The article discusses modern legal regulation of land monitoring and necessary changes in appropriate legislation. Land monitoring is divided into monitoring of land use and monitoring of land quality. The problem of land abandonment or non-use of land resources on the example of Samara region, where more than 75 % of territory is agricultural land has been studied. Inverse relationship between remoteness of local municipality from centre of the Samara-Togliatti agglomeration and area of unfarmed agricultural land has been analysed. Since the start of land reform, large areas of abandoned land have appeared in Samara region. The information on unfarmed agricultural land on municipal level of Samara region has been presented and the changes in their quality conditions are characterized. At federal level the program for prevention and elimination of land abandonment has been developed and implemented, the results of this program have been analysed. However, there are significant problems in monitoring of land conditions. It is proved that absence of single authority for land management on national level and fragmentation of this function across different federal ministries leads to uncoordinated actions and lack of reliable information about land quality. As result, land quality continues to deteriorate, degradation processes are going on. At municipal level there are no possibilities and necessary investigation materials for land management and monitoring. The following measures are proposed as main recommendations for solving land use and land abandonment problems: creation of single authority for land stock management, implementation of comprehensive inventory of land on municipal level, improvement of cadastral valuation system according updated materials and technologies, as well as certification of agricultural land for soil quality and properties. The purpose of the research was the study of results of land monitoring in Samara region for analysis of dynamics of land stock and identification of main reasons for formation of unused (abandoned) agricultural land in the region. It is proved that land stock of Samara region mainly consists of agricultural lands, and most part of them (60 %) are owned by citizens. Significant problem of land use is the availability of unused arable land, which is 8 % on average in the region, but in local municipalities it ranges from 0 % to 29 %. The highest proportion of unused arable land is located in areas closer to Samara-Togliatti agglomeration, where most of the land has been privatized by individuals for conversion to other land categories and further resale, as well as problems with uncontrolled urbanization there have been observed.

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The standard yield model recommended for land assessment and certification of land according to the degree of suitability for agricultural use is based on the assessment of agro-ecological potential (AP) as characteristics of the territory 's water and thermal resources. The quality check of the model according to the data of the class testing areas for the period 2007-2018 showed an overestimation of the standard grain yield for the conditions of the Saratov region by 1.2-1.5 times. The error is due to the use of the most available agro climatic parameters in the model, which establish their connection with productivity at the interregional level, but do not meet the conditions of adequate differentiation of conditions of moisture supply of crops at the regional level. Correction of the AP model, when using the parameters of water and thermal resources provision by the coefficients of annual moistening and the sum of biologically active temperatures, is achieved by reducing the AP level by 1.2 times and fixing the standard value of the climate continental index - 187. A new version of estimated zoning is proposed based on the corrected model of AP, at which the number of agro climatic subzones is reduced from 9 to 6. The adequacy of the assessment of land productivity is ensured by the use of AP parameters that are individual for municipal areas rather than medium-sized ones.

Проведена агропроизводственная оценка выявленных по итогам выполнения работ по созданию ГИС АПК Саратовской области в 2016 г. неиспользуемых участков пашни Дубковского МО Саратовского района. Для вовлечения неиспользуемых участков пашни в сельскохозяйственное производство практически на всех участках потребуется проведение землеустроительных работ, связанных с трансформацией угодий,-переводом низкоплодородных почв в состав пастбищ. Ключевые слова: пашня, почва, балл бонитета, удалённость, чистый доход, агропроизводственное зонирование.