Scientific Journal of KubSAU

The main index of land fertility is a content of humus in soil. Soil researches of the last 40-50 years confirm the decrease of humus in Kuban black soils, reduction of humus horizon capacity. Land relations are realized in the process of agrarian production. It is necessary to develop the main trends of organizational-economic mechanism including the elements of market and state regulation for their improvement. There was offered a mechanism of distribution of state support of agrarian producers of the Krasnodar region allowing to stimulate the arrangements on increase of agricultural land fertility. Increasing the level of humus in soil on 0,1 % there was recommended to add more 20% from it to the calculated subsidies, on 0,2% - to add 40%, on 0,3%-60% and so on. These data on measurements will allow increasing the interest of land users in preservation and increase of fertility of agricultural lands. Agricultural soil fertility reproduction can be achieved at the expense of introduction of organic fertilizers as manure. At the reduction of livestock in agricultural organizations of the Krasnodar region one of the ways of compensation of soil fertility is a proper selection of agricultural crops in the crop rotation and securing of optimal structure of sowing areas. There was calculated an economic-mathematical model of linear programming allowing determining the optimal content of agricultural crops and sizes of sowing areas supplying with deficit-free balance of humus at more economic efficiency to obtain the yearly increased per hectare subsidies

The significance of humus content in soils of the Krasnodar region is decreased. Losses amount is 0,03- 0,05 % every year. The main means of preservation of soil fertility is the introduction of such organic fertilizers as manure. The availability of manure’s use has decreased significantly in connection with the reduction of livestock in agricultural organizations of the Krasnodar region. It causes the necessity of searching of other ways of replenishing of soil fertility. The challenge is to ensure a positive balance of organic matter in soil without application of manure. The reproduction of the soil fertility can be achieved at the expense of proper selection of agricultural cultivars in the crop rotation and provision of optimal structure of sown areas. The modeling of the structure of sown areas using the developed economic-mathematical model allows to determine the optimal composition and the areas of crops for maximum gross or net income with a positive balance of humus. It is proposed to use the general indicators of economic evaluation - gross or net income, increased (decreased) in the value added of (left) humus to assess the effectiveness of land use. The calculations were made on the example of the Ltd Company “Vorontsovskoe” of Dinskoy District, they may be adopted for any agricultural organization