Ekaterina Petrovna Pakhnenko
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Effect of amorphous silicon dioxide of the behaviour of cadmium in the soil-rice plant systemMoscow University Bulletin. Series 17. Soil science. 2018. 1. p.40-45Dmitry M. Khomyakov Ekaterina P. Pakhnenko Vladimir V. Matychenkov Elena A. Bocharnikova Peng-bo Zang Xiao Weiread more366
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In field trials, the effect of amorphous silicon dioxide on the behavior of Cd in the soil- plant system in low Cd-contaminated flooded paddy soil was studied. The application of amorphous SiO2 resulted in 1,3—1,8 times reduced accumulation of Cd by aboveground organs of rice and 1,8—2,6 times reduced mobile forms of Cd in the soil, which can be explained by Cd sorption on the surface of applied silica or/and the interaction between Cd and monosilicic acid formed as a result of dissolution of SiO2. Reduction in the Cd mobility was more pronounced within first 2 weeks after SiO2 application. Amorphous silica increased rice yield by 26,6% in the first season and by 72,9% in the second season. The data received evidences the possibility to decrease the conventional mineral fertilizers application rates without risk of yield reduction by using Si-rich materials. They should become an integral and important part of the implementation of the 4R-STRATEGY of fertilizer application and plant nutrition optimization.Keywords: cadmium in soil and plants; monosilicic acid; rice harvest; 4R-STRATEGY for fertilizer application and plant nutrition optimization
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The evaluation of the carbon sequestration by rice roots under silicon fertilizationMoscow University Bulletin. Series 17. Soil science. 2019. 3. p.17-22Dan-dan Zao Peng-bo Zang Elena A. Bocharnikova Vladimir V. Matychenkov Dmitry M. Khomyakov Ekaterina P. Pakhnenkoread more359
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The problem of elaboration and implementation of innovative, feasible, ecologically friendly nature-like technologies aiming at an increase in carbon (C) stock and significant reduction in greenhouse gas (GG) emission from all agricultural areas, including those under rice cultivation, is critically important. In field tests conducted in Hunan Province, China, carbon dioxide (CO2) sequestration by roots of rice plants was evaluated as influenced by silicon (Si) fertilizers. The amount of additional CO2 sequestrated was dependent on the content of plant-available Si in agrochemicals, frequency and duration of their application and granulometric composition of soil. The data obtained evidences the potential of Si fertilizers to promote the process of C sequestration and reduction in GG emission under rice cultivation. Their application provided an increase in rice yield by 12,1 to 71,2% and in the CO2 fixation by root system by 0,95 to 14,9 t ha-1 over one season. Returning C to soil and fertility reproduction could be provided via enhanced plant root system development and increased root debris after harvesting. Agrochemicals containing silicon available for plants should be included in the technology for the implementation of 4R-STRATEGY of mineral nutrition of agricultural crops.
Keywords: silicon fertilizer; rice; greenhouse gases; carbon dioxide; "green" agricultural technology
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