A brief analysis of the current state of development of methods for the qualitative assessment of agricultural land. The basic scope of the possible results of soil evaluation. Revealed evidence of the influence of the nonlinear nature of the soil on yield. Analytically developed a formula taking into account the effect of the nonlinearity of soil attributes in the qualitative evaluation of land.

Keywords: diversification of management, production diversification, financial and economic purposes of a diversification, technological purposes of ensuring flexibility of production

To process and synthesize data set in order to determine the effect of organic matter, phosphorus, potassium, particle size distribution, acidity and the amount of absorbed bases sod-podzolic soils on the yield of different crops. Performed correlation and multiple regression analyzes.

Keywords: indicators of fertility, correlation, coefficient of determination, regression analysis, the non-linear nature of the impact, productivity, soil, agrochemical inspection, digital terrain model, modeling.