Abstract
The purpose of the experiment was to study the influence of periodic using of neutralized phosphogypsum on the fertility of meadow chernozem soils of Krasnodar Territory, achieving of the appropriate level of rice agrocenosis productivity, and the quality of rice grain. The timing of the effective use of phosphogypsum as a phosphorus fertilizer was revealed during the experiment. It was proved that the same level of mobile phosphorus content in rice soils can be achieved by using either phosphogypsum or standard phosphorus-containing fertilizers. Given the fact that nitrogen and potassium fertilizers are already used, using of phosphogypsum provides an opportunity of getting a 6,34 tons/hectare yield of rice (the same result was achieved using N120P80K60 fertilizer). 3 years after re-fertilizing the soil with phosphogypsum we can notice that effectiveness of phosphogypsum in optimization of rice mineral nutrition program contributes to cost savings of 4155 RUB/hectare in comparison with traditional fertilizing system.
Highlights
The country’s sustainable development strategy in the agroecological sphere should be based on the saving and restoration of natural agroecosystems, stabilization and improvement of environmental quality, and implementation of recycling of industrial waste
The object of study are meadow chernozem soils of the Krasnodar Territory which were mainly formed on heavy alluvial deposits [11,12]
The soil is moderately provided with mobile forms of nitrogen, humus content in the arable layer of the soil is 3.26%, phosphorus content is 54.8 mg/kg, exchange potassium content is 328.5 mg/kg, exchange calcium content is 34.6 mEq/100g, pH w. 6.6 [13]
Summary
The country’s sustainable development strategy in the agroecological sphere should be based on the saving and restoration of natural agroecosystems, stabilization and improvement of environmental quality, and implementation of recycling of industrial waste (including phosphogypsum). Using of phosphogypsum is associated with the problem of rational use of natural resources. A lot of critical tasks can be solved, such as fuller use of raw materials, improvement of ecological situation in the region, economically and agronomically effective increase in soil fertility. The use of phosphogypsum is effective in various soil and climatic zones as the main fertilizer for the soil and the top-dressing for cereals, vegetables, technical crops and other crops. The use of phosphogypsum in rice cultivation can significantly improve the physicochemical properties of soils and their water-air and nutrition regimen. It can increase the calcium content in the soil absorption complex [1,2]
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