Cherlinka V. Substantiation of Agroecological Conformity of Models of Soil Fertility and it Factors to the Crop's Requirements

The object of investigations - models of fertility, factors of fertility, relationship of the models of fertility and the basic laws of agriculture, connections among indices of soil properties and agro-klimate conditions according to agroecological crops' (winter wheat and sugar beet) requests. The aim of investigations - to determine appropriatenesses and dependences among the basic indices of soil and to carry out mathematical models of fertility and factors of fertility taking into accout the basic laws of agriculture and agroecological requements of the main crops. The methods of investigations - the carring out of a problem joined theoretical and generally known experimental researches on the system base. For creation of soil fertility а model and it agroecological estimation an elaboreted by us method with using a generalized index of soil fertility is applied. Physical, chemical and agrochemical analyses of soil is carried out according to attested methods, results is wrought up statistically.T he theoretical results - the generalized index of soil fertility (GLSF) and method for it calculation by normalizing of some soil fertility indices using polynomials of 3-4 power and their following averaging by average harmonic formula. On the base of GLSF the model of soil fertility according to basic laws of agriculture and agroecological requests of different crops is created. The practical results - recommendations for achievement of optimal soil indices and conditions using regression models of equilibrium density are carried out. It is proposed to use GLSF as the index for soil rating monitoring of lands in Ukraine. The novelty consists in determination of linear and non-linear dependences among indices of soil absorbing complex, humus content and equilibrium denstity of the main soils in Ukraine and in substantiation of the generalized index of soil fertility (GLSF). The rate of inculcation - in the teaching method based on lectures in section "Soil fertility" and for fulfilment of course and degreewo rks. The sphere - agriculture.