000). Zroshennia zemel v Ukraini. Stan ta shliakhy polipshennia [Irrigation in Ukraine. State and ways to improve]. Kyiv: Svit. [in Ukrainian].
3. Romashchenko, M. I., Drachynska E. S., & Shevchenko, A. M. (2005). Informatsiine zabezpechennia zroshuvanoho zemlerobstva. Kontseptsiia, struktura, metodolohiia orhanizatsii [Information support of irrigated agriculture. Concept, structure, methodology of the organization]. Kyiv: Ahrarna nauka. [in Ukrainian].
4. Hutorova, O. A. (2020). Sovremennoe sostoianye plodorodyia pochv risovykh ahrolandshaftov Kubani i trend eho izmenenyia v protsesse selskokhoziaistvennoho ispolzovanyia [The current state of soil fertility of rice agrolandscapes of Kuban and the trend of its change in the process of agricultural use]. Doctor’s thesis. Krasnodar: Vserossyiskyi nauchno-yssledovatelskyi institut risa. [in Russian].
5. Hutorova, O. A., & Sheudzhen, A. N. (2016). Morfohenez rssovykh luhovo-bolotnykh pochv Kubani [Morphogenesis of rice meadow-swamp soils of Kuban]. Rossyiskaia selskokhoziaistvennaia nauka, 6, 25-27. [in Ukrainian].
6. Tronza, H. V., & Bashyrov, M. A. (2015). Evoliutsyia pochv risovyiykh ahrotsenozov sukhostepnoi zony Kryma [Evolution of rice agrocenoses soils of the dry steppe zone of Crimea]. Ahronomyia y lesnoe khoziaistvo, 5, 33-53. [in Russian].
7. Fugen, Dou, Junel, Soriano, Rodante E., Tabien, Kun, Chen. (2016). Soil texture and cultivar effects on rice (Oryza sativa, l.). Grain yield, yield components and water productivity in three water regimes. PLoS One, 11(3), e0150549. https://doi.org/10.1371/journal.pone.0150549
8. Tortyk, M. Y. (2014). Osoblyvosti zasolenosti hruntiv rysovykh system Odeshchyny [Features of salinity of rice systems soil of Odesa region]. Heopolityka ta esoreodynamika rehioniv, 5, 909-913. [in Ukrainian].
9. Edwards, J., Santos-Medellín, C., Nguyen, B., Kilmer, J., Liechty, Z., Veliz, E., Ni, J., Phillips, G., Sundaresan, V. (2019). Soil domestication by rice cultivation results in plant-soil feedback through shifts in soil microbiota. Genome Biol, 20, 221. https://genomebiology.biomedcentral.com/articles/10.1186/s13059-019-1825-x
10. Titkov, A. A. (2016). O vozmozhnom razvitii neblahopryiatnykh posledstvyi prekrashchenyia raboty Severo-Krymskoho kanala dlia Krymskoho rysoseianyia [About possible development of adverse consequences of the termination of work of the North Crimean channel for the Crimean rice growing]. Yzvestyia selskokhoziaistvennoi nauky, 7(170), 23-27. [in Russian].
11. Titkov, A. A., & Kol'cov, A. V. (1995). Vliyanie orosheniya zatopleniem na meliorativnyie usloviya i pochvennyiy pokrov Prisivashya [The effect of irrigation by flooding on reclamation conditions and soil cover of the Sivash region]. Simferopol. [in Russian].
12. . Stashuk, V. A. (Ed.), Rokochynskiy, A. M. (Ed.), & Hranovska, L. M. (Ed.) (2014). Rys v Ukraini [Rise in Ukraine]. Kherson: Hrin D.S. [in Ukrainian].
13. Orlov, D. S. (1992). Khimia pochv [Soil chemistry] Moskva: Yzd-vo MHU. [in Russian].
14. Zonn, S. V. (1982). Zhelezo v pochvakh (henetycheskie i heohraficheskie aspekty) [Iron in soils (genetic and geographical aspects)]. Moskva: Nauka. [in Russian].