Sulfur takes a worthy place among the nutrients that are required for crops for their well-being. It takes part in most important physiological processes such as photosynthesis and respirati on, carbohydrate metabolism, primary nitrogen assimilati on. Suffi cient supply of plants with sulfur is the main factor of obtaining good vegetable protein. The Agrochemical Service Stati on Ulyanovskaya , has conducted studies to determine the content of mobile sulfur in the soil, as part of integrated monitoring since 1994. This paper presents results of long-term examinati on of the content of mobile sulfur in agricultural lands of Ulyanovsk region. It is stated that more than 60% of agricultural land has low level of content of this element. The greatest amount of sulfur is found in arable soils of Novospasskiy District-6.04 mg / kg, Terengulskiy-6.62 mg / kg and Melekesskiy-6.70. Arable soils of these municipaliti es belong to a group with an average sulfur content. At the same ti me, for all types of agricultural land in the region in the period from 01.01.2005 to 01.01.2017, an increase in the proporti on of soils with a low content of mobile sulfur is typical: for soils of arable land and pastures by 1.2 ti mes, deposits-by 1.3 ti mes, hayfi elds-by 1.5 ti mes, perennial fi elds-by 1.9 ti mes and as a whole for agricultural lands-by 1.2 ti mes. In this connecti on, agricultural producers of the Ulyanovsk region need to pay att enti on to soil sulfur availability and to fi ll the defi ciency of this element by introducing sulfur-containing ferti lizers in the areas with its low content.
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