Our investigations are based on the property that the fields of sources, whose depths are numerically equal to survey heights, are most brightly presented in the data of magnetic survey. Therefore, the magnetic field created by the upper boundary of the magnetically active layer is well presented in the data of magnetic surveys (survey heights are up to the first kilometres), whereas the geomagnetic field of the centre mass is well presented in the data of gradient magnetic surveys at heights of 20-40 km. These data were used separately for the interpretation of the depths of the upper and lower boundaries of the lithospheric magnetically active layer by spectral methods. This fact is especially valuable for estimating the positions of deep sources. For the central part of the East European platform, we obtained by spectral methods, the following values: the depth of the upper boundary of the layer is 8.5 km and that of the lower boundary of the layer is 64.3 km. The discrete localisation of the source depths along the profile is performed by the methods of converting the initial information into transformed fields, continuation upward, and reduction to the pole with the determination of singular points. The Poisson integral, representing the solution of the outer Dirichlet problem for the plane, served as a theoretical base for such an interpretation. These approaches made it possible to determine more exactly the localisation of deep sources along the profile and showed that the published magnetic maps based on aeromagnetic data do not contain in full measure the fields of deep-seated magnetic sources.
The most important task in the sphere of agro-industrial complex management in the region is to identify new points of growth and competitive advantages of agricultural sectors, based on the rational use of available resources and minimization of the negative impact of factors constraining the development of production. An analysis of dynamics and distribution of grain crops production has shown that in view of development of industrial crops, the maintenance of stable grain production at the level of 2.7-3.0 million tons is possible due to intensification of grain and leguminous crops production and introduction of new high-yielding and demanded in the market agricultural crops into crop rotations. Intensification of grains and legumes production in Penza region must be based firstly on raising the sown areas sown with seeds of higher reproductions for providing of scientifically grounded varietal changes and variety renovation. The implementation of this task will be possible if a modern system of breeding and seed production of grain crops is established in the region. Preservation of soil fertility and reduction of the grain crop production cost can be achieved by reducing the application of nitrogen fertilizers and increasing the share of profitable leguminous crops, such as peas, lentils, and lupine, in the structure of crop rotations. Grain maize has a significant potential for diversification and increase in grain production, if agrotechnics, zoned and promising varieties and hybrids adapted to soil and climatic conditions of the region are introduced. Sustainable production of grain and leguminous crops in the region is impossible without modernization of existing and creation of new capacities on storage and processing of grain crops. Realization of complex of scientific-production and organizational-economic and program-targeted measures is of great importance.
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