Relevance. The issues of reproduction of fertility of light gray forest soils of the forest-steppe zone and utilization of poultry industry waste as organic fertilizers are interrelated and are very relevant. Methods. The experiments studied the effect of one-time application of various doses (15, 30, 50 t/ha) of chicken manure, chicken manure compost and local organic fertilizers (sapropel and peat) on crop yields, and the aftereffect of fertilizers on the main indicators of soil fertility — amount of humus, nitrate nitrogen, phosphorus and potassium. The variants of the experiments were investigated sixfold. The Federal State Center of Agrochemical Service "Chuvashsky" was involved in laboratory analyses of soils and crop production. Mеthods of analysis of soil samples and crop production are generally accepted in agrochemical science.Results. Organic fertilizers for three years of research were introduced into the soil only once at the beginning of the experiment in doses of 15, 30 and 50 t/ha, and their effect on the yield and quality of crop production (potato tubers, spring wheat grains and peas) in 2020–2022 was positive. The agrochemical properties of the arable soil layer in the variants with the use of organic fertilizers have significantly improved. The nitrate content in the products in variants with doses of chicken manure and compost of 50 t/ha or more approached the critical level. Local fertilizers (sapropel and peat) at a dose of 30 t/ha, chicken manure and compost at a dose of 15 t/ha are good organic fertilizers with a long aftereffect.
The paper states that the research carried out during 2020-2021 revealed the optimal dose of sapropel application for agricultural crops in light grey forest soils, i.e., 30 t/ha. The combined use of sapropel and azofoska took the maximum direct effect and aftereffect in the variant (sapropel at a dose of 15 t/ha and azofoska at a dose of 200 kg/ha). The authors showed a positive role of sapropel not only as a source of plant nutrition elements but also as a stimulator of plant growth and development. The separate application of sapropel not only stimulates the development of cultivated plants but also increases the concentration of nutrients in the soil. However, it is insufficient to obtain high yields. The addition of azophoska to sapropel eliminates the lack of plant nutrients in the soil, as a result of which the maximum yield of agricultural crops is achieved. The use of fertilizers had a positive effect on the main indicators of soil fertility such as the content of organic matter, nitrogen, mobile phosphorus, exchangeable potassium in pH values of exchangeable acidity.
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